Silicon nitride sintered bodies of Si.sub.3 N.sub.4, Y.sub.2 O.s

Details Silicon nitride sintered bodies of Si.sub.3 N.sub.4, Y.sub.2 O.s Silicon nitride sintered bodies of Si.sub.3 N.sub.4, Y.sub.2 O.s

1983-10-11

1985-12-24

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

264 65, 501 98, 501104, 501152, 501154, C04B 3558

Patent

active

045606692

ABSTRACT:
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.

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Giachello, A. et al.--Ceramic Bulletin, 59(12), (1980), pp. 1212-1215, "Sintering and Properties of Silicon Nitride Containing Y.sub.2 O.sub.3 and MgO".
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