Composites for wear

Details Composites for wear Composites for wear

1995-03-22

1997-03-18

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 90, 501 95, 501 97, 501 98, 501100, 428196, 428210, 428446, 428450, 428689, 428697, 428698, 428699, C04B 35565, C04B 35584

Patent

active

056122659

ABSTRACT:
The invention discloses a long carbon fibre reinforced ceramic matrix composite in which the matrix is an engineering ceramic, characterized in that the engineering ceramic comprises Al.sub.2 O.sub.3 and Y.sub.2 O.sub.3 as highly refractory sinter additives, the composite has a high density of at least 95% theoretical, a high fibre content of at least 30% by volume, and that substantially all the fibres are uniformly distributed within the matrix with a uniform inter-fibre spacing of 10-15 micrometer. The invention also discloses a process for preparing such a composite, characterized in that unidirectionally wound fibre tapes are cut into sections, the sections are infiltrated by the matrix material in the form of a slurry of the ceramic itself or as a precursor material, the infiltrated fibre tape sections are successively stacked and pressed wet to achieve intermeshing of the tape sections, compacted, dried and hot pressed. The invention also relates to the use of said composite as a self-lubricating material for dry sliding applications, especially on metals.

REFERENCES:
patent: 4925815 (1990-05-01), Tani et al.
patent: 5376599 (1994-12-01), Oshima et al.
K. Sato, et al., Frabrication of Silicon Nitride Based Composites by Impregnation with Perhydropolysilazane, 100 (1992) Apr., No. 4, pp. 450-453, Journal of the Ceramic Society of Japan, International Edition.
H. Kodama, et al., Silicon Carbide Monofilament-Reinforced Silicon Nitride or Silicon Carbide Matrix Composites, 72 (1989) Apr., No. 4, pp. 551-558, Journal of the Aermican Ceramic Soceity.
K.M. Prewo, et al., Fiber Reinforced Glasses and Glass-Ceramics for High Performancy Applications, vol. 65, No. 2 (1986), pp. 305-313, Ceramic Bulletin. (no month).

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