Carbon deposit friction lining material
AssigneeBorg-Warner Automotive, Inc.
InventorsRobert C. Lam, Yih-Fang Chen
Life of this patent
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Abstract
The present invention relates to a friction material comprising a fibrous base material primary layer of less fibrillated aramid fibers, synthetic graphite and at least one filler material, and a secondary layer of a mixture of carbon particles and at least one retention aid coated on at least one surface of the primary layer. In certain embodiments, the fibrous base material is impregnated with a phenolic or phenolic-based resin material, including, for example, a mixture of a phenolic resin and a silicone resin to form a friction material having high heat resistance and high friction durability characteristics.
Claims32
A non-asbestos friction material comprising a fibrous base material impregnated with at least one curable resin, the fibrous base material comprising a primary layer of a plurality of less fibrillated aramid fibers having a freeness of at least about 450 on the Canadian Standard Freeness (CSF) index;
- synthetic graphite, and, at least one filler material;
- and a secondary layer comprising carbon particles and at least one retention aid on at least one surface of the primary layer.
A process for producing a non-asbestos friction material comprising mixing less fibrillated aramid fibers having a freeness of at least about 450 on the Canadian Standard Freeness (CSF) index with synthetic graphite and at least one filler to form a fibrous base material, coating at least one surface of the fibrous base material with a mixture of carbon particles and at least one retention aid, impregnating the carbon particle coated fibrous base material with at least one phenolic resin or modified phenolic resin, and thereafter curing the impregnated fibrous base material at a predetermined temperature for a predetermined period of time.
Dependencies are inferred from the claim text.