Sintered ceramic article formed mainly of alumina

Details Sintered ceramic article formed mainly of alumina Sintered ceramic article formed mainly of alumina

1994-12-06

1995-09-05

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Yttrium, lanthanide, actinide, or transactinide containing

501128, 501153, 501154, 264 66, C04B 3510

Patent

active

054478944

ABSTRACT:
A sintered ceramic article formed mainly of alumina, having a chemical composition of from 1 to 10% by weight of La.sub.2 O.sub.3, from 0.01 to 0.1% by weight of SiO.sub.2, and the balance of Al.sub.2 O.sub.3 and containing these components in the form of corundum (.alpha.-Al.sub.2 O.sub.3) and lanthanum .beta.-alumina (La.sub.2 O.sub.3.llAl.sub.2 O.sub.3) and a method for the production of a sintered ceramic article formed mainly of alumina, comprising the steps of shaping a mixture of Al.sub.2 O.sub.3, La.sub.2 O.sub.3, and SiO.sub.2, calcining the shaped mixture in the air at a temperature in the range of from 600.degree. C. to 1000.degree. C., and further firing the calcined shaped mixture to a temperature in the range of from 1400.degree. C. to 1800.degree. C.

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Yamaguchi et al. "New Compound in the System LA.sub.2 O.sub.3 --Al.sub.2 O.sub.3 ", J. Am. Ceram. Soc. 68[2] C44-C45, 1985.
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Chemical Abstracts, vol. 107, No. 16, 19 Oct. 1987, Columbus, Ohio, US; abstract No. 139358u, Takahata et al. "Preparation and Mechanical Properties of Lanthanum-Beta-Alumina Composites", p. 323; col. L; & Toyo Soda Kenkyu Hokoku, vol. 31, No. 2, 1987, Japan, pp. 73-80.
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