毕业论文(设计)-《超音速火焰喷涂WC–Co涂层的磨粒磨损性能研究》.doc

PAGE PAGE I - PAGE I - JIUJIANG UNIVERSITY 毕 业 设 计 题 目 超音速火焰喷涂WC – Co涂层的 磨粒磨损性能研究 英文题目Seattle Flame Spray WC - Co Coating Of Particle Attrition Performance Study 院 系 机械与材料工程学院 专 业 焊接技术及自动化 姓 名 XX 年 级 指导教师 年十二月 摘 要 利用超音速火焰喷涂工艺制备了WC-Co涂层，测定了涂层孔隙率、显微硬度及干摩擦磨损过程爱中涂层材料失重，得出涂层干摩擦因数随时间的变化系，分析了涂层摩擦磨损机制。结果表明，WC-Co涂层致密，平均孔隙率为1.29%，显微硬度达1140HV(测试载荷2.94N)，干摩擦条件下材料失重低于电镀Cr镀层2个数量级；摩擦初期，干摩擦因数迅速增加，主要磨损特征是粘结相富Co区的犁沟切削，摩擦中后期，摩擦副间实际接触面积增E大，摩擦因数变化较小，磨损趋于稳定WC-Co涂层的主要磨损机制是疲劳磨损和犁沟切削。 【关键词】超音速火焰喷涂；WC-Co涂层；磨粒磨损 目 录 前言········································································1 绪论································································2 1.1 引言··································································2 1.2超音速喷涂技术原理····················································2 1.3超音速火焰喷涂涂层性能及特点··········································3 1.3.1超音速火焰喷涂涂层性能··········································4 1.3.2超音速火焰喷涂特点··············································5 1.4超音速喷涂的工艺控制··················································5 1.4.1超音速火焰喷涂（HVOF）工艺控制·································· 5 1.4.2超音速空气喷涂（HVAF）工艺控制·································· 6 1.4.3超音速等离子弧喷涂工艺控制······································6 1.5 超音速火焰喷涂技术的发展和必威体育精装版研究及应用·····························7 1.5.1超音速火焰喷涂技术的发展历史····································7 1.5.2超音速火焰喷涂技术的必威体育精装版研究····································8 1.5.3超音速火焰喷涂技术的必威体育精装版应用····································9 1.6 关于HVOF喷涂涂层结构涂层研究······································10 1.6.1关于喷涂过程的粒子束行为·······································10 1.6.2关于纳米结构涂层的形成过程与机理·······························11 1.6.3关于影响HVOF喷涂层的因素及机理研究·························· 12 1.7 本文研究的主要内容及意义················