PURPOSE: To provide a microwave absorbing heating element capable of generating heat with a high exothermic efficiency by efficiently absorbing microwaves with hardly any penetration thereof through the interior of the heating element.
CONSTITUTION: The microwave absorbing heating element is composed of a silicon carbide-containing porous body, having 30-80% porosity and containing 70-95wt.% silicon carbide, 5-30wt.% inorganic binder and electrically conductive powder. The electrically conductive powder in an amount of 1-10wt.% based on the total amount of the silicon carbide and inorganic binder is added thereto. The microwave absorbing heating element of this invention uses the prescribed amount of the silicon carbide as a heating element and it is a porous body having a porosity as high as 30-80%, the gas diffusivity is excellent and the heat convection and thermal shock resistance are good. Furthermore, since the electrically conductive powder is contained in the prescribed proportion in the raw material, the microwave absorbing exothermic efficiency is remarkably high. Heat-resistant and antioxidizing electrically conductive powder having ≤100μm grain diameter and ≤1Ω.cm resistivity is preferred as the electrically conductive powder.
Toshitaka Fujikawa
Hiroshi Sasaki
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