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Ceramic heater

A ceramic heater, ceramic technology, applied in ohmic resistance heating, heating element material, heating element shape and other directions, can solve problems such as damage, large thermal stress, etc., and achieve improved durability, increased high temperature strength, and effective anchoring effect. Effect

Active Publication Date: 2011-09-28
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the conventional ceramic heater as described above, even if the difference between the thermal expansion coefficient of the heating element and the base body becomes small, a large current flows and a large thermal stress is generated when an abnormality occurs, so there is a gap in the base body. Destroy such a problem to be solved

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Examples

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Embodiment Construction

[0018] Hereinafter, examples of embodiments of the ceramic heater of the present invention will be described in detail with reference to the drawings.

[0019] figure 1 (a) is a perspective internal plan view showing an example of an embodiment of the ceramic heater of the present invention, figure 1 (b) is an enlarged view of its main part. exist figure 1 In , the transparent heating element 2 is shown with hatching. in addition, figure 2 yes figure 1 X-X line sectional view of the example shown.

[0020] The ceramic heater 10 of this example has: a base body 1, which is made of ceramics; The connection part 2c of the set part 2a, 2b; The heating element 2 has a U-shape composed of two opposing portions 2a, 2b arranged in parallel in the base body 1, and an arc-shaped connection portion 2c connecting the opposing portions 2a, 2b. The electric current flows to the heating element 2 through the lead-out parts 3a and 3b, thereby causing the heating element 2 to generate...

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Abstract

There has been such a problem that gaps are generated or cracks are generated in a base body due to a momentary difference between the thermal expansion of a heat generating body and that of the base body in the abnormal cases, such as the case wherein a high current rushes and flows just after starting operation. Disclosed is a ceramic heater (10) wherein a heat generating body (2) is embedded in a base body (1) composed of ceramic, and the heat generating body (2) has, on the surface thereof, a hollow (5) filled with the ceramic. Even in the case where a large thermal stress is generated between the heat generating body (2) and the base body (1) due to the thermal expansion difference, since the hollow (5) filled with the ceramic is provided on the base body (1), generation of gaps between the heat generating body (2) and the base body (1) and generation of cracks in the base body (1) can be eliminated even in the longitudinal direction of the heat generating body (2) to which the thermal stress is heavily applied.

Description

technical field [0001] This invention relates to ceramic heaters. Background technique [0002] Conventionally, ceramic heaters have been used in various applications including, for example, ignition heaters of kerosene fan heaters and glow plugs used to assist diesel engine starting. This ceramic heater is configured, for example, by embedding a heating element made of conductive ceramics in a base made of insulating ceramics. In such a ceramic heater, as a raw material constituting the heating element, it is known to use a raw material mainly composed of at least one of silicide, nitride and carbide of molybdenum or tungsten, and as a raw material constituting the matrix, A raw material mainly composed of silicon nitride is known. [0003] However, in general, the thermal expansion coefficient of the material constituting the heating element is larger than that of the base material, and therefore, cracks may occur in the base due to thermal stress generated between the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/48F23Q7/00
CPCH05B2203/027H05B3/48F23Q7/001F23Q7/00H05B3/14
Inventor 山元坚
Owner KYOCERA CORP
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