Sintered ceramic article formed mainly of alumina
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United States of America Patent
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Sep 5, 1995
Grant Date -
N/A
app pub date -
Dec 6, 1994
filing date -
Dec 24, 1993
priority date (Note) -
Expired
status (Latency Note)
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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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