| In the process of emergent brake,friction produces a large amount of heat that increases the temperature of the friction surface,and occurs physical reaction and chemical reaction of friction materials,which reduce the stability of friction characteristics.In this paper,the common resin,boron modified phenolic resin and melamine modified resin were used as binder,and lignin fiber,ceramic fiber,and carbon fiber were used as reinforcing fiber.The common resin,boron modified phenolic resin and melamine modified resin were used as binder,and lignin fiber,ceramic fiber,and carbon fiber were used as reinforcing fiber to improvement of the stability of high temperature friction properties of automotive brake linings.The friction material of automotive brake linings was prepared by cold briquetting process,heat-squeeze solidifying technique and heat treatment processes.This paper mainly studies the influence of modified resin and reinforcing fiber on the friction properties of automobile brake lining friction material,which provides theoretical and experimental basis for research of new friction materials.In this paper,the finite element method of ABAQUS is used to analyze the thermal-mechanical coupling process of automotive brake lining friction material in the braking process.The analysis showed that the distribution of temperature field and stress field of friction material can be affected by different kinds of resin and reinforcing fiber.When reinforcing fiber is same,the highest temperature and the maximum stress of modified melamine resin friction material is lower than that of boron modified phenolic resin friction materials and ordinary phenolic resin friction materials.When resin is same,the highest temperature and the maximum stress of lignin fiber reinforced friction material was lower than that of ceramic fiber reinforced friction material and carbon fiber reinforced friction material.According to the comprehensive analysis,the highest temperature and the maximum stress of lignin fiber reinforced melamine modified resin friction material are relatively lower,and braking performance is better under the same braking condition.The friction and wear properties and mechanical properties of automotive brake lining friction materials with different kinds of resins and reinforcing fibers were analyzed,and the microstructure of friction material was observed by SEM.The experimental result indicated that boron modified phenolic resin and melamine modified resin can effectively improve the mechanical properties of automotive brake linings,but the heat resistance of melamine modified resin was higher than that of boron modified phenolic resin and phenolic resin,it can reduce thermal decay of friction material,improve stability of friction coefficient and reduce wear rate.In addition,the reinforcing fiber makes friction properties of friction materials more stable.Among them,the fiber reinforcement effect of lignin fiber in melamine modified resin friction material is the best.According to the comparison of simulation results and experimental results show that the comprehensive performance of lignin fiber reinforced melamine modified resin friction material is excellent. |
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