| 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 comprises silicon nitride, titanium compounds and boron nitride, and has an average particle diameter of 100 nm or less and a coefficient of friction under no lubrication of 0.3 or less. The method for producing the silicon nitride-based composite sintered body comprises grinding and mixing silicon nitride powders, sintering aid powders, titanium metal powders and boron nitride powders until they have an average primary particle diameter of 20 nm or less to form secondary particles, preparing moldings, and sintering the moldings at a temperature of 1200-1600 deg.C under nitrogen atmosphere to form a sintered body. |
