基于柔性金属布技术的梯度WC增强NiCrBSi合金涂层的制备及性能  

Preparation and Performance of Gradient WC Reinforced NiCrBSi Alloy Coating Based on Flexible Metallic Cloth Technique

作　　者：李豪赛 贾云飞 轩福贞[1] LI Haosai;JIA Yunfei;XUAN Fuzhen(Key Laboratory of Pressure System and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, Chin)

机构地区：[1]华东理工大学机械与动力工程学院承压系统与安全教育部重点实验室,上海200237

出　　处：《机械工程材料》2018年第6期59-64,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金青年基金资助项目(51605164);上海市扬帆计划项目(16YF1402300);上海市晨光计划项目(16CG34);中央高校基本科研业务费专项资金资助项目(222201718005)

摘　　要：采用折叠辊压技术制备NiCrBSi合金粉和WC合金粉体积比i分别为1∶1,2∶1,5∶1,10∶1,20∶1的WC合金增强NiCrBSi合金柔性金属布,将i为20∶1的金属布置于316L不锈钢基体上,再叠放一层其他体积比的金属布,采用真空钎焊制备得到4种梯度WC增强NiCrBSi合金涂层,研究了涂层中WC颗粒的分布以及涂层的耐磨性和拉伸性能。结果表明:当金属布厚度在0.5mm、钎焊保温时间为10min时成功制得梯度涂层,随着上层金属布中i的增大,涂层中WC颗粒分布的梯度斜率降低;梯度涂层明显提高了基体的耐磨性,且随着梯度斜率的增加,涂层的耐磨性逐渐增强,抗拉强度降低,在拉伸过程中,梯度斜率较大的涂层中会产生多条贯穿裂纹。WC-reinforced NiCrBSi alloy flexible metal cloth containing NiCrBSi alloy powder and WC alloy powder with volume ratios i of 1∶1,2∶1,5∶1,10∶1 and 20∶1 was prepared by the folding roller press technique.The metal cloth with i equal to 20∶1 was placed on a 316 Lstainless steel substrate,and stacked with another layer of metal cloth with other i values,and then four gradient WC reinforced NiCrBSi alloy coatings were obtained by vacuum brazing.The distribution of WC particles in the coatings and the wear resistance and tensile properties of the coatings were studied.The results show that the gradient coatings were prepared successfully by controlling the thickness of metal cloth at 0.5 mm and brazing holding time of 10 min.The gradient slope characterizing the distribution of WC particles in coatings decreased with increasing i in the upper metal cloth.The gradient coatings improved the wear resistance of the substrate obviously.The wear resistance of the coating increased while the tensile strength decreased with increasing gradient slope.During the tensile process,multiple penetration cracks were produced in the coating with a relatively large gradient slope.

关 键 词：梯度 WC增强NiCrBSi合金 钎焊 摩擦磨损 金属布 

分 类 号：TH142.2[一般工业技术—材料科学与工程]