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离子源增强电弧离子镀活塞环表面CrN涂层的制备

发布时间:2019-06-28 15:11
【摘要】:为了寻求发动机核心部件活塞环上电镀硬铬的替代技术,采用自行设计的离子源增强阴极电弧离子镀系统,在W18Cr4V高速钢试块上制备了不同厚度的CrN涂层,用XRD、SEM分析涂层的晶体结构、表面形貌和厚度;利用显微硬度计和球盘式摩擦仪分析了涂层厚度对力学性能的影响。结果表明:随着厚度的增加,CrN涂层结晶结构没有明显变化,2.5μm厚CrN涂层硬度达1 900 HV0.05,最低摩擦因数0.6,最低磨损速率2.664×10~(-6) mm~3/N·m。对CrN涂层和电镀硬铬ASL817钢质活塞环进行珩磨测试,在珩磨2 400次之后,CrN涂层钢质活塞环出现较大孔洞(50μm),但没有涂层脱落,具有良好的附着力,工作间隙变化不大;电镀硬铬活塞环涂层磨损较CrN涂层严重,工作间隙开始变大;珩磨12 000次后电镀硬铬活塞环工作间隙达到允许最大值,CrN涂层活塞环依保持正常工作间隙,耐磨性更好。
[Abstract]:In order to obtain the replacement technology of electroplating hard chromium on the piston ring of the core component of the engine, a self-designed ion source enhanced cathode arc ion plating system was used to prepare the CrN coating with different thickness on the W18Cr4V high-speed steel block, and the crystal structure, the surface morphology and the thickness of the coating were analyzed by XRD and SEM. The effect of the coating thickness on the mechanical properties was analyzed by means of the micro-hardness tester and the ball-disc type friction instrument. The results show that with the increase of the thickness, the crystal structure of the CrN coating is not changed obviously, the hardness of the 2.5. m-thick CrN coating is up to 1 900 HV0.05, the minimum friction factor is 0.6, the minimum wear rate is 2.664-10-(-6) mm-3/ N 路 m. The CrN coating and the electroplated hard-chrome ASL817 steel piston ring are subjected to the abrasion-grinding test, After 2,400 times, the steel piston ring of the CrN coating had a large hole (50. mu.m), but without the coating, the steel piston ring had good adhesive force and little change of working gap, and the coating of the hard chrome piston ring was more worn than the CrN coating, and the working gap became larger. When the working clearance of the hard chrome piston ring is reached to the maximum value after 12 000 times of grinding, the piston ring of the CrN coating can maintain the normal working gap, and the wear resistance is better.
【作者单位】: 岭南师范学院物理科学与技术学院;广州铁路职业技术学院机械与电子学院;武汉大学加速器实验室;
【基金】:国家自然科学基金(11405117) 广东省高等学校优秀青年教师培养项目(YQ2015208) 广州市高校创新创业教育项目(2017244210)~~
【分类号】:TG174.4

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