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SILICON NITRIDE-BASED SINTERED BODY, METHOD FOR PRODUCING THE SAME, CERAMIC HEATER BY USING THE SILICON NITRIDE- BASED SINTERED BODY, AND GLOW PLUG HAVING THE CERAMIC HEATER
SILICON NITRIDE-BASED SINTERED BODY, METHOD FOR PRODUCING THE SAME, CERAMIC HEATER BY USING THE SILICON NITRIDE- BASED SINTERED BODY, AND GLOW PLUG HAVING THE CERAMIC HEATER
PROBLEM TO BE SOLVED: To provide a silicon nitride-based sintered body having stable quality, a method for producing the silicon nitride-based sintered body, a ceramic heater by using the silicon nitride-based sintered body as a base substance, and a glow plug by using the ceramic heater as a heating source. ;SOLUTION: This method for producing the silicon nitride-based sintered body by a hot-press method comprises formulating a shielding agent of a reductive atmosphere with the raw material. A simple substance of Ta, W, Mo and the like, or a compound of the metal element such as a nitride and silicide can be used as the shielding agent of the reductive atmosphere. These simple element and compound are carbonized exceeding the reduction of a sintering adjuvant, and as a result, the reduction of the sintering adjuvant, especially caused by carbon monoxide or the like generated when a graphite die for pressurizing is used, is suppressed. The ceramic heater having the base body formed out of the silicon nitride sintered body, and an exothermic resistant body buried therein, and the glow plug having the ceramic heater as a heating source are provided.;COPYRIGHT: (C)2001,JPO
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