Fibrous lining material comprising a primary layer having less fibrillated aramid fibers and synthetic graphite and a secondary layer comprising carbon particles
AssigneeBorg-Warner Automotive, Inc.
InventorsRobert C. Lam, Marc A. Yesnik, Yih-Fang Chen
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Abstract
The present invention relates to a fibrous base material comprising a primary layer of less fibrillated aramid fibers, synthetic graphite and at least one filler material, and a secondary layer of carbon particles on at least one surface of the fibrous base material for use in a non-asbestos friction material. 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 good "break-in" and durability characteristics.
Claims26
A fibrous base material for use in a non-asbestos friction 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 on at least one surface of the fibrous base material.
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 carbon particles, impregnating the 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.