Friction material composition, friction material using the same, and friction member
View Patent ↗Provided is a friction material composition comprising: a binder; a fibrous base material; an abrasive material; an inorganic filler; and an organic filler, wherein the friction material composition further comprises: at least one selected from the group consisting of zinc, a cellulose fiber as the fibrous base materials and a flame retardant fiber as the fibrous base materials; an iron-based fiber as the fibrous base material in an specified amount; and an inorganic abrasive material having a Mohs hardness of 8 or higher and a particle size of 1 μm or larger as the abrasive material in an amount of 1 wt % or less. The present invention can provide a friction material composition which is less destructive to facing materials compared to conventional products, which has a high friction coefficient upon braking when used in repeated braking during high-speed traveling, and which is capable of suppressing pad wear and uneven pad wear, in the case that the friction material composition is formed into a brake pad for passenger cars. The present invention can also provide a friction material and a friction member using this friction material composition.
1. A friction material composition comprising:
a binder;
a fibrous base material comprising an iron-based fiber in an amount of 2 to 10 wt %;
an abrasive material comprising an inorganic abrasive material having a Mohs hardness of 8 or higher and a particle size of 1 μm or larger in an amount of 1 wt % or less;
an inorganic filler;
an organic filler comprising cashew dust in an amount of 1 to 10 wt %, wherein the cashew dust is coated with a rubber in amount of 3 to 17 wt % relative to the amount of the cashew dust; and
zinc.
2. The friction material composition according to claim 1 , wherein the amount of the zinc is within the range of 2 to 5 wt %.
3. The friction material composition according to claim 1 , wherein the fibrous base material further comprises an aramid fiber, in an amount of 1.5 wt % or more.
4. The friction material composition according to claim 1 , wherein the fibrous base material further comprises a flame retardant fiber.
5. The friction material composition according to claim 4 , comprising the flame retardant fiber in an amount of 1 to 10 wt %.
6. The friction material composition according to claim 1 , wherein the fibrous base material further comprises a cellulose fiber.
7. The friction material composition according to claim 6 , comprising the cellulose fiber in an amount of 1 to 10 wt %.
8. The friction material composition according to claim 1 , wherein the abrasive material further comprises activated alumina, and wherein the organic filler further comprises a fluoropolymer.
9. The friction material composition according to claim 8 , wherein the activated alumina is an activated alumina having a specific surface area calculated by a BET method of 150 m 2 /g or larger.
10. The friction material composition according to claim 8 , wherein the activated alumina is γ-alumina.
11. The friction material composition according to claim 8 , wherein the amount of the activated alumina is within the range of 1 to 10 wt % relative to the amount of the friction material composition.
12. The friction material composition according to claim 8 , wherein the fluoropolymer is powder of polytetrafluoroethylene.
13. The friction material composition according to claim 8 , wherein the amount of the fluoropolymer is within the range of 0.3 to 6 wt % relative to the amount of the friction material composition.
14. The friction material composition according to claim 1 , wherein the abrasive material further comprises an additional abrasive material in an amount within the range of 10 to 40 wt %.
15. A friction material obtained by molding the friction material composition according to claim 1 .
16. A friction member formed by integrating the friction material obtained by molding the friction material composition according to claim 1 , and a back metal.