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    • 25. 发明授权
    • Silicon nitride sintered bodies of Si.sub.3 N.sub.4, Y.sub.2 O.sub.3,
MgO and ZrO.sub.2
    • Si3N4,Y2O3,MgO和ZrO2 + B的氮化硅烧结体
    • US4560669A
    • 1985-12-24
    • US540309
    • 1983-10-11
    • Keiji MatsuhiroMinoru Matsui
    • Keiji MatsuhiroMinoru Matsui
    • C04B35/584C04B35/58
    • C04B35/584
    • Highly densified silicon nitride sintered bodies having excellent mechanical strength and oxidation resistance consist essentially of Si.sub.3 N.sub.4 and contain Y, Mg and Zr, in which a content of Si.sub.3 N.sub.4 is 95-70% by weight, a content of yttrium is 15-2% by weight calculated as Y.sub.2 O.sub.3, a content of magnesium is 15-0.5% by weight calculated as MgO and a content of zirconium is 13-0.5% by weight calculated as ZrO.sub.2 and are produced by forming a mixed raw powder consisting of 95-70% by weight of silicon nitride raw powder, yttrium compound of 15-2% by weight calculated as Y.sub.2 O.sub.3, magnesium compound of 15-0.5% by weight calculated as MgO and zirconium compound of 13-0.5% by weight calculated as ZrO.sub.2 into a shaped body, said yttrium compound, magnesium compound and zirconium compound being sintering aids, and firing the shaped body at a temperature of 1,650.degree.-1,800.degree. C. under ambient pressure in a nitrogen or an inert gas atmosphere.
    • 具有优异的机械强度和抗氧化性的高度致密化的氮化硅烧结体基本上由Si 3 N 4组成,并且含有Y 3,Mg和Zr,其中Si 3 N 4的含量为95-70重量%,钇的含量为15-2重量% 以Y 2 O 3计算,镁的含量为15〜0.5重量%,以MgO计,锆的含量为13〜0.5重量%,以ZrO 2计算,并通过形成由95〜70重量%组成的混合原料粉末 的氮化硅原料粉末,按照Y 2 O 3计算的15-2重量%的钇化合物,以MgO计为15〜0.5重量%的镁化合物,以ZrO 2计为13〜0.5重量%的锆化合物成型体, 钇化合物,镁化合物和锆化合物作为烧结助剂,并在环境压力下在氮气或惰性气体气氛中,在1650℃-1800℃的温度下焙烧成形体。