Friction material composition, and friction material and friction member each obtained using friction material composition
A friction material composition containing a binder, an organic filler, an inorganic filler and a fibrous base material, wherein the friction material composition either contains no copper as an element or has a content of copper as an element that does not exceed 0.5% by mass, contains α-alumina and γ-alumina in a mass ratio within a range from 1:20 to 1:5, contains a silicone-containing phenol resin, contains 20 to 35% by mass of a titanate salt, contains 3 to 7% by mass of a graphite having a median diameter of 1 to 30 μm, and contains antimony trisulfide.
1. A friction material composition comprising a binder, an organic filler, an inorganic filler and a fibrous base material, wherein:
the friction material composition either comprises no copper as an element or has a content of copper as an element that does not exceed 0.5% by mass,
the friction material composition comprises α-alumina and γ-alumina in a mass ratio within a range from 1:6 to 1:less than 8,
a total amount of the α-alumina and the γ-alumina is within a range from 3.5 to 5% by mass,
a median diameter of the γ-alumina is within a range from 5 to 28 μm
the friction material composition comprises a silicone-containing phenol resin,
the friction material composition comprises 22 to 30% by mass of a titanate salt,
the friction material composition comprises both potassium titanate and lithium potassium titanate as the titanate salt,
the friction material composition comprises 3 to 7% by mass of a graphite having a median diameter of 1 to 30 μm, and
the friction material composition comprises antimony trisulfide in an amount within a range from 0.5 to 2% by mass.
2. The friction material composition according to claim 1 ,
comprising 1 to 4% by mass of a zinc powder.
3. The friction material composition according to claim 1 , comprising zirconium oxide.
4. A friction material obtained by molding the friction material composition according to claim 1 .
5. A friction member comprising the friction material according to claim 4 and a backing plate integrated with the friction material.
6. A friction material composition, comprising:
a binder comprising a silicone-containing phenol resin;
an organic filler;
an inorganic filler comprising:
α-alumina and γ-alumina in a mass ratio within a range from 1:6 to 1:less than 8, a total amount of the α-alumina and the γ-alumina being within a range from 3.5 to 5% by mass, wherein a median diameter of the γ-alumina is within a range from 5 to 28 μm,
22 to 30% by mass of a titanate salt,
titanate salt comprising both potassium titanate and lithium potassium titanate,
3 to 7% by mass of a graphite having a median diameter of 1 to 30 μm, and
0.5 to 2% by mass of antimony trisulfide; and
a fibrous base material,
wherein the friction material composition either comprises no copper as an element or has a content of copper as an element that does not exceed 0.5% by mass.
7. The friction material composition according to claim 6 ,
comprising 1 to 4% by mass of a zinc powder.
8. The friction material composition according to claim 6 , comprising zirconium oxide.
9. A friction material obtained by molding the friction material composition according to claim 6 .
10. A friction member comprising the friction material according to claim 9 and a backing plate integrated with the friction material.