Surface strengthened composite ceramic material

Details Surface strengthened composite ceramic material Surface strengthened composite ceramic material

1988-04-27

1991-09-10

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 32, 501120, 501153, C04B 3510

Patent

active

050473743

ABSTRACT:
A surface-strengthened composite ceramic material has a ceramic matrix and a refractory phase dispersed at least in and close to the surface of the matrix. The refractory phase includes beta-alumina particles in which larger cations producing a larger molar volume replace sufficient smaller cations in beta-alumina particles in and close to the surface of the composite ceramic material to cause compressive surface stresses which increase the surface strength of the composite ceramic material. The smaller cations are replaced by the larger cations after firing of the composite ceramic material.

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