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Friction material

A technology of friction materials and friction adjustment materials, which is applied to friction linings, gear transmission mechanisms, and other chemical processes. Excellent dynamic efficiency and wear resistance

Active Publication Date: 2018-06-08
NISSHINBO BRAKE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, in the friction material of Patent Document 1, there is a problem that when a large amount of zirconia is added, the wear resistance after being subjected to a history of high temperature and high load tends to decrease.
[0020] In the case of Patent Document 2, by using stabilized zirconia stabilized into cubic crystals, the abnormal volume change of zirconia can be suppressed, and the decrease in wear resistance can be suppressed. Oblique crystal zirconia will cost more than expensive stabilized zirconia

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～20

[0073] [Methods of Manufacturing Friction Materials of Examples 1-20 and Comparative Examples 1-13]

[0074] The friction material compositions having the compositions shown in Table 1, Table 2, and Table 3 were mixed for 5 minutes with a Loedige mixer, and preliminarily molded by pressing at 30 MPa for 10 seconds in a molding die. This preliminary molded product was superimposed on a steel liner that had been washed, surface-treated, and coated with an adhesive material in advance, and molded in a thermoforming mold at a molding temperature of 150°C and a molding pressure of 40 MPa for 10 minutes. , and then heat-treated (post-cured) at 200° C. for 5 hours, and ground to form a friction surface, and disc brake pads for cars were produced (Examples 1-20, Comparative Examples 1-13).

[0075] Table 1

[0076]

[0077] Table 2

[0078]

[0079] table 3

[0080]

[0081] Regarding the obtained friction material, the braking effect at high speed and high load, the stabi...

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Abstract

The present invention addresses the problem of providing a friction material used in disc brake pads, obtained by molding an NAO type friction material composition that does not contain a copper component, which has good wear resistance after being subjected to a history of high temperatures and high loads, and which has a highly stable braking effect. In order to solve such problem, for a composition for friction material molding, used is a composition comprising: with respect to the total amount of the friction material composition, 10 to 40 wt% of monoclinic zirconium oxide having an average particle size of 1 to 8 [mu]m, serving as an inorganic friction modifier; with respect to the total amount of the friction material composition, 1.5 wt% or more of resilient graphitic carbon, serving as a carbonaceous lubricant; and with respect to the total amount of the friction material composition, 2 to 8 wt%, in total, of calcined coke and said graphitic carbon, in which the ratio by weightof said resilient graphitic carbon and said calcined coke is 4:6 to 8:2.

Description

technical field [0001] The present invention relates to a friction material used in a disc brake pad obtained by molding a friction material composition of NAO (Non-Asbestos-Organic, non-asbestos-organic) material not containing copper. Background technique [0002] Conventionally, a disc brake is used as a brake device for a car, and a disc brake pad obtained by affixing a friction material to a metal base member is used as the friction member. [0003] Friction materials used in disc brake pads are mainly classified into the following three types. [0004] <Semi-Metallic Friction Material> [0005] A friction material containing 30% by weight or more and less than 60% by weight of steel fibers as a fiber base material based on the total amount of the friction material composition. [0006] <Metal-less friction material> [0007] A friction material that contains steel fibers in a part of the fibrous base material and contains steel fibers in an amount of les...

Claims

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Application Information

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IPC IPC(8): C09K3/14F16D69/02
CPCF16D69/026C09K3/149F16D69/027C09K3/1436C09K3/1463F16D2200/0073
Inventor 矢口光明梶真也岩井友美
Owner NISSHINBO BRAKE INC