Al.sub.2 O.sub.3 based ceramic

Details Al.sub.2 O.sub.3 based ceramic Al.sub.2 O.sub.3 based ceramic

1992-08-20

1994-01-04

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 96, 501 98, 501105, 501127, 428698, C04B 3556, C04B 3558

Patent

active

052759814

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 optionally contains 1% to 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.

REFERENCES:
patent: 5188908 (1993-02-01), Nishiyama et al.

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