초록

One exemplary embodiment includes a friction material including a base including a plurality of fibers. The base including an engagement surface, and a plurality of binder particles and friction modifying particles at the engagement surface.

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1. A friction material comprising a base material comprising a plurality of fibers, the base material having an engagement surface, a plurality of binder particles and a plurality of friction modifying particles at the engagement surface of the base material, the friction modifying particles having

1. A friction material comprising a base material comprising a plurality of fibers, the base material having an engagement surface, a plurality of binder particles and a plurality of friction modifying particles at the engagement surface of the base material, the friction modifying particles having a particle size less than the binder particles, and the weight ratio of friction modifying particles to binder particles ranging from 50/50 to 90/10 and wherein a plurality of the friction modifying particles are bound to each binder particle. 2. A friction material as set forth in claim 1 wherein the binder particles comprise flowable uncured particles. 3. A friction material as set forth in claim 1 wherein the binder particles have a generally spherical shape. 4. A friction material as set forth in claim 1 wherein the binder particles are irregular shaped. 5. A friction material as set forth in claim 1 wherein the binder particles are cured and wherein the friction modifying particles are bound to the binder particles. 6. A friction material as set forth in claim 1 wherein the binder particles comprise at least one of a silicone, phenolic, polyamide, or a polyimide polymer. 7. A friction material as set forth in claim 1 wherein the binder particles comprises a polymer. 8. A friction material as set forth in claim 1 wherein the friction modifying particles comprise at least one of carbon particles, oxide particles, or silica or cashew oil modified particles. 9. A friction material as set forth in claim 4 wherein the binder particles have a size ranging from 1.8-40 microns. 10. A friction material as set forth in claim 1 wherein the friction modifying particles have a size ranging from 1-25 microns. 11. A friction material as set forth in claim 1 wherein the binder particles comprise a phenolic resin and wherein the friction modifying particles comprise silica. 12. A friction material as set forth in claim 11 wherein the binder particles are cured. 13. A friction material as set forth in claim 1 wherein the friction modifying particles are bound to the binder particles and wherein the binder particles having the friction modified particles bound thereto cover approximately 2 to 30 percentage of the engagement surface of the base material. 14. A friction material as set forth in claim 1 wherein the plurality of binder resin particles and a plurality of friction modifying particles bound thereto are discretely located at the engagement surface providing porosity at the engagement surface. 15. A friction material comprising a plurality of irregular shaped cured resin binder particles having a plurality of friction modifying particles bound thereto, the friction modifying particles having a size less than the binder particles, wherein the binder particles comprise at least one of a silicone polymer, a phenolic polymer, a polyamide or a polyimide resin, and wherein the friction modifying particles comprise at least one of carbon particles, oxide particles, silica particles or cashew oil modified particles; and wherein a plurality of the friction modifying particles are bound to each irregular shaped cured resin binder particle. 16. A friction material as set forth in claim 15 further comprising a base material comprising a plurality of fibers, the base material having an engagement surface, a wherein the plurality of irregular shaped cured resin particles having a plurality of friction modifying particles bound thereto are discretely located at the engagement surface providing porosity at the engagement surface. 17. A friction material as set forth in claim 1 wherein the friction modifying particles do not include silica. 18. A friction material as set forth in claim 1 wherein the friction modifying particles are cashew oil modified particles. 19. A friction material as set forth in claim 1 wherein the base material defines pores ranging in mean average size from about 2.0 to about 25 microns in diameter. 20. A friction material as set forth in claim 1 wherein the base material defines pores ranging in mean average size from about 2.5 to about 8 microns in diameter and wherein the friction material comprises air voids of at least about 50%. 21. A friction material as set forth in claim 1 wherein the binder particles are not cured. 22. A friction material as set forth in claim 1 wherein the base material comprises a diatomaceous earth filler. 23. A friction material as set forth in claim 1 wherein the binder particles comprise polyamide polymer. 24. A friction material as set forth in claim 1 wherein the friction material has an open pore structure. 25. A friction material as set forth in claim 1 wherein the base material comprises 10 to 50%, by weight of a less fibrillated aramid fiber. 26. A friction material as set forth in claim 15 wherein the base material comprises 10 to 50% by weight of a less fibrillated aramid fiber. 27. A friction material as set forth in claim 26 wherein the less fibrillated aramid fiber has a Canadian Standard Freeness of 530-650. 28. A friction material comprising a base material comprising a plurality of fibers, the base material having an engagement surface, a plurality of binder particles and a plurality of friction modifying particles at the engagement surface of the base material, the friction modifying particles having a particle size less than the binder particles, and the weight ratio of friction modifying particles to binder particles ranging from 50/50 to 90/10 wherein a plurality of the friction modifying particles are bound to each binder particle, wherein the binder particles comprise flowable uncured particles wherein the binder particles are irregular shaped and wherein the binder particles comprise at least one of a silicone, polyamide, or a polyimide polymer and wherein the friction material further comprises a liquid resin that binds the uncured binder particles to the friction modifying particles. 29. A friction material comprising a base material comprising a plurality of fibers, the base material having an engagement surface, a plurality of binder particles and a plurality of friction modifying particles at the engagement surface of the base material, the friction modifying particles having a particle size less than the binder particles, and the weight ratio of friction modifying particles to binder particles ranging from 50/50 to 90/10 and wherein a plurality of the friction modifying particles are bound to each binder particle wherein the binder particles are cured wherein the binder particles are irregular shaped and wherein the binder particles comprise at least one of a silicone, polyamide, or a polyimide polymer. 30. A friction material as set forth in claim 1 wherein the binder particles comprise a plurality of discrete binder particles have a size ranging from 1.8-40 microns.