Friction material for brakes
View Patent ↗A non-asbestos friction material includes at least one binder, fiber, lubricant, abrasive and titanate in a range of volume fractions in combination with other materials such as fillers and is substantially free of copper and asbestos.
1. A friction material for a brake comprising:
at least one binder forming approximately 15-20% by volume;
at least one fiber forming 3-8% by volume;
at least one lubricant forming less than 5% by volume;
at least one abrasives forming 17-25% by volume;
at least one titanate forming at least 13% by volume;
other materials forming 29-45% by volume; and wherein the friction material is substantially free of asbestos and copper.
2. The friction material of claim 1 wherein said binder consists essentially of a modified phenolic resin.
3. The friction material of claim 1 wherein said binder comprises a mixture of one or more straight or modified phenolic resin systems.
4. The friction material of claim 1 wherein said binder is not a phenolic resin.
5. The friction material of claim 1 wherein said binder is a mixture of a phenolic resin and a nonphenolic resin.
6. The friction material of claim 1 wherein said fiber is chosen from a group of aramid, polyacrylonitrile (PAN) and cellulose fibers.
7. The friction material of claim 1 wherein said lubricant consists essentially of at least one of metal sulfides, organic lubricants and metal lubricants.
8. The friction material of claim 7 wherein said lubricant is selected from the group consisting essentially of tin sulfides, antimony trisulfide, antimony trioxide, zinc sulfide, copper sulfide, iron sulfides, phthalocyanine, tin powder, and zinc powder.
9. The friction material of claim 7 wherein said lubricant comprises a metal sulfide complex.
10. The friction material of claim 7 wherein said lubricant comprises a combination of a metal sulfide and antimony trisulfide.
11. The friction material of claim 7 wherein said lubricant comprises only antimony trisulfide.
12. The friction material of claim 1 wherein said abrasives are chosen from a group of mineral fibers, zirconia, zircon, zirconium silicate, mica, alumina, ceramic fibers, calcium magnesium silicate, calcium magnesium zirconium silicate, calcium magnesium aluminum silicate, magnesium aluminum silicate, synthetic mineral fibers, silica, silicon dioxide, sand, silicon carbide, iron oxide and Magnesium oxide.
13. The friction material of claim 1 wherein said abrasives consist essentially of at least one of zirconia and zirconium silicate.
14. The friction material of claim 1 wherein said abrasives consist essentially of at least one of iron oxide and magnesium oxide.
15. The friction material of claim 1 wherein said abrasives consist essentially at least one of mineral fibers and alumina.
16. The friction material of claim 1 including less than 10% magnesium oxide.
17. The friction material of claim 1 including less than 5% magnesium oxide.
18. The friction material of claim 1 including less than 2.2% magnesium oxide.
19. The friction material of claim 1 wherein said material is substantially free of magnesium oxide.
20. The friction material of claim 1 wherein said other materials comprise at least one selected from the group consisting of lime, calcium oxide, talc, calcium carbonate, wollastonite, barites, calcium silicate, carbons, friction dust.
21. The friction material of claim 1 wherein said other materials consist essentially of a mixture of wollastonite, lime, barium sulfate, graphite, and friction dusts.
22. The friction material of claim 1 wherein said other materials consist essentially of a mixture of wollastonite, lime, barium sulfate, graphite, rubber, and friction dusts.
23. The friction material of claim 1 wherein the friction material does not include copper, brass, bronze and other copper alloys.
24. The friction material of claim 1 wherein said binder is an unmodified phenolic resin.
25. The friction material of claim 1 wherein said fiber is a fiber of the aramid fiber family only.
26. The friction material of claim 1 that contains substantially no copper in any form.
27. The friction material of claim 1 wherein said friction material is substantially tree of magnesium oxide.
28. The friction material of claim 1 wherein the friction material is substantially free of steel fibers.
29. The friction material of claim 1 wherein
said binder consists essentially of at least one of a straight phenolic resin, a modified phenolic resin, silicone, acrylic, epoxy, and nitrile;
said fiber consists essentially of at least one of aramid fibers, poly acrylonitrile (PAN) fibers, and cellulose fibers;
said lubricant consists essentially of at least one of tin sulfides, atimony trisulfide, antimony trioxide, zinc sulfide, copper sulfide, iron sulfides, phthalocyanine, tin powder, and zinc powder; and
said abrasive consists essentially of at least one of mineral fibers, zirconia, alumina, magnesium oxide, zirconium silicate, silica, silicon dioxide, sand, silicon carbide, mullite, iron oxide, complex mineral silicates such as calcium magnesium silicate, calcium magnesium zirconium silicate, calcium magnesium aluminum silicate, magnesium aluminum silicate, iron oxides of different chemistries, metallic oxides, synthetic mineral fibers, hardwool, slagwool, rockwool, and naturally occurring minerals.
30. The friction material of claim 29 wherein said titanate consists essentially of at least one of hexatitanate and octatitanate.
31. The friction material of claim 30 wherein said other materials consist essentially of at least one of lime, calcium oxide, barytes, graphite, pet coke, desulfurized coke, calcium silicate, powder rubber, recycled rubber, and friction dust.
32. The friction material of claim 1 wherein said titanate consists essentially of at least one of hexatitanate and octatitanate.
33. A brake pad comprising: a backing plate; and a friction pad fixed to the backing plate and fabricated of a friction material, wherein the friction material comprises
at least one binder forming approximately 15-20% by volume;
at least one fiber forming 3-8% by volume;
at least one lubricant forming less than 5% by volume;
at least one abrasives forming 17-25% by volume;
at least one titanate forming at least 13% by volume;
other materials forming 29-45% by volume; and wherein the friction material is substantially free of asbestos, copper and magnesium oxide.