发动机活塞用ZL109铝合金表面等离子喷涂镍基合金涂层的耐磨性能  

Wear Resistance of Plasma Sprayed Ni-Based Alloy Coating on ZL109 Aluminum Alloy Surface for Engine Piston

作　　者：杜伟 韩冰源[1] 崔方方[1] 杭卫星[1] 丛孟启 徐文文 楚佳杰 高祥涵 吴海东 DU Wei;HAN Bingyuan;CUI Fangfang;HANG Weixing;CONG Mengqi;XU Wenwen;CHU Jiajie;GAO Xianghan;WU Haidong(School of Automotive and Traffic Engineering,Jiangsu University of Technology,Changzhou 21300l,China)

机构地区：[1]江苏理工学院汽车与交通工程学院,常州213001

出　　处：《机械工程材料》2022年第11期26-32,共7页Materials For Mechanical Engineering

基　　金：江苏省自然科学基金资助项目(BK20191036);国防基础科研计划项目(JCKY 61420051911)。

摘　　要：采用等离子喷涂技术在发动机活塞用ZL109铝合金表面制备Ni60CuMo合金涂层,研究了涂层的微观形貌、物相组成、显微硬度以及不同条件下的耐磨性能。结果表明:涂层由富铬区和富镍区交替重叠构成,与基体间的结合方式为机械结合;涂层的孔隙率为2.48%,平均显微硬度为792.91 HV,约为基体的6倍以上;随试验温度由25℃升高至450℃,涂层的摩擦因数和磨损质量损失均降低,450℃油润滑下涂层的平均摩擦因数为0.037,磨损质量损失为7.35 mg,仅为基体的1/4左右;随试验温度的升高,干摩擦下涂层的磨损机制由剥落失效转变为氧化磨损与黏着磨损,油润滑下由磨粒磨损转变为磨粒磨损和黏着磨损,最后转变为黏着磨损。A Ni60 CuMo alloy coating was prepared by plasma spraying on the surface of ZL109 aluminum alloy for engine piston.The microstructure,phase composition,microhardness and wear resistance under different conditions of the coating were studied.The results show that the coating was composed of alternately overlapping Cr-rich zone and Ni-rich zone,and the bonding mode between coating and substrate was mechanical bonding.The porosity of the coating was 2.48%.The average microhardness was 792.91 HV and was about more than 6 times that of the substrate.The friction coefficient and wear mass loss decreased with increasing test temperature from 25℃to 450℃.Under 450℃oil lubrication condition,the average friction coefficient of the coating was 0.037,and the wear mass loss was 7.35 mg,which was only about 1/4 of the substrate.With increasing test temperature,the wear mechanism of the coating changed from peeling failure to oxidation wear and adhesive wear under dry friction condition,and from abrasive wear to abrasive wear and adhesive wear under oil lubrication condition,and finally to adhesive wear.

关 键 词：铝合金 等离子喷涂 镍基合金涂层 显微硬度 耐磨性能 磨损机制 

分 类 号：TG174.442[金属学及工艺—金属表面处理]