C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/1
C04B 35/58 (2006.01) C04B 35/584 (2006.01)
Patent
CA 1207804
Abstract of the Disclosure Highly densified silicon nitride sintered bodies having excellent mechanical strength and oxidation resistance consist mainly of Si3N4 and contain Y, Mg and Zr, in which a content of Si3N4 is 95-70% by weight, a content of yttrium is 15-2% by weight calculated as Y2O3, 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 ZrO2 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 Y2O3, magnesium compound of 15-0.5% by weight calculated as MgO and zirconium compound of 13-0.5% by weight calculated as ZrO2 into a shaped body, said yttrium compound, magnesium compound and zirconium compound being sintering aids and firing the shaped body at a temperature of 1,650-1,800°C under ambient pressure of nitrogen or an inert gas atmosphere.
439038
Matsuhiro Keiji
Matsui Minoru
Ngk Insulators Ltd.
Smart & Biggar
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