| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problems that when a silicon nitride sintered body is exposed to a high-temperature fluid or the like, cracking or chipping easily occurs because of its low resistance to thermal impact, and particularly when it is used as a member to be immersed in a molten metal, slag is easily adhered to the surface, and the like. <P>SOLUTION: The silicon nitride sintered body 1 comprises silicon nitride as a main component and has a surface 3 from which a plurality of needle crystals 4 comprising silicon nitride have jutted out, and the valley level of the surface 3 is 60% or lower. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
