| 摘要 |
PROBLEM TO BE SOLVED: To provide a silicon nitride-based composite sintered body having good mechanical properties in the range from room temperature to a low-to- medium temperature, a low coefficient of friction and good abrasion resistance, and to provide a method for producing the same. SOLUTION: The silicon nitride-based composite sintered body comprising silicon nitride, titanium nitride and carbide, silicon carbide and graphite or carbon, is characterized in that it has an average particle diameter of 100 nm or less and a coefficient of friction under no lubrication of 0.2 or less. The method for producing the silicon nitride-based composite sintered body is characterized in that grinding and mixing silicon nitride powders, sintering aid powders, titanium metal powders and graphite or carbon powders until the silicon nitride, titanium nitride and carbide, silicon carbide and graphite or carbon have an average particle diameter of 30 nm or less to form composite secondary particles, molding the composite secondary particles to form moldings, and sintering the moldings at a temperature of 1200-1600 deg.C under non-oxidizing atmosphere to form a sintered body. |
