Compositions: ceramic – Ceramic compositions – Refractory
Patent
1980-04-02
1981-12-01
Vertiz, O. R.
Compositions: ceramic
Ceramic compositions
Refractory
264 65, 501104, 501105, 501152, C04B 3548
Patent
active
043034470
ABSTRACT:
Addition of from about 1.0 to about 15% by weight of a vanadium oxide or boric oxide promoter to a zirconia (ZrO.sub.2) powder promotes rapid densification at temperatures below about 1300.degree. C. For example, a density of greater than 92% of estimated theoretical density can be achieved by addition of 4% by weight of ZrV.sub.2 O.sub.7 to monoclinic ZrO.sub.2 and sintering at 1100.degree. C. for about 24 hours. Sintering at temperatures below about 1150.degree. C. avoids the destructive monoclinic/tetragonal phase transformation and provides for better control of microstructure and composition. A density of greater than 98% of estimated theoretical density can be achieved by addition of from about 2 to about 5% by weight of a boric oxide promoter to stabilized cubic ZrO.sub.2 and sintering at about 1200.degree. C. for about 4 hours.
REFERENCES:
patent: 2875086 (1959-02-01), Weyl
patent: 3011901 (1961-12-01), Traub et al.
patent: 3385915 (1968-05-01), Hamling
patent: 3410728 (1968-11-01), Fullman et al.
patent: 3862283 (1975-01-01), Rhodes
Buchanan Relva C.
DeFord H. Dale
Sircar Anup
Bell Mark
Kalinowski Mathew L.
University of Illinois Foundation
Vertiz O. R.
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