Composites for wear

Details Composites for wear Composites for wear

C - Chemistry, Metallurgy

04

B

C04B 35/83 (2006.01) C04B 35/645 (2006.01) C04B 35/80 (2006.01)

Patent

CA 2145706

The invention discloses a long carbon fibre reinforced ceramic matrix composite in which the matrix is an en- gineering ceramic, characterised in that the engineering ceramic comprises Al2O3 and Y2O3 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 uni- formly 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, cha- racterised 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.

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