| 摘要 |
PURPOSE: To obtain high strength and high reliability silicon nitride structural parts. CONSTITUTION: When a silicon nitride-based sintered compact is produced, working stock for this sintered compact is heat-treated at a temp. within the range of (a temp. at which the max. value of specific peaks of the internal friction of the stock is shown)±150 deg.C. A typical example of the sintered compact is a sintered compact obtd. by compacting a mixture consisting of 5-15wt.% (expressed in terms of oxides) one or more kinds selected from among rare earth elements and Al, 0.5-5wt.% (expressed in terms of oxides) one or more kinds selected from along Mg, Ti and Ca and the balance Si3 N4 and sintering the resultant compact in an N2 -contg. atmosphere at 1,500-1,700 deg.C. |
