C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
25/132
C04B 35/80 (2006.01) C04B 35/645 (2006.01)
Patent
CA 1278672
METHOD FOR PREPARING CONFIGURED SILICON CARBIDE WHISKER-REINFORCED ALUMINA CERAMIC ARTICLES Abstract of the Disclosure A ceramic article of alumina reinforced with silicon carbide whiskers suitable for the fabrication into articles of complex geometry are provided by pressureless sintering and hot isostatic pressing steps. In accordance with the method of the invention a mixture of 5 to 10 vol.% silicon carbide whiskers 0.5 to 5 wt.% of a sintering aid such as yttria and the balance alumina powders is ball- milled and pressureless sintered in the desired configuration an inert atmosphere at a temperature of about 1800°C to provide a self-supporting configured composite of a density of at least about 94% theoretical density. The composite is then hot isostatically pressed at a temperature and pressure adequate to provide configured articles of at least about 98% of theoretical density which is sufficient to provide the article with sufficient strength and frac- ture toughness for use in most structural applications such as gas turbine blades, cylinders, and other components of advanced heat engines.
520348
Macrae & Co.
Martin Marietta Energy Systems Inc.
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