铝合金表面Ni基复合涂层制备机理及摩擦性能  

Preparation mechanism and tribological performance of Ni-base composite coating on aluminum alloy surface

作　　者：闫成旗 贾竹英 李占君[1] YAN Cheng-qi;JIA Zhu-ying;LI Zhan-jun(School of Mechanical Engineering,Anyang Institute of Technology,Anyang 455000,China;Engineering training center,Anyang Institute of Technology,Anyang 455000,China)

机构地区：[1]安阳工学院机械工程学院,河南安阳455000 [2]安阳工学院工程训练中心,河南安阳455000

出　　处：《兰州理工大学学报》2023年第3期15-22,共8页Journal of Lanzhou University of Technology

基　　金：河南省自然科学基金(232300420325);河南省高等学校重点科研项目(22A430011)。

摘　　要：为提高铝合金在航空航天应用中的表面抗磨性能,采用机械球磨方法在其表面制备了Ni-Al和3种不同W含量的Ni-Al-W复合涂层.研究表明:四种复合涂层组织均匀分布,厚度约为50~100μm.随着W含量的增加颗粒的韧性变形面逐渐减少.经过热处理后,Ni-Al复合涂层中有Al 3 Ni和Al_(3)Ni_(2)金属间化合物生成,但其剩余粉末中仅有Al_(3)Ni_(2)生成,并且无细粉剩余.3种Ni-Al-W复合涂层和粗粉中有AlNi和Al_(3)Ni_(2)生成,细粉中Al_(3)Ni_(2)金属间化合物随W含量的增加逐渐消失.复合涂层显微硬度随W含量的增加有所增加,含W涂层摩擦系数略高于铝合金基体和Ni-Al复合涂层,处于0.6~0.75,但其磨损率远低于基体铝合金和Ni-Al复合涂层,约为0.2×10^(-3)~0.4×10^(-3)mm 3/(N·m),并且随W含量的增加略有降低.铝合金表面Ni-Al-W复合涂层的制备有效提升了铝合金表面的抗磨性能.To improve the surface wear resistance of aluminum alloy in the application,Ni-Al and three different Ni-Al-W composite coatings were prepared on the surface of aluminum alloy by mechanical milling method.The study showed that the inner tissues of the four composite coatings are evenly distributed with a thickness of about 50μm to 100μm.With the increase of W content,the ductile deformation surface of the particle gradually decreases.After heat treatment,Al 3 Ni and Al_(3)Ni_(2) intermetallic compounds are generated in the Ni-Al compound coating,but only Al_(3)Ni_(2) is produced in the remaining powder,and no fine powder remain.AlNi and Al_(3)Ni_(2) are generated in the three Ni-Al-W composite coatings and coarse powder,and the Al_(3)Ni_(2) intermetallic compounds in the fine powder gradually disappear with increasing W content.The microhardness of the composite coating increase with increasing W content,the friction coefficient of the three coatings is slightly higher than that of the aluminum alloy matrix and Ni-Al composite coating,between 0.6 and 0.75,however,its wear rate is much lower than that of matrix aluminum alloy and Ni-Al composite coating,about 0.2×10^(-3)~0.4×10^(-3)mm 3/(N·m),and slightly reduce with the increase of W content.The preparation of Ni-Al-W composite coating on aluminum alloy surface effectively improves the wear resistance of aluminum alloy surface.

关 键 词：铝合金 复合粉末 机械球磨 金属间化合物 抗磨性能 

分 类 号：TG495[金属学及工艺—焊接]