Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1991-02-22
1993-02-23
Bell, Mark L.
Stock material or miscellaneous articles
Composite
Of inorganic material
501 87, 501 96, 501 98, 501105, 501127, C04B 3556, C04B 3558
Patent
active
051889080
ABSTRACT:
There is disclosed an Al.sub.2 O.sub.3 based ceramic which includes 5% to 50% by weight of a hard dispersed phase of at least one compound selected from metal carbide, metal nitride, metal carbonitride, metal oxy-carbide, metal oxy-nitride and metal carbo-oxy-nitride. The compound is represented by M(CNO), wherein M is at least one metal selected from the group consisting of Ti, Zr and Hf. The ceramic contains no greater than 25% by weight of ZrO.sub.2, and balance Al.sub.2 O.sub.3 matrix. which contains an additive dissolved in the Al.sub.2 O.sub.3 grains so as to form solid solution therewith. The additive is contained in an amount of 0.01% to 12% by weight with respect to the Al.sub.2 O.sub.3 matrix and is at least one oxide of an element selected from the group consisting of Y, Mg, Cr, Ni, Co, and rare earth elements. The Al.sub.2 O.sub.3 grains have an average grain size no larger than 1.0 .mu.m while the hard phase constituent has an average grain size no larger than 0.6 .mu.m.
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Aikawa Yasutaka
Kato Munenori
Koyama Takashi
Nishiyama Akio
Ohshima Hideo
Bell Mark L.
Marcantoni Paul
Mitsubishi Materials Corporation
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