Composite ceramic articles and method of making
AssigneeGTE Sylvania Incorporated
InventorsWilliam T. Kiger, George J. Kamin, deceased, by Shirley A. Kamin, administratrix
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Abstract
Ceramic bodies coated or joined to one another with ceramic eutectic compositions of alumina, silica and rare earth oxides melting below 1600.degree. C are described. An exemplary composition contains about 20 weight percent alumina, 58 weight percent silica, and 22 weight percent yttria. Composite structures of such bodies exhibit good to excellent thermal shock resistance, resistance to chemical attack, and joint strengths between bodies and coatings or between various silica, alumina and rare earth oxide based ceramics joined together or to each other.
Claims3
A composite structure comprising at least two ceramic bodies, each body selected from the group consisting of rare earth based, alumina based, and silica based ceramic compositions, said bodies having at least a portion of their respective surfaces joined by a eutectic composition of alumina, silica and rare earth oxide wherein the eutectic composition consists essentially of, in weight percent, 11-33 percent alumina, 25 to 59 percent silica, and 22 to 53 percent of said rare earth oxide.
Dependencies are inferred from the claim text.