JPS59205406A - Preparation of connector of ceramics and metal - Google Patents

Abstract

PURPOSE:To enhance yield by preventing damage due to heat shock, by simultaneously performing the shrinkage fit or welding of ceramics and a metal during the sintering of a metal powder molded body. CONSTITUTION:A metal powder is subjected to press molding to prepare a preform 22 which is, in turn, set up around a ceramics sintered body 21 so as to leave a slight gap 13 from the outer periphery of said sintered body 21. This composite is sintered in a reductive atmosphere and shrinkage fit or welding is simultaneously performed to obtain a connector wherein compression force is added to ceramics. By this method, ceramics is prevented from rapid heating or quenching and damage due to heat shock is prevented while yield is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of shrink-fitting and reinforcing ceramics with metal, and more specifically, the present invention relates to a method of shrink-fitting and reinforcing ceramics with metal. The present invention relates to a method for manufacturing a bonded body.

Ceramics generally have excellent heat resistance, mechanical strength at high temperatures, wear resistance, or high insulation properties, and are therefore suitable as members used under severe conditions. However, the tensile strength of ceramics is generally lower than its compressive strength, so when used in mechanical parts, ceramics must be integrated with metal by shrink-fitting or press-fitting. A method of joining and reinforcing is used.

With these methods, relatively good results can be obtained in terms of workability and yield when the items to be joined are large items, but when shrink fitting or press fitting small items, the shrink fitting allowance for the items is small;
In addition, operations such as positioning were difficult, resulting in poor workability and yield, making it unsuitable for mass production.

Also, the coefficient of thermal expansion is 11.4X10-6 from room temperature to 800℃.
/°C, high z r o2 ceramics and thermal conductivity as high as 0.065 Cal/(, sec ・'C) AI, O, ceramics, etc., are prone to tearing and separation when joined by the shrink fit method. It was not suitable for this purpose.

The present invention was discovered as a result of intensive research in order to solve the above-mentioned problems. , during the sintering of the metal powder compact, shrink fitting or fusion is also performed at the same time in line 7. It is characterized by being a bonded body made by applying compressive force to laminox.

The method for manufacturing the bonded body of the present invention is, for example, a cylindrical ceramic outer periphery! 52. Loosely fit metal powder molded into a ring with dimensions that take into account the gap between the young kings. Next, the temperature of the furnace is increased to sinter the metal.

Since metal increases in density and undergoes thermal expansion as sintering progresses, the gap between the ceramic and metal is maintained until the maximum sintering temperature is exceeded. By leaving an appropriate gap between the NARAMIX outer wall and the sintered metal in the high temperature state where sintering is completed, the metal can be sintered in a satisfactory state. During this cooling process, the metal contracts and comes into close contact with the ceramics, and is sequentially tightened, applying compressive force to the ceramics.

In another method, a preformed metal powder is loosely fitted around the outer periphery of the ceramic, the outer periphery is surrounded by a mold made of refractory material, the temperature is raised to the melting point of the metal, and then the outer periphery of the ceramic and the mold are heated. After melting the metal between -C and cooling, it is possible to obtain a joined body to which a compressive force is applied.

In the manufacturing method of these joined bodies, good products can be obtained as long as the coefficient of thermal expansion of the metal used is larger than that of the ceramic, for example, the coefficient of thermal expansion is between room temperature and 800°C.
313N cow with 2.9 XIO/”C or 8.4 xlO
For ceramics such as At =/℃, 03, it is 15
Metals such as Fe of Metals such as "c" Ausdenai I-stainless steel and 23 x 10 ""/'c A1 can be used.

In the joined body of the present invention created as described above, compressive force was evenly applied even to human parts and small parts, and a shrink-fit or fusion-bonded product with good adhesion was obtained. In addition, for small IB products, the desired gap between the ceramic and the metal powder molded body can be easily achieved by simply selecting the molding die dimensions, and operations such as positioning are relatively easy to perform, making it suitable for mass production. It was something.

In addition, in the method of the present invention, since shrink fitting or fusion is simultaneously performed during sintering of the metal powder compact, the ceramisotin is not rapidly heated or cooled, resulting in good yields without loss due to thermal shock (no island formation). and the joints were no longer seen to loosen during use.

The method for manufacturing the bonded body of the present invention is to heat-fit or fuse a cylindrical or spherical cylindrical Cefmix sintered body with a metal.
It is suitable for engine-related parts, mechanical rotation-related parts, and other parts used under severe conditions F.

Hereinafter, embodiments of the present invention will be described in accordance with the drawings, but the present invention is not limited thereto within the scope of the gist of the present invention.

Example 1 Fig. 1 is a perspective view showing the outer wall of a cylindrical ceramic body being shrink-fitted at the same time as the metal powder molded body is sintered. Figure B shows the sintered shape after sintering and cooling.
0 outer 1-￥304'am, inner 1 ray 24Φ fin A 120
3 Sinter a compact 2 of iron-carbon-copper thread sintered metal powder (C0.8% or less, Cu 5% or less, remaining 1% or less) on the outer wall of the Cefmix sintered body 1, The case of creating a joined body of a dragon with an outer diameter of 36φ will be described.

Density: 6.11 g/cJ (17) When the compact of the above iron-carbon-copper metal powder is sintered at 1150'c, the length is 2.
% shrinkage and a density of 6.6 g/cd is obtained. Also, the thermal expansion coefficient of A1zo3 ceramics is 8.4 xiO'
/'c, the sintered metal is 15XIO/''C, and the difference in thermal expansion is 0.22x.

Therefore, the outer diameter is 36.7Φ and the inner diameter is 30.54Φ, and the dragon height is 21.
．． A gap 3 of 0.27 volts was installed on the above-mentioned iron-carbon-copper thread metal powder and the temperature was raised to 300'.
It was sintered at 1150° C. in a hydrogen atmosphere at c/11+r. Upon completion of sintering at 50℃, the gap becomes 0.075 mm, and during the cooling process, the gap size gradually decreases to about 35 mm.
At 0"C, the gap size becomes 0, and in the subsequent cooling process, the sintered metal tightens the Al O ceramics and reduces the compressive force. When cooled to room temperature, the sintering distance becomes 0.o7
The shrinkage was equivalent to Fuyo, and it had the same effect as shrink fitting. In the figure, 1 is A1□O, a ceramic, and a joined body with a sintered metal 12 tightly attached to the outer wall is completed.

Example 2 Figure 2 shows a cross-sectional view of the outer wall of a spherical cylindrical ceramic that is shrink-fitted at the same time as the metal is sintered. Figure A is before sintering, and Figure B is the shrink-fit state after sintering and cooling. shows. Bottom outer diameter 3
A case will be described in which a compact 22 of austenitic stainless powder is sintered on the outer wall of a ZrO□ ceramic sintered body 21 with a diameter of 0Φ111, an inner diameter of 24Φ, and a height of 40 m5 to create a joined body with an outer diameter of 38Φ+u and a height of 44 mm.

When a molded body of austenitic stainless steel No. 5 powder with a density of 5.93 g/c+IT is sintered at 1150° C., it shrinks by 2% in length and has a density of 6.4 g/aI+. Further, the difference in the amount of thermal expansion of ZrO ceramics is 0.20 m.

Bottom outer diameter 38.7Φ fin, inner diameter 30.54Φ crane, height 44
．． 8 fins with an internal height of 40.6 mm, pressed with austenitic stainless steel powder at a pressure of 6000 kg/c
Press molded with Al.

This preformed body 22 was placed on the outer wall of the ZrO□ ceramic 21 with a gap 13 of 0.27 mm, and was sintered in a hydrogen atmosphere at 1150°C using a horse chestnut 24 at an elevated temperature of 300°C/IHr. . After sintering, it was naturally cooled down to room temperature, and the outer wall of the ZrC)□ ceramic 21 was tightened to complete a joined body with the sintered metal austenitic stainless steel 32 that was in close contact with it, as shown in the cross-sectional view of Figure B.

Example 3 Figure 3 shows a cross-sectional view of the outer wall of a cylindrical ceramic fused by melting metal, with Figure A showing the state before sintering, and Figure B showing the state after being cooled and demolded after the fusion.

Z r with outer wall 34Φ crane, inner diameter 26Φl, height 20mm
O, outside A in which Cu-Ni alloy powder was press-molded at 6000 kg/ctl on the outer periphery of the ceramic sintered body 41.
A cylindrical object 42 with a size of 440.6Φ and an inner diameter of 34.6Φ and a height of 2 (ln) was installed with a gap 23 of 0.3 m.Also, a gap 33 of 0.2 m was provided around the outer periphery of the alloy molded body. A fireproof chestnut 45 was installed, and then a 1250
After melting the alloy by raising the temperature to
A joined body of the Cu-Ni alloy 52 and the fused Cu-Ni alloy 52 was obtained. It was found that this alloy exerted a compressive force on the ceramics by shrinkage corresponding to a firing tolerance of 0.06 am.

Before sintering, Figure B shows the cooled state after sintering. FIG. 2 is a sectional view of another embodiment, in which FIG. A shows the state before sintering, and FIG. B shows the state after cooling after sintering. FIG. 2 is a sectional view of another embodiment,
Figure A shows the state before sintering, and Figure B shows the state after cooling after sintering. Third
The figures are cross-sectional views of other examples, in which figure A shows the state before sintering, and figure B shows the state after melting, cooling and demolding.

1.21.41 Ceramic sintered body, 2.
22.42... Metal powder compact, 3.13,2
3.33...Gap, 12,32°52...
...Sintered metal, 24.45...Tochi 31 ζλ11-No A 蔀【2nd A υ 32゜? , No Figure 3 A B Procedural Amendment (Voluntary) June 101, 1982] Commissioner of the Patent Office Kazuto Wakasugi 1, Indication of the case 1981 Patent layer No. 79832 2, Name of the invention Ceramics and metals Manufacturing method of zygote 3, relationship with the case of the person making the amendment Patent applicant address Postal code 467-91 14-18-4, Takatsuji-cho, Mizuho-ku, Nasuya-shi, scope of claims in the specification subject to amendment column and column for i+Y detailed explanation of the invention.

1. The scope of claims on page 1 of the specification is corrected as follows.

"In a method for manufacturing a ceramic-metal bonded body constructed by sintering the outer wall of a substantially cylindrical or spherical shell-shaped ceramic or sintered body with metal, sintering is not performed during sintering of the metal powder compact. Or, a method for producing a joined body of ceramics and metal, characterized in that fusion is also performed at the same time to create a joined body in which compressive force is applied to the ceramics.'' 2, page 2, lines 14 to 15. Medium, [Unsuitable due to tearing and detachment. -1 was corrected to ``If the shrink fit was not performed instantly, the shrink fit could not be achieved due to thermal expansion.''

3. On the second page of the same page, in the third line from the bottom, "cylindrical shape or spherical cylindrical shape" has been corrected to [-gap cylindrical shape or approximately spherical shell shape 1].

4. Same page 5, lines 5 to ra, correct "cylindrical shape or spherical cylindrical shape" to "approximately cylindrical shape or approximately spherical shell shape".

I J ni

Claims (1)

[Claims] In a method for manufacturing a joined body of ceramic nox and metal, which is constructed by shrink-fitting the outer wall of a cylindrical or spherical cylindrical ceramic nox sintered body with metal, shrink-fitting is performed during sintering of the metal powder compact. Alternatively, a method for producing a joined body of ceramics and metal, characterized in that fusion bonding is also performed at the same time to create a joined body in which compressive force is applied to the ceramics.