JP3346372B2 - Functionally graded sealing material for lamps - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a xenon lamp,
The present invention relates to a sealing member made of a functionally gradient material for a lamp used for a lamp such as a halogen lamp.

[0002]

2. Description of the Related Art A functionally graded material is composed of a mixed sintered body of, for example, a conductive inorganic material component made of a metal and a non-conductive inorganic material component made of an oxide such as a metal. By the conductive inorganic substance component concentration changing stepwise or stepwise, a conductive part having a high conductive inorganic substance component concentration and a non-conductive part having a conductive inorganic substance component concentration of zero or a low concentration are formed. And a solid material located at different locations, and is suitably used, for example, as a sealing member for forming a current supply path in a configuration of a seal portion of a lamp.

When such a functionally graded material is actually used as a sealing member for a lamp, it is necessary to connect a lead rod to the functionally graded material in an electrically connected state. and functional materials through hole for the lead bar inserted in the stacking direction from the end surface provided with a bottomed hole for the lead bar insertion or inserting the lead pin is provided for example, by inserting one end of the lead rod into the bottomed hole This is achieved by fixing both.

The above-mentioned functionally graded material, for example, when a lead bar made of a metal such as tungsten is inserted into the through hole of the functionally graded material to be fixed, such as silica, for example, is used. The non-conductive inorganic substance may be fixed even in a region where the non-conductive inorganic substance exists at a high concentration, and cracks may be generated in a cooling stage after sintering due to a difference in coefficient of thermal expansion between the two.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a functionally graded material that does not crack in its manufacturing process.
A functionally graded sealing material for lamps that ensures high mechanical strength and does not break even when it is used as the final product.It is also easy to weld when sealing the lamp bulb. An object of the present invention is to provide a sealing member made of a functionally gradient material for a lamp, which also improves productivity.

In order to solve the above problem, for example, it is conceivable to provide a gap between the lead bar and the functionally graded material so that the gap does not come into contact in a region where the difference between the linear expansion coefficients is large. Japanese Patent Application Laid-Open No. 9-115484 discloses such a sealing member made of a functionally graded material. This technology is used when lighting a lamp sealed with a sealing member made of a functionally graded material, when the outer surface of a lead bar,
This is to prevent the functionally graded material from coming into contact with the inner surface of the through hole provided for the insertion of the lead rod, thereby preventing the functionally graded material from cracking due to the difference in linear expansion coefficient. There is described a structure in which a gap is provided between a through hole for inserting a lead rod made of a functionally graded material and a lead rod by increasing the inner diameter of the through hole.

However, this technique is a technique for preventing cracks when the lamp is used for lighting, and since there is no idea to prevent cracks generated during cooling after sintering the functionally graded material, the graded function is not used. It is not mentioned in which region of the material the lead rod should be fixed, and it was impossible to prevent the problem of the present invention, that is, cracks generated during the production of a functionally graded material.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a conductive inorganic material powder and a non-conductive inorganic material powder.
And sintered body of powder compact formed by laminating these mixed powders
And the non-conductive inorganic substance and the conductive inorganic substance
Quality, one is non-conductive and the other is conductive
From the conductive inorganic material component toward the other
Functionally graded material that is laminated so that
Material and a through hole formed in this functionally graded material.
In the conductive region of the functionally graded material in an airtight state.
Consists of a single, tightly secured lead rod
A sealing member made of a functionally gradient material for a lamp, comprising:
Is the lead rod a non-conductive side end face of the functionally graded material?
Protrudes to form the internal lead and the conductive side end face
And a conductive inorganic substance component concentration at a bonding start point on the non-conductive side between the functionally graded material and the lead bar is 0.6 Vol% or more.
It is characterized by being 9 Vol% or less.

According to a second aspect of the present invention, the through- hole has a cylindrical shape whose diameter is enlarged on the non-conductive side, and the inner diameter of the enlarged cylindrical through- hole is C, and the diameter of the lead rod is large. When the outside diameter is d and the outside diameter of the functionally graded material is D, in the region from the non-conductive side end face of the functionally graded material to the starting point of fixing to the lead bar, the internal diameter C of the through hole is 1.
It is characterized by satisfying 2d ≦ C ≦ 0.6D.

According to a third aspect of the present invention, the through- hole other than the non-conductive portion of the functionally gradient material with the lead bar is tapered from the starting point of the fixed portion toward the non-conductive side. The thickness on the non-conductive side from the fixing starting point is
It is characterized in that it is thinner than the wall thickness at the fixing starting point. According to a fourth aspect of the present invention, the outer diameter of the non-conductive side end face of the functionally graded material and the vicinity thereof is defined as the fixed part starting point .
It is characterized in that it is made smaller with respect to the outer diameter to be set.

[0011]

For example, if the gap between the lead rod insertion through hole provided in the functionally graded material and the lead rod is small in the length direction of the lead rod, the lead rod and the functionally graded material are fixed on the non-conductive side. Since the starting point is a high-concentration region of the non-conductive inorganic substance component, cracks occur in the functionally graded material in the cooling stage after the main sintering. Conversely, if the gap is too large in the length direction, the mechanical strength of the sealing member at the portion where the functionally graded material and the lead rod are fixed will be reduced, and a person will accidentally touch the functionally graded material. When the sealing member is pressed when the lamp sealing portion is fixed with the base or when the lamp sealing portion is fixed by the base, the lamp sealing portion is broken.

However, in view of the above-described problem, if the inner diameter of the through hole for inserting the lead rod is reduced to provide a narrow gap between the lead rod and the functionally graded material, the inclination of the functionally graded material during the main sintering is reduced. While the functional material is greatly shrunk by shrinkage, the lead rod inserted into the through hole thermally expands, so that the functionally graded material comes into contact with the lead rod in the high-concentration region of the non-conductive inorganic substance to cause cracks. When the inner diameter of the lead rod insertion through-hole is increased, the thickness of the functionally gradient material is too small to be handled in the work process before the main sintering, and the functionally gradient material may be damaged. Further, even after the sealing member is formed, in a subsequent manufacturing process, for example, when sealing the lamp member made of silica by welding, there is a problem at the time of lamp manufacturing such that the sealing portion is too thin and the sealing member is deformed. Also invite.

Contrary to the above problem, however, when the through hole for inserting the lead rod is enlarged in the radial direction and the thickness of the sealing portion of the sealing member is reduced, the heat capacity of the sealing portion is small and the valve sealing portion cannot be closed. It may be advantageous for a complete seal.

The first invention of the present application is to provide a functionally graded material having a conductive inorganic substance component concentration of 0.6 Vol% or more at the starting point of fixing the lead rod on the non-conductive side, so that it can be cooled at the time of cooling after the main sintering. In this case, cracks can be prevented from occurring in the functionally graded material, and by setting the content to 39 Vol% or less, handling is easy even during the production of the functionally graded material, and the final product has sufficient mechanical strength. Thus, a highly reliable sealing member can be obtained.

According to a second aspect of the present invention, a through hole formed in the laminating direction of the functionally graded material has a cylindrical shape whose diameter is enlarged. Where d is the outer diameter of the functionally graded material and D is the outer diameter of the functionally graded material, in the region from the non-conductive side end face to the starting point of the lead rod fixation, the inner diameter C of the through hole is 1.2d or more. By doing so, even if the lead rod thermally expands when exposed to a high temperature, it does not come into contact with the inner peripheral surface of the functionally graded material, and the inner diameter C of the through hole is set to 0.6D or less. The sealing member does not deform when sealing the valve without being damaged during manufacturing.

Further, according to the third and fourth aspects of the present invention, the sealing process can be facilitated and the sealing of the valve sealing portion can be completely performed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory cross-sectional view showing an example of a sealing member made of a functionally gradient material for a lamp of the present invention.
This sealing member 20 made of a functionally gradient material for lamps (hereinafter simply referred to as a sealing member) is provided with a through hole 25 for inserting an electrode rod in the functionally gradient material 21, and a lead rod 11 extending in the longitudinal direction is provided. In a penetrated state, it is fixed and held on the functionally graded material 21. The diameter of the through hole 25 is increased on the valve 10 side.

The functionally graded material 21 is composed of, for example, a non-conductive material and a plurality of mixture layers formed on the non-conductive material and formed of a uniform mixture of the non-conductive material and the conductive material. The layers are stacked in a state where the conductivity increases continuously or stepwise as going in one specific direction. The sealing member 20 made of the functionally graded material 21 and the lead rod 11 has a broken line on the high-concentration side of the non-conductive inorganic substance located on the inside (left side in the drawing), that is, on the outer periphery of the non-conductive side. The sealing portion of the bulb 10 is hermetically welded to form a sealing structure.

Here, specific examples of the non-conductive inorganic substance that can be selected include silica glass, quartz, alumina, zirconia, magnesia, silicon carbide, and the like.
Titanium carbide, silicon nitride, aluminum oxynitride and the like can be mentioned, and among them, silica glass is suitably used. Specific examples of the conductive inorganic substance include, for example, molybdenum, nickel, tungsten, tantalum, chromium, platinum, zirconium, and the like. Of these, molybdenum is preferably used.

In FIG . 1, the lead rod 11 has, for example, an outer diameter.
Consists of φ1 to φ8 tungsten rods, functionally graded material
21 protrudes from the non-conductive side end face 22 at one end and extends
From the internal lead portion 12 and the other end surface 23 on the conductive side.
The external lead portion 13 extending and protruding is integrally formed.
I have. And the tip of the inner lead 12 of the lead rod 11
Has an electrode coil 14 made of, for example, a tungsten wire.
It is wound to form a discharge electrode. Thus, inside
And the external leads 12 and 13 are composed of one lead rod.
When it is formed, the conduction is good and a large current can flow,
Suitable.

A dry process is used to produce this functionally graded material. Specifically, a molding member for forming a through hole of the through hole 25 for inserting the lead rod 11 is filled with a non-conductive inorganic material powder in a molding die provided on a bottom member, and the non-conductive inorganic material powder is filled. A layer is formed, and a conductive inorganic substance powder and a non-conductive inorganic substance powder are mixed at different proportions. The mixed powder is filled in layers in a mold in order from a low mixed powder to form a powder laminate. Pressure is applied by the pressing member, whereby a cylindrical laminated molded body that is a pressure molded body is formed. The through hole 25 for inserting the lead rod 11 provided in the press-formed body is formed such that the concentration of the conductive inorganic substance is 0.6 Vol% when the final shape is obtained from the end face on the high concentration side of the non-conductive inorganic substance powder. The bonding starting point 2 between the functionally graded material 21 and the lead rod 11 which is equal to or more than 39 Vol% or less.
The inner diameter of the through-hole 25 is formed to be large up to 6, for example, by using the molding member for forming the through-hole 25 having a predetermined shape and simultaneously applying pressure to the press-molded body. It can be implemented by a method or a method of forming a press-formed body, and then cutting and providing the inside of the through hole 25 for inserting a lead rod.

Subsequently, the functionally graded material 21 made of the press-molded body obtained as described above is inserted into the through-hole 25 through the lead rod 11 and then placed in a non-oxidizing gas atmosphere.
Pre-sintering is performed at a temperature of about 1200 ° C. for about 30 minutes.
Furthermore, the main sintering of the functionally graded material 21 is performed by heating at a temperature higher than the above-mentioned temporary sintering process temperature. In this sintering, the gradient functional material of the temporary sintered body is, for example, 1720 to
It is performed by heating in a temperature range of 1750 ° C. for about 10 to 15 minutes. As a result, the functionally graded material 21 shrinks at the same time as becoming a sintered body, and the through-hole 25 is sintered,
The lead rod 11 is fixed to and integrated with the functionally graded material 21.

In the functionally graded material 21, the concentration of the conductive inorganic substance at the starting point 26 at which the functionally graded material is fixed to the lead bar 11 on the non-conductive side is in the range of 0.6 to 39% by volume. A gap 24 is formed from the conductive side end face 22 to the fixing starting point 26 so as not to contact the inner surface of the through hole 25.

According to the first aspect of the present invention, the functionally graded material 2
After the lead rod 11 is inserted through the main rod 1 and the main sintering is performed, cracks caused by a difference in thermal expansion coefficient between the two in a cooling process can also be prevented. And since the functionally graded material 21 also secures the mechanical strength, a person
It is durable and hard to break even if it is touched by mistake or if it is pressed when fixing it with a lamp base or the like.

In the second invention of the present application, the through hole 25 for inserting the lead rod has a cylindrical shape whose diameter is enlarged.
Is the outer diameter of d and the outer diameter of the functionally graded material 21 is D, the region from the non-conductive side end face 22 to the starting point 26 for fixing to the lead rod 11 (that is, the range of L in FIG. )
Satisfy 1.2d ≦ C ≦ 0.6D. According to the second invention of this application, the functionally gradient material 2 is used in the sintering step.
1 is contracted and the lead rod 11 is thermally expanded,
4 is sufficient, so that they do not come into contact with each other even at a high temperature, and cracks during the main sintering can be prevented.
And even when it is desired to increase the inner diameter of the through-hole 25, the sealing member 20 of the present invention can easily perform the hole processing at the time of manufacturing, and has good productivity. It will be secured. Further, even when the sealing member 20 according to the second invention of the present application is sealed to a lamp bulb, the thickness of the sealing portion of the functionally gradient material 21 is too small to be deformed. There is no possibility that the high-concentration portion of the conductive inorganic substance contacts the lead rod 11 to cause cracks.

Further, the sealing member 20 made of a functionally graded material for a lamp according to the first invention of the present application comprises a functionally graded material 21.
Various shapes can be implemented for the shape of the through hole 25 for inserting the lead rod. For example, FIG.
(D) is conceivable. FIG. 3 is a longitudinal sectional view of the sealing member 20. In (a) and (c) of FIG. 2, the through-hole other than the fixed portion of the functionally gradient material with the lead bar on the non-conductive side expands in a tapered shape from the starting point of the fixed portion toward the non-conductive side. And a tilt function on the non-conductive side from the point of attachment.
The thickness of the material is smaller than the thickness at the starting point of fixing. As shown in FIG.
By increasing the inner diameter of the opening of the through-hole 25 gradually or stepwise toward the non-conductive side in various ways, various embodiments can be considered, and the embodiment is limited to that of FIG. Needless to say, it can be appropriately changed without any modification. Further, the non-conductive side end face 22
The shape of the opening of the through hole 25 can be variously changed, and the edge of the opening may be smooth or tapered, and may be rounded, though not shown.

In the above embodiment, the functionally graded material 21
On the non-conductive side (the left side in the figure) from the starting point 26 where the lead rod 11 is fixed, there is a gap 24 that is not in contact with the two. The thickness of the functionally gradient material 21 on the conductive side is reduced. According to such an embodiment, the heat capacity of the non-conductive side of the sealing member 20, that is, the sealing portion is reduced, so that welding to the bulb can be easily performed, and thus the lamp can be reliably sealed. .

Next, another embodiment of the sealing member 20 made of a functionally gradient material for a lamp according to the second invention of the present application is shown in FIG.
(A) to (e). (B), (c), (d) of FIG.
In (2), the outer diameter of the non-conductive side end surface of the functionally graded material and the vicinity thereof is smaller than the starting point of the fixing portion with the lead rod. And the thickness of the part becomes thin because the outer diameter is small. In addition, this invention is not limited to the shape shown in FIG.
It can be changed as appropriate, and the edge of the opening of the gap 24 may be smooth, tapered, or rounded.

FIG. 3 is a longitudinal sectional view of the non-conductive side of the sealing member 20. As shown in the figure, it is preferable to reduce the thickness of the non-conductive side of the functionally gradient material 21 because the sealing of the valve 10 can be easily and completely performed for the same reason as described above. In addition, it is also possible to seal such a sealing member 20 to a bulb using, for example, frit glass. For example, a gap 2 as shown in FIGS.
If the peripheral shape of the opening 4 is stepped,
If the stepped portion of the sealing member 20 is inserted into the tube of the valve, the positioning of the tip of the electrode can be facilitated.

Embodiment 1 Hereinafter, a specific embodiment of the present invention will be described. The functionally gradient material is silica glass (S
iO2) and molybdenum (Mo) as a conductive material
It was manufactured using. First, mixed powders of 12 kinds of silica glass-molybdenum having different mixing ratios were put into a molding die in which a molding member for forming a through hole for inserting a lead rod and a molding member for forming a gap were provided on a bottom member. First, the silica glass powder of the first layer is filled, and then the mixed powder of silica glass-molybdenum having a different content of molybdenum mixed is filled into the mold in a layered manner in order from the mixed powder having the lowest molybdenum concentration, A powder laminate of the silica glass-molybdenum mixed powder is formed. The final twelfth layer has a molybdenum concentration of 55 vol%. FIG. 4 is a table showing the silica glass-molybdenum concentration for each layer of the functionally gradient material and the thickness of each layer.

A powder compact was manufactured by applying a pressure of 1.176 × 10 ⁷ Pa to the powder laminate comprising the mixed powder from the outside.

On the high-concentration side of the silica glass powder of the powder compact, for example, press molding using a molding die or cutting the powder compact obtained by the above press molding, The size of the inner diameter of the through hole for inserting the lead rod was changed to provide a gap where the lead rod did not contact the inner surface of the through hole of the powder compact. Further, powder compacts were manufactured by changing the depths of the gaps in various ways, and powder compacts having different molybdenum concentrations at the starting points where the lead rod and the functionally graded material were fixed were obtained.

In this embodiment, a lead rod made of a tungsten rod having an outer diameter of φ4 is inserted into the through hole for inserting the lead rod, and is held in a hydrogen stream at 1200 ° C. for about 30 minutes to perform preliminary sintering. went. Subsequently, the sample piece was coated with an organic solvent containing silica glass as an oxidation-resistant coating, placed in a sintering furnace, and maintained at 1720 to 1750 ° C. for 10 to 15 minutes to perform main sintering.

Further, as a comparative sample piece in addition to the powder compact, a conventional sealing member having no gap between the functionally graded material and the lead rod was manufactured. This comparative sample piece
Except that no gap is provided, the material and the shape are manufactured in substantially the same manner as in the sample piece of the above-described embodiment.

Subsequently, the mechanical strength of the obtained sample piece at the portion where the functionally graded material was fixed to the lead rod was verified. According to the configuration shown in FIG. 5, a load of 98 N was applied to the external lead portion 13 in a direction perpendicular to the line axis, and cracks, cracks, chips, and the like were not visually observed and verified on the functionally graded material.

FIG. 6 shows the results of this embodiment. FIG. 3A is a schematic view showing an example of a sample piece used in the present example, and FIG. 3B collectively shows the results of the present example. In FIG. 6B, the abscissa indicates the inner diameter C of the through hole for inserting the lead rod, which is a gap between the non-conductive side end surface and the starting point where the functionally graded material and the lead rod are fixed, The vertical axis represents the depth L of the gap from the non-conductive side end face to the starting point of fixation, expressed by the molybdenum volume concentration (Vol%) of the functionally graded material. The outer diameter D of the functionally graded material of this embodiment is φ16.
It is.

The points marked with “「 ”,“ △ ”, and“ × ”in the same figure are the starting points of the fixation of the functionally graded material and the lead rod from the non-conductive side end face of the sample piece of this embodiment. Up to the inner diameter C and the depth L of the through hole. The sealing member of the sample piece according to this embodiment has an inner diameter C for inserting a lead rod of φ4.6, φ4 .4 from the silica glass side end surface to the lead rod fixing starting point (that is, the range of L). 8,
There are five types, φ7.6, φ9.6, and φ12.
(Mm).

In the same figure, for example, a sample piece whose inner diameter C of the through hole from the non-conductive side end face to the starting point of fixing of the functionally graded material and the lead rod is φ4.8 is fixed from the non-conductive side end face to the above-mentioned fixed state. This shows that a total of five different depths L to the starting point were manufactured, and the volume concentration of molybdenum at the starting point of the lead rod fixation of these specimens was 55 Vo from the above point.
1%, 39Vol%, 13Vol%, 2.3Vol%,
0.6% by volume and 0% by volume. The points of L = 0 (mm) and C = φ4 represent a comparative sample piece in which no gap is provided between the functionally graded material and the lead bar.

The notation “○, Δ, ×” at each point indicates the evaluation of each sample piece as a sealing member of the final product, and has the following contents. "O" is a sample piece that has no crack and has mechanical strength without breakage even in a bending test, and represents a sample that can be suitably used as a sealing member. "△" is either a sample piece that has cracked cracks in the main sintering, or a sample piece that has cracks in the bending test after the main sintering and has not secured mechanical strength. Yes, it represents a material that could be processed into the final shape but could not be used as a sealing member. “×” indicates either a sample piece that was damaged during handling in the manufacturing stage of the functionally graded material, or a sample piece in which the functionally graded material was cracked in the main sintering step, which could not be processed into the final shape. It shows.

In the comparative sample, since the functionally graded material cracked in the main sintering stage and could not be formed into the final shape, only the corresponding points of L = 0 and C = 4 were represented by "x". However, according to this result, L = 0 (or C = d
) Is understood to be unmanufacturable.

The test pieces marked with “○” in the above examples were actually sealed to the lamp bulb by welding, and it was confirmed whether or not the sealing member was deformed in the sealing process. The lamp bulb is made of silica glass glass, the outer diameter of the side tube portion is φ22.7, and the wall thickness of the tube portion is 2.35.
mm. As a result, none of the sample pieces was deformed at all, and the sample pieces were completely sealed to the lamp bulb. Therefore, it is understood that the sample pieces marked with “○” can be suitably used as a sealing member.

According to the results of the above example, when the concentration of the conductive inorganic substance component at the starting point of the lead-glued sticking on the silica glass side of the functionally graded material is lower than 0.6 Vol%, the gradient in the cooling process after the main sintering is increased. Cracks have occurred in the functional material. And the conductive inorganic substance component is 39V
Attempting to fix the lead bar to the functionally graded material in a concentration region higher than ol% resulted in a decrease in the strength of the portion where the lead bar and the functionally graded material were fixed, resulting in breakage during the bending test.

Therefore, the starting point of fixing the functionally graded material and the lead rod on the silica glass side is set to a portion where the concentration of the conductive inorganic substance component of the functionally graded material is 0.6 Vol% or more and 39 Vol% or less. Easy and productive,
It is understood that a sealing member made of a functionally graded material for lamps, which has sufficient mechanical strength and is suitable for practical use, can be obtained.

In this embodiment, the inner diameter of the through-hole is formed larger than the outer diameter of the lead rod from the non-conductive side end surface to the starting point of fixing of the functionally graded material and the lead rod to form a stepped structure. . A specimen having an inner diameter C (hereinafter simply referred to as an inner diameter of a through hole) of φ4.6 of the through hole has a gap between the functionally graded material and the lead rod with respect to an outer diameter of the lead rod d of φ4. Was too small to cause cracks due to contact during the main sintering, but no such cracks were observed in the sample piece provided with an inner diameter C of the through-hole of φ4.8 or more. However, a sample piece having an inner diameter C that is too large, specifically, an outer diameter D = φ16 of the functionally graded material and an inner diameter C = φ12 of the through-hole, has a thickness up to the starting point of attachment to the lead rod. The powder was too thin and was damaged during handling of the powder compact. The sample piece in which the inner diameter C of the through hole was smaller than that, for example, the inner diameter C = φ9.6, was easy to handle the powder compact, was not damaged, and could be used as a sealing member. Furthermore, this sealing member was a suitable sealing member without deforming the sealing member even when sealing it with a valve. Therefore, the inner diameter C of the through hole is 1.2 times or more the outer diameter d of the lead rod, and the outer diameter D of the functionally graded material.
It is understood that a member having a range of 0.6 times or less of the above is a sealing member made of a functionally graded material for lamps which has good productivity and is suitable for use.

Subsequently, the dimensions of the functionally graded material and the lead rod were changed to produce a sealing member made of a functionally graded material for lamps according to the present invention. The outer diameter D of the functionally graded material, the outer diameter d of the lead rod, the concentration of the conductive material at the starting point of fixing the functionally graded material to the non-conductive side of the lead rod, and the inner diameter C of the through hole were changed. The composition of the functionally graded material and the material of the lead rod are the same as in Example 1, and
In the same manner, a sealing member made of a functionally graded material was manufactured. The productivity, the presence or absence of cracks, the mechanical strength, etc. of the sealing member were evaluated. The results are summarized in the table of FIG.

[0046]

According to the first aspect of the present invention, even in a cooling step in which a lead rod and a functionally graded material are sintered, cracks do not occur in the functionally graded material, and the tilting function for a lamp has good productivity. A sealing member made of a material can be used. [2] According to the second invention of the present application, even when the functionally graded material is formed into a powder compact, it is easy to handle without being damaged by handling, and even when exposed to high temperatures during sintering, it comes into contact with the lead rod. Thus, a sealing member made of a functionally gradient material for lamps having good productivity can be obtained without causing cracks.
Further, it is possible to provide a sealing member made of a functionally graded material for lamps, which can be completely sealed without deformation of the sealing member even when welded to the lamp bulb. [3] According to the third and fourth inventions of the present application, when the non-conductive inorganic material side is formed thinner than the conductive inorganic material side, the sealing member and the valve can be easily welded in the sealing step. Become.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an example of a sealing member made of a functionally gradient material for a lamp of the present invention.

FIG. 2 is an explanatory sectional view showing another example of the sealing member made of a functionally gradient material for a lamp of the first invention of the present application.

FIG. 3 is an explanatory cross-sectional view showing another example of the sealing member made of a functionally gradient material for a lamp according to the second invention of the present application.

FIG. 4 is a table showing silica glass-molybdenum concentration and thickness of each layer.

FIG. 5 is an explanatory diagram of a bending test of a sealing member in the present embodiment.

FIG. 6 is a diagram collectively showing the evaluation of the explanatory sample pieces in Example 1 and the evaluation of each sample piece in Example 1.

FIG. 7 is a table showing the results of Examples 2 to 5.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Valve 11 Lead bar 12 Internal lead part 13 External lead part 14 Electrode coil 20 Sealing member 21 Functionally graded material 22 Non-conductive side end surface 23 Conductive side end surface 24 Gap 25 Through hole 26 Fixing origin

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-172514 (JP, A) JP-A-10-40867 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 61/36

Claims (4)

(57) [Claims] 1. A conductive inorganic substance powder, a non-conductive inorganic substance
Sintering of powders and powder compacts in which
A non-conductive inorganic material
Mechanical material, one is non-conductive and the other is conductive,
Conductive inorganic substance components from one side to the other
Machines that are stacked so that the ratio of
Functional material and a through hole formed in the functionally graded material,
Airtight sealing in the conductive region of functionally graded material
Is one lead rod secured to the lamp for FGM made sealing member formed is composed of
A is, the lead bar, or non-conductive end face of the FGM
Protrudes to form the internal lead and the conductive side end face
And an external lead portion protruding from the non-conductive side of the functionally graded material and the lead bar.
The concentration of the conductive inorganic substance component at the starting point of fixation is 0.6 Vo
A sealing member made of a functionally graded material for lamps, which is not less than 1% and not more than 39Vol%. 2. The through hole has a cylindrical shape whose diameter is increased on the non-conductive side, the inner diameter of the expanded cylindrical through hole is C, the outer diameter of the lead rod is d, and the inclination is When the outer diameter of the functional material is D, the inner diameter C of the through hole is 1.2d ≦ C ≦ 0.6D in the region from the non-conductive side end surface of the functionally graded material to the starting point of attachment to the lead rod. The sealing member made of a functionally graded material for a lamp according to claim 1, wherein the following conditions are satisfied. 3. A through hole other than the non-conductive fixing portion of the functionally gradient material with the lead bar is tapered from the fixing portion starting point toward the non-conductive side, and the fixing starting point is formed. The sealing member made of a functionally gradient material for a lamp according to claim 1, wherein a thickness of the non-conductive side is smaller than a thickness at the fixing starting point. 4. The outer diameter of the non-conductive side end face of the functionally graded material and the vicinity thereof in the vicinity of the fixed part starting point .
The sealing member made of a functionally gradient material for a lamp according to claim 2, wherein the sealing member is made smaller with respect to the diameter .