| 摘要 |
PURPOSE: A fiction material having a first or lower layer comprising a fibrous base material and a second or top layer comprising at least one type of friction modifying particles is provided to obtain high coefficient of friction characteristics, extremely high heat resistance, improved strength, wear resistance and noise resistance. CONSTITUTION: The friction material comprises a first layer comprising a fibrous base material, and a second layer comprising at least one type of friction modifying particle on a top surface of the fibrous base material, the second layer having an average thickness of about 30-200μm, wherein the top layer has a permeability lower than the first layer, wherein the layer of the friction modifying particles has a thickness of about 60 to about 100μm, wherein the top layer has a lower permeability in the radial direction and a lower permeability in the normal direction than the first layer, wherein the friction modifying particles have an average diameter size from about 0.1 to about 80 microns, wherein the friction modifying particle have an average diameter size from about 0.5 to about 20 microns, wherein the fibrous base material has an average voids volume from about 50% to about 85%, wherein the friction modifying particles comprise silica particles, wherein the friction modifying particles comprise a mixture of carbon particles and silica particles, wherein the friction modifying particles comprise metal oxides, wherein the friction modifying particles comprise nitrides, wherein the friction modifying particles comprise carbides, wherein the fibrous base material comprises a fabric material, wherein the fibrous base material is a nonwoven fibrous material, wherein the fibrous base material is a woven fibrous material, wherein the fibrous base material comprises from about 15 to about 25% cotton, about 40 to about 50% aramid fibers, 10 to about 20% carbon fibers, 5 to about 15% carbon particles, and about 5 to about 15% celite, and wherein the fibrous base material comprises about 10 to about 50%, by weight, of a less fibrillated aramid fiber; about 10 to about 35%, by weight, of activated carbon particles; about 5 to about 20%, by weight, cotton fibers, about 2 to about 15%, by weight, carbon fibers; and, about 10 to about 35%, by weight of a filler material. |
