Wet friction material with pitch carbon fiber
AssigneeBorgWarner Inc.
InventorFeng Dong
Life of this patent
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Abstract
A friction material includes a fibrous base material having at least one type of petroleum pitch-based carbon fiber.
Claims14
A friction material comprising a fibrous base material comprising, by weight percent:
- about 50 to about 60% aramid fibers;
- about 3 to about 10% silica filler;
- about 20 to about 30% graphite;
- about 10 to about 20% petroleum pitch-based carbon fibers;
- and,
- a secondary layer comprising carbon particles and a silica filler material.
A friction material comprising a fibrous base material comprising, by weight percent:
- about 50 to about 60% aramid fibers;
- about 3 to about 10% silica filler;
- about 20 to about 30% graphite;
- about 10 to about 20% petroleum pitch-based carbon fibers;
- and
- a secondary layer comprising carbon particles and a silica filler material, wherein the carbon particles are present at about 1–3 lbs. and the silica friction material is present at about 2–4 lbs. based on a basis weight of lbs/3000 square feet.
A friction material comprising a primary layer comprising a fibrous base material and a secondary layer comprising of petroleum pitch-based carbon fibers deposited on the primary layer, the petroleum pitch-based carbon fibers having an average length of about 10 to about 150 microns.
A friction material comprising a primary layer comprising a fibrous base material and a secondary layer deposited on the primary layer, comprising petroleum pitch-based carbon fibers that are present at about 9 lbs. based on a basis weight of lbs./3000 square feet;
- the petroleum pitch-based carbon fibers having an average length of about 150 to about 250 microns.
Dependencies are inferred from the claim text.