| 摘要 |
PROBLEM TO BE SOLVED: To provide a wear resistant material which is a silicon nitride-based composite material formed by dispersing dispersion particles essentially consisting of nitrides of metals into a matrix essentially consisting of Si3N4, is manufactured by using the Si3N4 raw material having an oxygen quantity of an ordinary level and is practically problem-free in spite of a wide variation in the oxygen quantity of the material to an ordinary level. SOLUTION: The silicon nitride-base composite material which is formed by dispersing the particles essentially consisting of the metal nitride of <=200 nm in an average grain size at 10 to 50 vol.% as the dispersion particles into the matrix consisting of silicon nitride particles of <=200 nm in an average grain size and grain boundary phase and in which the total oxygen quantity in the sintered compact is large within a range from the total oxygen quantity in the raw material powder up to maximum 3 wt.%. The material is obtained by pulverizing and mixing the sintering assistant powder and the metals and/or their nitride powder in such a manner that the average grain size over the entire part attains <=100 nm and the increased oxygen quantity in the powder attains a range of 0.5 to 3 wt.% and sintering the moldings thereof under a nonoxidizing atmosphere containing nitrogen at 1,000 to 1,600 deg.C. |
