| 摘要 |
PROBLEM TO BE SOLVED: To produce a composite ceramic excellent in mechanical strength and friction characteristic and having a dense structure, by dispersing a solid lubricant such as carbon in a nonoxide ceramic mother phase such as silicon nitride and further putting an iron compound in the interface part of the both phases. SOLUTION: This composite ceramic is formed by dispersing a solid lubricant phase 4 comprising at least one selected from between graphite and boron nitride in a mother phase 2 comprising nonoxide ceramics such as silicon nitride, silicon carbide and sialon, and further putting an iron compound phase 3 such as an oxide and silicide of iron having compatibility with the both phases in the interface part of the both phases. The composite ceramic 2 is produced by previously coating the surface of the solid lubricant with the iron compound, formulating the coated solid lubricant with the silicon nitride powder raw material, forming a compact of the formulated silicon nitride powder raw material and firing the compact. Moreover, the iron compound phase 3 comprises an iron compound phase 3a enclosing the solid lubricant phase 4 and having a large particle diameter, and a fine iron compound phase 3b comprising only the iron compound, and the iron compound phase 3b acts as an adsorbing phase. |
