Study On The New Type Of High-performance Friction Material

Based on consulting and analyzing lots of internal and overseas documents about friction materials, the paper takes auto disk brake-shoes of self-development as research object, and discusses the influence of content and carding degrees of Kevlar fiber on the performances by research of theory and test, at the same time also the mechanism of the friction and wear, attains the anticipated results. The paper applies the bases of theory and test for the research and application of the new type of friction material.At first the paper introduces the developing status quo and the open question of friction material inland and overseas, showing the friction materials, which are characterized by nonmetal, nonfibers, resistance to elevated temperature, low noise, are the trends of development in the whole world for the future.The following has been finished in this paper: first, taking disc brake-shoes of self-development as research object, designing the structure of the friction material; second, according to the research object and the performance of material, defining the pressing and heat-treat process of test sample; third, proving that the Kevlar fiber has better performance of friction and wear than several fibers usually practiced by match tests; fourth, designing the formula by orthogonal test, and analyzing the influence of content and carding degree of Kevlar fiber on friction material, also the action of carding degrees on the inside microstructure of the friction material by test data; fifth, making variance analysis and formula optimization based on the constant speed test results, proving that the formula after optimization has super performance of friction and wear specially the resistance to elevated temperature by the constant speed test and the bench test, and having extensive applicability; sixth, analyzing the microscopic patterns of superficial and inner layers before and after friction, and discussing the mechanism of friction and wear of this new type of material.The paper declares the further research direction of the new type of friction material, especially of the study on the mechanism of friction and wear of Kevlar fiber, also of the research on the mechanism of noise reduction of the Kevlar fiber and flaky vermiculite, this research will have important value.