铜基粉末冶金刹车材料支撑背板表面镀层对防渗碳性能的影响  

Effect of coating on steel back of Cu-based powder metallurgy brake materials on carburizing resistance

作　　者：曹文明 姚萍屏[1] 周海滨 赵林 许良 肖叶龙 CAO Wenming;YAO Pingping;ZHOU Haibin;ZHAO Lin;XU Liang;XIAO Yelong(Powder Metallurgy Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金研究院,长沙410083

出　　处：《粉末冶金材料科学与工程》2020年第6期538-544,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51475476)。

摘　　要：采用3种具有不同表面镀层的支撑背板(45#钢)制备铜基粉末冶金刹车材料,对比研究表面镀层对支撑背板防渗碳、抗热疲劳以及支撑背板与摩擦材料结合性能的影响。结果表明:表面镀Ni层不能防止加压烧结时石墨垫板向支撑背板渗碳,而表面镀Cu或镀Cu+Ni均可有效防止支撑背板渗碳。在热疲劳条件下,表面镀Ni的支撑背板由于渗碳而导致强度和硬度提高,与铜基摩擦材料的结合强度较好,但容易出现翘曲和开裂;表面镀Cu和镀Cu+Ni的支撑背板均不易翘曲变形和开裂,其中镀Cu支撑背板与摩擦材料的结合强度较差,表面镀Cu+Ni的支撑背板与摩擦材料间的结合强度较高。Three kinds of steel back(45#steel)with different surface coatings were used to prepare Cu-based powder metallurgy brake materials.The effects of surface coatings on the anti carburizing and thermal fatigue resistance of the steel back and the bonding properties between the steel back and friction materials were studied.The results show that Ni coating on the surface can not prevent the carburization of the graphite backing plate to the steel back during pressure sintering,while the surface plating of Cu or Cu+Ni can effectively prevent the carburization of the steel back.Under the condition of thermal fatigue,the strength and hardness of the steel back coated with Ni are improved by carburizing,and the bonding strength with friction material is good,but it is easy to warp and crack.The back plates coated with Cu and Cu+Ni are not easy to warp,deform and crack.The bonding strength between Cu plated back plate and friction materials is poor.The bonding strength between the steel back coated with Cu+Ni and the friction material is good.

关 键 词：粉末冶金 刹车材料 支撑背板 表面镀层 渗碳 

分 类 号：TG142.1[一般工业技术—材料科学与工程]