摘要
为提高锡基巴氏合金的自润滑性能和耐磨性,将镀铜石墨(Cu-Gr)粉与锡基巴氏合金粉末混合,采用激光熔覆的方法在20钢基体表面制备锡基巴氏合金自润滑复合熔覆层。结果表明,激光熔覆后,通过铜包裹的石墨在复合熔覆层中仍以单质的形式存在;Cu-Gr/巴氏合金复合熔覆层均匀致密,表面无裂纹、气孔等缺陷。熔覆层主要由α-Sn固溶体相、硬质点相SnSb和Cu_(6)Sn_(5)相组成。由于镀铜石墨的添加,复合熔覆层的组织明显细化。复合熔覆层的显微硬度约为43.19 HV,相较于巴氏合金熔覆层提高了27%。由于显微硬度的增加和石墨的自润滑性能,复合熔覆层的摩擦系数和磨损率均有下降,分别为0.359和1.36×10^(-6)mm/(N^(-1)·m^(-1))。Cu-Gr的添加能有效改善巴氏合金的自润滑性能和耐磨性能。
A Babbitt self-lubricating composite coating was successfully fabricated on 20 steel substrate by laser cladding through the mixed powers of Cu-plated graphite(Cu-Gr)composite powders and Babbitt alloy powders,aiming at improving wear resistance of Babbitt coating.The results showed that the self-lubricating phase(graphite)coated by the Cu still remains elemental in the composite coating after laser cladding.Both Babbitt coating and Cu-Gr/Babbitt composite coating are uniform and density,without pore,cracks or any other defects.They are mainly composed ofα-Sn solid solution phase,Cu_(6)Sn_(5) and SnSb precipitated phases.The grains are obviously refined for the composite coating due to the heterogeneous nucleation.The microhardness for the Cu-Gr/Babbitt composite coating are 43.19 HV,which is much higher than that of the Babbitt coating with the value of 32.4 HV.With respect to the increase in the microhardness,Cu-Gr/Babbitt composite coating also exhibits a low friction coefficient and wear rate with the value of 0.359 and 1.36×10^(-6 )N·m.The addition of Cu-Gr can effectively improve the self-lubricating and wear behavior of Babbitt alloys.
作者
高强
吴玉厚
赵德宏
王琳
Gao Qiang;Wu Yuhou;Zhao Dehong;Wang Lin(School of Mechanical Engineering,Shenyang Jianzhu University,Shenyang 110168,Liaoning,China;Mechanics institute,Shenyang Institute of Engineering,Shenyang l10136,Liaoning,China;National and Local Joint Engineering Laboratory of High-grade Stone Numerical Control Machining Equipment and Technology,Shenyang 110168,Liaoning,China)
出处
《应用激光》
CSCD
北大核心
2023年第10期1-9,共9页
Applied Laser
基金
辽宁省教育厅一般项目(LJKZ0569)、辽宁省教育厅青年项目(LJKQZ20222264)。
