Pressureless sintering of whisker-toughened ceramic composites

Details Pressureless sintering of whisker-toughened ceramic composites Pressureless sintering of whisker-toughened ceramic composites

1991-11-06

1993-05-04

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 36, 501 89, C04B 3510

Patent

active

052079589

ABSTRACT:
A pressureless sintering method is disclosed for use in the production of whisker-toughened ceramic composites wherein the sintered density of composites containing up to about 20 vol. % SiC whiskers is improved by reducing the average aspect ratio of the whiskers to from about 10 to about 20. Sintering aids further improve the density, permitting the production of composites containing 20 vol. % SiC with sintered densities of 94% or better of theoretical density by a pressureless sintering method.

REFERENCES:
patent: 4543345 (1985-09-01), Wei
patent: 4652413 (1987-03-01), Tiegs
patent: 4839316 (1989-06-01), Tiegs
patent: 4956316 (1990-09-01), Sawyer
"Sintered Al.sub.2 O.sub.3 -SiC-Whisker Composite," Am. Ceram. Soc. Bull. 66 (2) 339-42 (1987).
Ceramic Technology for Advanced Heat Engines Project Semi-annual Prog. Report for Apr. 1987 through Sep. 1987.
Oak Ridge National Laboratory Report TM-10705, pp. 89-94, issued Apr. 20, 1988.
Processing of Pressureless-Sintered SiC Whisker-Reinforced Al.sub.2 O.sub.3 Composites, S. J. Barclay et al, J. of Mat'l Sci., 22 4403-4406 (1987).
Suspension Processing of Al.sub.2 O.sub.3 /SiC Whisker Composites M. D. Sacks et al, J. Am. Ceram. Soc. 71 (5) 370-79 (1988).
Pressureless Sintering of SiC Whisker-Reinforced Composites, M. D. Sacks, et al, Ceramic Engineering & Sci. Proc., 9 (7-8) pp. 741-754 (1988).

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