| 摘要 |
PROBLEM TO BE SOLVED: To provide a silicon nitride sintered compact having high strength, high toughness and excellent heat dissipating properties. SOLUTION: A silicon nitride powder is characterized in that the particle diameters (d10 ), (d50 ) and (d90 ) corresponding to accumulated frequencies of 10%, 50% and 90% by volume, respectively, have particle diameter distribution of 0.5 to 0.8 μm, 2.5 to 4.5 μm and 7.5 to 10.0 μm, respectively, and the content of oxygen is 0.01 to 0.5 wt.%. The silicon nitride sintered compact is obtained by using this silicon nitride power, and has a thermal conductivity of >=80 W/m.K, a three-point bending strength at room temperature of >=600 MPa and fracture toughness of >=5 MPa.m<1/2> . |
