Reib material

Abstract

A friction material is provided with a baked, carbonized organic material as its binder. The friction material has a degree of compression deformation from 0.3% to 2.5% under a load of 4 MPa and a degree of compression deformation from 1.0% to 4.5% under a load of 10 MPa at room temperature. The compression deformation ratio of the degree of compression deformation at 300°C to the degree of compression deformation at room temperature is from 1.0 to 1.5 under a load of 1-10 MPa. The baking carbonization step includes carbonizing an organic material at a temperature from 550° C. to 1300° C. in any atmosphere of vacuum, reducing gas or inert gas, wherein a load is applied to the organic material.

Description

[0001] This application claims priority from Japanese Patent Application No. P. 2005-130046 filed on April 27, 2005, the contents of which are hereby incorporated by reference. technical field [0002] The present invention relates to friction materials for brake linings used in automobiles, rail vehicles, aircraft, industrial machines and the like. Background technique [0003] From the standpoint of energy saving and efficiency, it is desired that the brake be small in size, light in weight and have high quality. In addition, friction materials for brake linings are expected to have good heat resistance durable against high temperature and high load conditions. [0004] Friction materials primarily used in automobiles and rail vehicles are formed from thermosetting resins such as typically phenolic resins used as adhesives. However, since the binder is an organic material, the coefficient of friction may be low at high speeds, the degree of compression deformation may inc...

AI Technical Summary

Problems solved by technology

The problem with the organic friction material in terms of the degree of its compression deformation is that the organic material may melt or decompose at high temperature, the degree of its high temperature deformation may increase too much, and as a result, the organic material may have characteristics such as abnormal friction or drag (not full trip movement) negative effects of

Therefore, for these reasons, organic friction materials are limited in terms of their degree of compression deformation.

On the other hand, a C / C composite friction material formed of an organic material alone may not have such problems, and may be remarkably advantageous in terms of its surrounding temperature conditions, but it has a problem in that, due to its constituent components and Manufactured in such a way that the degree of compression deformation cannot be adequately controlled while maintaining the necessary frictional strength

[0012] In addition, the main reason why the composite material cannot be a high-density product in one baking operation may be due to the fact that the fibers and woven fabrics used as reinforcements in it are stable carbon fibers that do not undergo structural changes in baking, but through the polymers that make it Carbonization of the material (which is about 50% carbonized) the binder may shrink and reduce to about 1 / 2 the volume, and thus the shrunken parts may remain as pores in the composite

Images