Friction elements of composite carbon-carbon material and of differential texture
AssigneeLe Carbone Lorraine
InventorsChristophe Bommier, Jean-Louis Chareire
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Abstract
A multi-layer friction element is disclosed consisting of carbon-carbon composite material comprising a structure layer of so-called "coarse" texture comprising segments of rovings and at least one friction layer of so-called "fine" texture comprising fibre segments. A method also is disclosed for producing the friction element by preparation of a fibrous substrate by introducing segments of roving and/or fibers into a mould preferably by means of a distribution apparatus. Further disclosed is an apparatus for automatically obtaining a fibrous substrate of predetermined texture.
Claims12
A multi-layer friction element comprising a structure layer of carbon-carbon composite material having at least one face covered with a friction layer (2) of carbon-carbon composite material rigid with said structure layer, the structure layer being obtained from a fibrous substrate (5g) of coarse texture having a mean pore diameter in excess of 100 .mu.m and comprising rovings segments of elementary carbon fiber or carbon fiber precursor, said roving segments containing at least 1000 elementary fibers, and the friction layer (2) being obtained from a fibrous substrate of fine texture having a mean pore diameter less than 50 .mu.m and comprising fiber segments (6) of elementary carbon fiber or carbon fiber precursor which are randomly distributed, said roving segments containing at least 10 times the number of elementary fibers as said fiber segments.
Dependencies are inferred from the claim text.