Ceramic compositions

Details Ceramic compositions Ceramic compositions

1983-10-27

1985-08-06

Williams, Howard S.

Compositions: ceramic

Ceramic compositions

Refractory

501128, 501153, C04B 3510, C04B 3512, C04B 3548

Patent

active

045336474

ABSTRACT:
Novel transformation toughened ceramic compositions comprising finely divided ZrO.sub.2 -HfO.sub.2 solid solution particles dispersed in a Al.sub.2 O.sub.3 -Cr.sub.2 O.sub.3 (alumina) or 3Al.sub.2 O.sub.3.2SiO.sub.2 -3Cr.sub.2 O.sub.3.2SiO.sub.2 (mullite) solid solution matrix phase. It is found that increased hardness and modulus associated with higher relative Cr.sub.2 O.sub.3 content (e.g. 20 mole %) in the matrix phase and increased fracture toughness associated with higher relative HfO.sub.2 content (e.g. 10 to 20 mole %) in the disperse phase represent viable and improved ceramic compositions. Such transformation toughened ceramic compositions are considered useful in superhot light diesel engine applications, high temperature gas turbines and ultrahigh temperature ceramic heat exchangers.

REFERENCES:
patent: 3152523 (1964-10-01), Whitfield et al.
patent: 4053321 (1977-10-01), Okumiya et al.
patent: 4210454 (1980-07-01), Rechter
patent: 4245611 (1981-01-01), Mitchell et al.
patent: 4421861 (1983-12-01), Claussen et al.
"Ceramic Engines" Popular Science, Mar. 1982, pp. 65, 66.
Motorcyclist, Oct. 1981, p. 48.

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