Compositions: ceramic – Ceramic compositions – Refractory
Patent
1985-07-01
1987-07-07
Terapane, John F.
Compositions: ceramic
Ceramic compositions
Refractory
501104, 501105, 501108, 501127, 501134, 501153, C04B 3510, C04B 3504, C04B 3518, C04B 3550
Patent
active
H00003026
ABSTRACT:
The invention is a ceramic composition containing a new class of dispersant for hindering crack propagation by means of one or more energy-dissipative mechanisms. The composition is composed of a ceramic matrix with dispersed particles of a transformation-prone rare-earth niobate, tantalate or mixtures of these with each other and/or with a rare-earth vanadate. The dispersants, having a generic composition tRMO.sub.4, where R is a rare-earth element, B is Nb or Ta and O is oxygen, are mixed in powder form with a powder of the matrix ceramic and sintered to produce a ceramic form or body. The crack-hindering mechanisms operates to provide improved performance over a wide range of temperature and operating conditions.
REFERENCES:
patent: 2040215 (1936-05-01), Rava
patent: 3287143 (1966-11-01), Yavorsky
patent: 4303447 (1981-12-01), Buchanan et al.
patent: 4406699 (1983-09-01), Beck et al.
patent: 4507394 (1985-03-01), Mase et al.
Stevens and Evans, "Transformation Toughening by Dispersed Polycrystalline Zirconia", Br. Ceram. Trans. J., 83, 28-31 (1984).
Aldred Anthony T.
Chan Sai-Kit
Nevitt Michael V.
Hightower Judson R.
Lohff William
Mallon M. L.
Terapane John F.
The United States of America as represented by the United States
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