WO2014003093A1 - ヒータおよびこれを備えたグロープラグ - Google Patents
ヒータおよびこれを備えたグロープラグ Download PDFInfo
- Publication number
- WO2014003093A1 WO2014003093A1 PCT/JP2013/067603 JP2013067603W WO2014003093A1 WO 2014003093 A1 WO2014003093 A1 WO 2014003093A1 JP 2013067603 W JP2013067603 W JP 2013067603W WO 2014003093 A1 WO2014003093 A1 WO 2014003093A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resistor
- lead
- heater
- ceramic particles
- insulating
- Prior art date
Links
- 239000000919 ceramic Substances 0.000 claims abstract description 102
- 239000002245 particle Substances 0.000 claims abstract description 98
- 239000004020 conductor Substances 0.000 claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- 229910052581 Si3N4 Inorganic materials 0.000 description 26
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 26
- 239000000758 substrate Substances 0.000 description 24
- 230000008646 thermal stress Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 229910016006 MoSi Inorganic materials 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910021332 silicide Inorganic materials 0.000 description 2
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/016—Heaters using particular connecting means
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/027—Heaters specially adapted for glow plug igniters
Definitions
- the present invention is, for example, for a heater for ignition or flame detection in a combustion-type in-vehicle heating device, a heater for ignition of various combustion devices such as an oil fan heater, a heater for a glow plug of an automobile engine, and various sensors such as an oxygen sensor.
- the present invention relates to a heater used for a heater or a heater for heating a measuring instrument.
- the present invention also relates to a glow plug provided with the above heater.
- a heater used for a glow plug of an automobile engine includes a resistor having a heat generating portion, a lead, and an insulating base.
- the lead and resistor materials are selected and the shape is designed so that the resistance value of the lead is smaller than the resistance value of the resistor (see, for example, Patent Document 1).
- heaters tend to be used in a higher temperature environment than ever before. Therefore, under the heat cycle, the thermal stress generated in the heater may have a larger influence than before.
- the heater of the present invention is a heater comprising an insulating base made of ceramics, a resistor embedded in the insulating base, and a lead connected to an end of the resistor, the resistor and the lead Both contain a conductor and ceramic particles dispersed in the conductor, and the insulating ceramic particles contained in the resistor are smaller than the insulating ceramic particles contained in the lead.
- the present invention is a glow plug including the heater having the above-described configuration and a metal holding member that is electrically connected to the lead and holds the heater.
- (A) is a schematic longitudinal cross-sectional view which shows an example of embodiment of the heater of this invention
- (b) is a principal part enlarged view of the area
- the heater 10 of the present embodiment includes an insulating base 1 made of ceramics, a resistor 2 embedded in the insulating base 1, and a lead 3 connected to an end of the resistor 2. Both the resistor 2 and the lead 3 contain conductors 21 and 31 and insulating ceramic particles (hereinafter also simply referred to as ceramic particles) 22 and 32. The ceramic particles 22 included in the resistor 2 are smaller than the ceramic particles 32 included in the lead 3.
- the insulating base 1 in the heater 10 of the present embodiment has, for example, a rod shape.
- the insulating substrate 1 covers the conductor line 6 (resistor 2 and lead 3).
- the conductor line 6 (resistor 2 and lead 3) is embedded in the insulating substrate 1.
- the insulating substrate 1 is formed of ceramics. Thereby, the heat resistance of the insulating substrate 1 can be increased. As a result, the reliability of the heater 10 in a high temperature environment is improved.
- ceramics used for the insulating substrate 1 include electrically insulating ceramics such as oxide ceramics, nitride ceramics or carbide ceramics.
- the insulating substrate 1 is made of silicon nitride ceramics.
- Silicon nitride ceramics are excellent in strength, toughness, insulation and heat resistance.
- This silicon nitride ceramic can be obtained by the following method. For example, 3 to 12% by mass of a rare earth element oxide such as Y 2 O 3 , Yb 2 O 3 or Er 2 O 3 or 0.5 to 3% by mass of Al as a sintering aid with respect to silicon nitride as a main component. 2 O 3 and SiO 2 are mixed. At this time, SiO 2 is added so that the amount of SiO 2 contained in the sintered body is 1.5 to 5% by mass. Then, the obtained mixture is formed into a predetermined shape. Thereafter, silicon nitride ceramics can be obtained by, for example, hot press firing at 1650 to 1780 ° C.
- MoSi 2 or WSi 2 or the like is dispersed in an insulating substrate 1 made of silicon nitride ceramics.
- the coefficient of thermal expansion of the insulating substrate 1 having a silicon nitride ceramic as a base material can be brought close to the coefficient of thermal expansion of the conductor line 6 containing Mo or W.
- the thermal stress generated between the insulating base 1 and the conductor line 6 can be reduced.
- the durability of the heater 10 can be improved.
- the resistor 2 is embedded in the insulating substrate 1.
- the resistor 2 has a heat generating portion 20 that is a region that mainly generates heat.
- the vicinity of the middle point of the folding generates the most heat. In this case, the vicinity of the turn-around intermediate point is the heat generating portion 20.
- the resistor 2 is mainly composed of a metal such as W, Mo or Ti, or a carbide, nitride or silicide of these metals.
- This main component is the conductor 21 described above.
- the conductor 21 may be particulate as shown in FIG. 1B, but is not limited thereto.
- the conductor 21 may have a scale shape or a needle shape.
- the resistor 2 includes tungsten carbide (WC) as the conductor 21.
- WC tungsten carbide
- the resistor 2 has WC as a main component, and 20% by mass or more of silicon nitride is added to the WC.
- This silicon nitride is the ceramic particles 22 described above.
- the conductor 21 serving as the resistor 2 has a higher coefficient of thermal expansion than silicon nitride.
- thermal stress is applied between the insulating base 1 and the resistor 2 under a heat cycle. Therefore, by adding silicon nitride as the ceramic particles 22 in the resistor 2, the coefficient of thermal expansion of the resistor 2 is brought close to the coefficient of thermal expansion of the insulating substrate 1. Thereby, the thermal stress generated between the insulating substrate 1 and the resistor 2 when the heater 10 is heated and lowered can be reduced.
- the content of silicon nitride contained in the resistor 2 is 40% by mass or less, variation in the resistance value of the resistor 2 can be reduced, and thus the resistance value can be easily adjusted. Therefore, in the heater 10 of the present embodiment, the content of silicon nitride contained in the resistor 2 is 20 to 40% by mass. As an additive to be added to the resistor 2, 4 to 12% by mass of boron nitride can be added instead of silicon nitride.
- the thickness of the resistor 2 is, for example, 0.5 to 1.5 mm.
- the width of the resistor 2 is, for example, 0.3 to 1.3 mm.
- the lead 3 connected to the end of the resistor 2 is mainly composed of a metal such as W, Mo or Ti or a carbide, nitride or silicide of these metals.
- This main component is the conductor 31 described above.
- the lead 3 can use the same material as the resistor 2.
- the lead 3 includes WC as the conductor 31. This is because the difference in thermal expansion coefficient between the silicon nitride ceramics constituting the insulating substrate 1 and WC is small.
- the lead 3 contains WC as a main component, and 15% by mass or more of silicon nitride is added to the WC. This silicon nitride is the ceramic particles 32 described above.
- the thermal expansion coefficient of the lead 3 can be made closer to the thermal expansion coefficient of the insulating substrate 1. Thereby, the thermal stress generated between the lead 3 and the insulating substrate 1 can be reduced. Further, when the silicon nitride content is 40% by mass or less, variation in the resistance value of the lead 3 can be reduced, so that the resistance value can be easily adjusted. Therefore, in the heater 10 of the present embodiment, the content of silicon nitride contained in the lead 3 is 15 to 40% by mass.
- the cross-sectional area of the lead 3 in the direction perpendicular to the direction of current flow is larger than the cross-sectional area of the resistor 2 in the direction perpendicular to the direction of current flow.
- the cross-sectional area of the lead 3 is about 2 to 5 times the cross-sectional area of the resistor 2.
- the resistance of the lead 3 can be made smaller than the resistance of the resistor 2.
- the resistance of the resistor 2 is made larger than the resistance of the lead 3.
- the heater 10 is designed to generate heat in the resistor 2.
- the lead 3 has a thickness of 1 to 2.5 mm, for example.
- the width of the lead 3 is, for example, 0.5 to 1.5 mm.
- the resistance value of the lead 3 may be made lower than the resistance value of the resistor 2 by making the content of the ceramic particles 32 in the lead 3 smaller than the content of the ceramic particles 22 in the resistor 2.
- the conductor lines 6 include conductors 21 and 31 and ceramic particles 22 and 32.
- the ceramic particles 22 included in the resistor 2 are smaller than the ceramic particles 32 included in the lead 3.
- the specific surface area of the ceramic particles 22 included in the resistor 2 is increased. Since the ceramic particles 22 having a large specific surface area are dispersed in the conductor 21, the resistor 2 is relatively less likely to thermally expand. On the contrary, when the ceramic particles 32 included in the lead 3 are large, the specific surface area of the ceramic particles 32 included in the lead 3 is reduced. Since the ceramic particles 32 having a small specific surface area are dispersed in the conductor 31, the leads 3 are relatively easily thermally expanded. On the other hand, when attention is paid to the temperature distribution of the heater 10 when the heater 10 is used, the resistor 2 that generates heat has a relatively high temperature and the lead 3 has a relatively low temperature.
- the resistor 2 that has a relatively high temperature is less likely to thermally expand, and the temperature is relatively low.
- the resulting lead 3 can be easily thermally expanded. Thereby, when using the heater 10, the difference between the thermal stress generated between the resistor 2 and the insulating substrate 1 and the thermal stress generated between the lead 3 and the insulating substrate 1 can be reduced.
- the average particle diameter of the ceramic particles 32 included in the lead 3 is, for example, 0.1 to 15 ⁇ m.
- the average particle size of the ceramic particles 22 included in the resistor 2 is 20% to 90%, preferably 50% to 70%, of the average particle size of the ceramic particles included in the lead 3.
- the average particle size of the ceramic particles 22 and 32 may be measured as follows.
- the heater 10 is cut at an arbitrary place where the resistor 2 or the lead 3 is embedded, and the cross section is observed with a scanning electron microscope (SEM) or a metal microscope.
- SEM scanning electron microscope
- An arbitrary five straight lines are drawn on the obtained image, and the average value of the lengths of 50 particles crossing the straight line can be set as the average particle diameter.
- This method of obtaining the average particle diameter is called a code method.
- the average particle diameter can be obtained by an image analysis apparatus LUZEX-FS manufactured by Nireco.
- the ceramic particles 22 and 32 constituting the conductor line 6 are made of the same material as the ceramic forming the insulating base 1.
- the thermal stress produced between the insulating bases 1 can be reduced.
- the ceramic particles 22 and 32 being made of the same material as the ceramic forming the insulating base 1 are not limited to those in which the ceramic particles 22 and 32 are made of the same ceramic as the insulating base 1.
- the main component of the ceramic particles 22 and 32 and the main component of the insulating base 1 are made of the same ceramic.
- the ceramic particles 22 and 32 may be composed of silicon nitride.
- the ceramic particles 22 and 32 included in the resistor 2 and the lead 3 are both acicular particles.
- the length of the major axis of the ceramic particle 22 included in the resistor 2 is shorter than the length of the major axis of the ceramic particle 32 included in the lead 3.
- the aspect ratio of the particles crossing the straight line (long axis length / short
- the average value of the length of the shaft is, for example, 1.5 to 10
- the average value of the length of the long axis is, for example, 0.1 to 15 ⁇ m.
- the average value of the aspect ratios of the particles crossing the straight line (long axis length / short axis length) is in the lead 3. It is smaller than the average aspect ratio of the ceramic particles 32 contained.
- the average value of the major axis length of the ceramic particles 22 included in the resistor 2 is 90% or less of the average value of the major axis length of the ceramic particles 32 included in the lead 3.
- the ceramic particles 22 and 32 included in the resistor 2 and the lead 3 are both needle-shaped particles, the ceramic particles 22 and the ceramic particles 32 are entangled with each other, whereby the strength of the heater 10 is improved. As a result, it is possible to reduce the possibility that the heater 10 will be bent by an external force.
- the ceramic particles 22 and 32 included in the resistor 2 and the lead 3 are not limited to the case where both are acicular particles, and the ceramic particles 32 included in the lead 3 are acicular particles.
- the ceramic particles 22 included may be particles that are not acicular.
- the ceramic particles 22 included in the resistor 2 may be acicular particles, and the ceramic particles 32 included in the lead 3 may be non-acicular particles. In such a case, the size of the particle is evaluated by comparing the length of the major axis of the acicular particle with the length (diameter) of the non-acicular particle.
- the lead 3 may be connected to the end of the resistor 2 so as to wrap around the end of the resistor 2. Thermal stress tends to concentrate at the end of the resistor 2, but by enveloping this portion with the leads 3, the thermal stress generated between the resistor 2 and the insulating substrate 1 can be reduced. Thereby, microcracks are less likely to occur between the ceramic particles 22 on the surface layer portion of the resistor 2 and the conductor 21. As a result, the change in resistance value of the resistor 2 can be reduced.
- the heater 10 of the present embodiment can be used as a glow plug 100 that is electrically connected to the lead 3 and includes a metal holding member 4 that holds the heater 10.
- a metal holding member 4 (sheath fitting) is electrically connected to one lead 3.
- an electrode 5 is electrically connected to the other lead 3.
- a cap type electrode or the like can be used as the electrode 5.
- a wire etc. can also be used, for example.
- the metal holding member 4 (sheath fitting) is a metal cylindrical body that holds the heater 10.
- One lead 3 drawn out to the side surface of the insulating base 1 is joined with a brazing material or the like.
- the electrode 5 is joined to the other lead 3 drawn out to the rear end of the insulating base 1 with a brazing material or the like.
- the glow plug 100 of this example includes the heater 10 in which the difference between the thermal stress generated between the resistor 2 and the insulating base 1 and the thermal stress generated between the lead 3 and the insulating base 1 is reduced. , Durability is improved.
- the heater 10 of the present embodiment can be formed by, for example, an injection molding method or the like.
- conductive ceramic powder such as WC, WSi 2 , MoSi 2 or SiC is prepared as a material for the conductors 21 and 31. Further, as a material for the ceramic particles 22 and 32, an insulating ceramic powder such as Si 3 N 4 , Al 2 O 3 , ZrO 2 or AlN is prepared. Then, a conductive paste to be the resistor 2 or the lead 3 is produced using the conductive ceramic powder. Then, the insulating ceramic powder is dispersed in the conductive paste. At this time, the insulating ceramic powder added to the conductive paste to be the resistor 2 has a smaller particle diameter than the insulating ceramic powder to be added to the conductive paste to be the lead 3. In addition, a ceramic paste to be the insulating base 1 including the insulating ceramic powder and the resin binder is prepared.
- a conductive paste molded body (molded body a) having a predetermined pattern to be the resistor 2 is formed by an injection molding method or the like using the conductive paste. Then, the conductive paste is filled in the mold while the molded body a is held in the mold, and a molded body (molded body b) of a predetermined pattern of conductive paste to be the leads 3 is formed. Thereby, the molded object a and the molded object b connected to this molded object a will be in the state hold
- the obtained molded body d is fired at, for example, a temperature of 1650 to 1780 ° C. and a pressure of 30 to 50 MPa, whereby the heater 10 can be manufactured.
- the firing is preferably performed in a non-oxidizing gas atmosphere such as hydrogen gas.
- sample 1 was produced. Specifically, in samples 1 to 3, the insulating base 1 is mainly composed of silicon nitride, and the resistor 2 and the lead 3 are mainly composed of WC. In Samples 1 to 3, silicon nitride was dispersed as insulating ceramic particles 22 and 32 in the resistor 2 and the lead 3. The particle sizes of the dispersed insulating ceramic particles 22 and 32 are as follows.
- insulating ceramic particles 22 having an average particle diameter of 10 ⁇ m were dispersed in the resistor 2, and insulating ceramic particles 32 having an average particle diameter of 8 ⁇ m were dispersed in the lead 3.
- insulating ceramic particles 22 having an average particle diameter of 6 ⁇ m were dispersed in resistor 2
- insulating ceramic particles 32 having an average particle diameter of 8 ⁇ m were dispersed in lead 3.
- insulating ceramic particles 22 having an average particle diameter of 4 ⁇ m were dispersed in the resistor 2
- insulating ceramic particles 32 having an average particle diameter of 8 ⁇ m were dispersed in the lead 3.
- substrate 1 is circular.
- the outer peripheral shape in the cross section of the resistor 2 and the lead 3 is an ellipse.
- the diameter of the insulating substrate 1 was 3.5 mm
- the thickness of the resistor 2 and the lead 3 was 1.3 mm
- the width was 0.6 mm.
- a cycle test was conducted using these heaters 10.
- the conditions of the cycle test are as follows. First, the heater 10 is energized for 5 minutes so that the temperature of the resistor 2 is 1400 ° C., and then the energization is stopped and left for 2 minutes. With this as one cycle, a heat cycle test of 10,000 cycles was performed. The results are shown in Table 1.
- the resistance change rate of the samples (samples 2 and 3) of the example of the present invention was 1% or less. Further, when the resistor 2 and the lead 3 were observed, no occurrence of microcracks was observed in each of the connecting portions. On the other hand, the resistance change rate of the sample of the comparative example (sample 1) was 40%. In addition, a crack occurred at the connection portion between the resistor 2 and the lead 3. From the above results, it was found that the thermal stress generated in the heater 10 can be reduced by using the configuration of the present invention.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
Abstract
Description
従って、本実施の形態のヒータ10において、抵抗体2に含まれる窒化珪素の含有量は20~40質量%である。また、抵抗体2に添加する添加物として、窒化珪素の代わりに窒化硼素を4~12質量%添加することもできる。
2:抵抗体
10:ヒータ
100:グロープラグ
20:発熱部
3:リード
21,31:導電体
22,32:絶縁性セラミック粒子
4:金属製保持部材
5:電極
6:導体線路
Claims (5)
- セラミックスからなる絶縁基体と、該絶縁基体に埋設された抵抗体と、該抵抗体の端部に接続されたリードとを備えたヒータであって、前記抵抗体および前記リードはともに導電体および該導電体中に分散している絶縁性セラミック粒子を含有しており、前記リードに含まれる前記絶縁性セラミック粒子よりも前記抵抗体に含まれる前記絶縁性セラミック粒子の方が小さいヒータ。
- 前記抵抗体および前記リードに含まれる前記絶縁性セラミック粒子はともに針状の粒子からなり、前記リードに含まれる前記絶縁性セラミック粒子の長軸の長さよりも前記抵抗体に含まれる前記絶縁性セラミック粒子の長軸の長さの方が短い請求項1に記載のヒータ。
- 前記絶縁性セラミック粒子は前記絶縁基体を形成する前記セラミックスと同じ材料からなる請求項1または請求項2に記載のヒータ。
- 前記リードは、前記抵抗体の端部を包み込むようにして前記抵抗体の端部に接続されている請求項1乃至請求項3のうちいずれかに記載のヒータ。
- 請求項1に記載のヒータと、前記導体線路に電気的に接続されるとともに前記ヒータを保持する金属製保持部材とを備えたグロープラグ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201380034312.8A CN104396342B (zh) | 2012-06-29 | 2013-06-27 | 加热器及具备该加热器的电热塞 |
JP2014522670A JP5777812B2 (ja) | 2012-06-29 | 2013-06-27 | ヒータおよびこれを備えたグロープラグ |
EP13808581.6A EP2869666B1 (en) | 2012-06-29 | 2013-06-27 | Heater and glow plug equipped with same |
US14/411,195 US10480786B2 (en) | 2012-06-29 | 2013-06-27 | Heater and glow plug including the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012147094 | 2012-06-29 | ||
JP2012-147094 | 2012-06-29 |
Publications (1)
Publication Number | Publication Date |
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WO2014003093A1 true WO2014003093A1 (ja) | 2014-01-03 |
Family
ID=49783231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2013/067603 WO2014003093A1 (ja) | 2012-06-29 | 2013-06-27 | ヒータおよびこれを備えたグロープラグ |
Country Status (5)
Country | Link |
---|---|
US (1) | US10480786B2 (ja) |
EP (1) | EP2869666B1 (ja) |
JP (1) | JP5777812B2 (ja) |
CN (1) | CN104396342B (ja) |
WO (1) | WO2014003093A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017004915A (ja) * | 2015-06-16 | 2017-01-05 | 日本特殊陶業株式会社 | セラミックヒータおよびグロープラグ |
JP2019129120A (ja) * | 2018-01-26 | 2019-08-01 | 日本特殊陶業株式会社 | セラミックヒータ及びグロープラグ |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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JP2019129120A (ja) * | 2018-01-26 | 2019-08-01 | 日本特殊陶業株式会社 | セラミックヒータ及びグロープラグ |
Also Published As
Publication number | Publication date |
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EP2869666A1 (en) | 2015-05-06 |
EP2869666A4 (en) | 2016-03-09 |
JPWO2014003093A1 (ja) | 2016-06-02 |
JP5777812B2 (ja) | 2015-09-09 |
US10480786B2 (en) | 2019-11-19 |
CN104396342A (zh) | 2015-03-04 |
EP2869666B1 (en) | 2017-03-29 |
US20150167975A1 (en) | 2015-06-18 |
CN104396342B (zh) | 2016-02-24 |
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