热处理工艺对Ni-P-PTFE复合镀层组织与性能的影响  

Influence of heat treatment on microstructure and properties of Ni-P-PTFE electroless composite coating

作　　者：谢华[1] 陈增晖[1] 陈晓[1] 

机构地区：[1]福州大学机械工程与自动化学院,福建福州350002

出　　处：《金属热处理》2009年第7期53-57,共5页Heat Treatment of Metals

基　　金：福建省科技厅重点项目(2005H03)

摘　　要：采用扫描电镜、X射线衍射、差热分析研究了热处理对Ni-P-PTFE(聚四氟乙烯)化学复合镀镀层组织的影响,并研究了镀层的磨损性能。结果表明,经400℃×1 h处理后,PTFE的挥发主要发生在镀层的表层,内部的PTFE含量变化很小;镀态条件下,镀层为非晶态,经400℃×1 h处理晶化后生成Ni相及Ni3P相。Ni-P-PTFE复合镀层的晶化起始温度和峰值温度都高于Ni-P镀层。Ni-P-PTFE复合镀层的激活能为235 kJ/mol,与Ni-P镀层的激活能差别不大。镀层摩擦系数在PTFE加入量为8 mL/L时最小,同时镀层磨损量最小;热处理后,Ni-P-PTFE复合镀层表现出较好的耐磨性和较小的摩擦系数。The influence of heat treatment on microstructure of Ni-P-PTFE electroless composite coating was analyzed with SEM, XRD and DSC,and wear resistance of the coating were studied. The results show that the volatilization of the PTFE takes place mainly in the surface layer and the change of interior PTFE content is small after heat treatment at 400 ℃ for 1 h. The coating as deposited presents amorphous, crystallization completes after heat treatment at 400 ℃ for 1 h, and Ni, Ni3 P phases are formed. The crystallization onset temperature and the peak temperature of the Ni-P-PTFE composite coating are higher than those of the Ni-P coating, and the crystallization activation energy of Ni-P-PTFE composite coating is 235 kJ/mol, which is comparative with that of Ni-P coating. The friction coefficient and the wear loss are the least when the adding amount of PTFE is 8 mL/L. Compared with the Ni-P coating, Ni-P-PTFE composite coating shows better wear resistance and the lower friction coefficient under different heat treating temperatuer.

关 键 词：化学复合镀 聚四氟乙烯(PTFE) 显微组织 耐磨性 

分 类 号：O794[理学—晶体学] TG174.41[金属学及工艺—金属表面处理]