摘要
以Ni60合金粉末与WC-10Co4Cr粉末为原料,采用以空气为助燃气体的超音速火焰喷涂工艺制备Ni60/WC-10Co4Cr复合涂层,研究了添加不同质量分数(20%,40%,60%)WC-10Co4Cr涂层的显微组织、耐磨粒磨损性能和耐腐蚀性能,并与电镀硬铬层进行对比。结果表明:Ni60/WC-10Co4Cr复合涂层由镍基固溶体(NiCr)、铬的碳化物(Cr_(23)C_(6)和Cr_(7)C_(3))和硼化物(Cr_(2)B)以及WC组成,涂层与基体结合紧密,孔隙率均低于1%;随着WC-10Co4Cr含量的增加,复合涂层中的硬质WC相含量增加,涂层的硬度升高,磨粒磨损体积损失明显下降,耐磨粒磨损性能提高,自腐蚀电位降低,自腐蚀电流密度增大,耐腐蚀性能下降。添加质量分数60%WC-10Co4Cr的复合涂层的性能最佳,其耐磨性能与电镀硬铬层相当,耐腐蚀性能优于电镀硬铬层,硬度略低于电镀硬铬层;采用该涂层来代替电镀硬铬是可行的。
Ni60/WC-10Co4Cr composite coatings were prepared by high velocity air fuel spraying with air as combustion gas by taking Ni60 alloy powder and WC-10Co4Cr powder as raw materials.The microstructure,abrasive wear resistance and corrosion resistance of the coatings with different mass fractions(20%,40%,60%)of WC-10Co4Cr were studied and were compared with those of the electroplated hard chromium layer.The results show that Ni60/WC-10Co4Cr composite coatings were composed of nickel-based solid solution(NiCr),chromium carbides(Cr_(23)C_(6) and Cr_(7)C_(3)),borides(Cr_(2) B)and WC.The coatings were tightly bonded to the substrate,and the porosity was lower than 1%.With the increase of the content of WC-10Co4Cr,the content of hard WC phase and the hardness of the composite coatings increased,and the abrasive wear volume loss decreased significantly,indicating that the abrasive wear resistance increased.With increasing content of WC-10Co4Cr,the free corrosion potential decreased,and the free corrosion current density increased,indicating the corrosion resistance decreased.The composite coating with 60wt%WC-10Co4Cr had the best performance;its wear resistance was equivalent to that of electroplated hard chromium layer,its corrosion resistance was better than that of electroplated hard chromium layer,and its hardness was slightly lower than that of electroplated hard chromium layer.It was feasible to replace electroplated hard chromium layer with this coating with 60wt%WC-10Co4Cr.
作者
劳新力
张家健
高传连
曹利锋
王群
LAO Xinli;ZHANG Jiajian;GAO Chuanlian;CAO Lifeng;WANG Qun(Zhanjiang Branch,China National Offshore Oil Corporation China Limited,Zhanjiang 524000,China;Zhuzhou AECC PST Nanfang Gas Turbine Co.,Ltd.,Zhuzhou 412008,China;College of Materials Science and Engineering,Hunan University,Changsha 410082,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2024年第5期84-89,共6页
Materials For Mechanical Engineering
基金
湖南省自然科学基金面上资助项目(2023JJ30153)。
关键词
超音速火焰喷涂
金属陶瓷涂层
磨粒磨损
耐腐蚀性能
high velocity air fuel spraying
cermet coating
abrasive wear
corrosion resistance
