Method for preparing configured silicon carbide whisker-reinforc

Details Method for preparing configured silicon carbide whisker-reinforc Method for preparing configured silicon carbide whisker-reinforc

1985-10-16

1987-03-24

Bell, Mark L.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501 89, 501 95, 264 65, 264570, C04B 3510, C04B 3556

Patent

active

046524134

ABSTRACT:
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 in the desired configuration an inert atmosphere at a temperature of about 1800.degree. 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 fracture toughness for use in most structural applications such as gas turbine blades, cylinders, and other components of advanced heat engines.

REFERENCES:
patent: 4507224 (1985-03-01), Toibana et al.
patent: 4543345 (1985-09-01), Wei

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