| 摘要 |
A silicon nitride sintered body essentially consisting of compounds of Mg, Sr, Ce and Al in amounts of from 0.5 to 5% by weight when calculated as MgO, from 0.5 to 5% by weight when calculated as SrO, from 1 to 10% by weight when calculated as CeO2 and from 1 to 20% by weight when calculated as Al2O3, respectively, and the balance being silicon nitride. A method of manufacturing the silicon nitride sintered body is also disclosed. The silicon nitride sintered body has a low thermal conductivity while high mechanical strength and high thermal shock resistance being maintained.
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