2Cr13钢PVC挤出模冷喷涂修复涂层的性能  

Properties of cold spray repaired coating on 2Cr13 steel extrusion mold for PVC plastic

作　　者：冯仲达 阿达依·谢尔亚孜旦[1] Feng Zhongda;Adayi Xieeryazidan(College of Mechanical Engineering,Xinjiang University,Urumqi Xinjiang 830000,China)

机构地区：[1]新疆大学机械工程学院,新疆乌鲁木齐830000

出　　处：《金属热处理》2023年第1期238-245,共8页Heat Treatment of Metals

基　　金：国家自然科学基金(51665056)。

摘　　要：为修复PVC挤出机失效模具,采用低压冷喷涂技术在2Cr13钢表面制备Cu-Al_(2)O_(3)涂层。通过模拟涂层粒子的成形过程,发现越靠近基体的涂层内能越高,结合效果越好。同时为保证修复模具的耐磨、耐蚀性能,对涂层进行打磨抛光,对比不同厚度涂层的性能。用扫描电镜(SEM)观察涂层形貌,用浸泡法与盐雾腐蚀试验分析涂层的耐蚀性能,用静态压痕法测试涂层硬度,用摩擦磨损试验机测试涂层耐磨性能。结果显示:涂层质地均匀,孔隙率随着与结合面距离的提升而增大;涂层的耐HCl腐蚀性优于基体2Cr13钢,盐雾试验中涂层发生明显腐蚀,有AlCl_(3)与CuO产物生成;涂层位置越靠近结合处,其硬度越高、加工硬化效应越明显,与硬质合金摩擦时的磨损量越小,耐磨性逐步提高。当打磨后的涂层厚度为1 mm时,涂层的耐磨性最好,可以有效修复挤出机模具。To repair a failed PVC plastic extruder mold,Cu-Al_(2)O_(3)coating was prepared on the surface of the 2Cr13 steel by low-pressure cold spray technology.By simulating the forming process of coating particles,it is found that the higher the inner energy of the coating closer to the substrate,the better the binding effect.In order to ensure the wear and corrosion resistance of the repaired mold,the coating were ground and polished to different thickness,and then the properties were compared.Scanning electron microscopy was used to observe morphology of the coating,immersion mass loss method and salt spray corrosion test were used to analyze the corrosion resistance of coatings,static indentation method was used to test the hardness of the coating,friction and wear testing machine was used to test the wear resistance of the coatings.The results show that the coating has a uniform structure,the porosity of the coating increases with the increase of the distance from the jointing surface,the corrosion resistance of the coating in HCl is better than that of the substrate,however in the salt spray test,the coating is obviously corroded,and AlCl3and CuO products are formed.The closer the coating position is to the joining surface,the higher the hardness of the coating,the more obvious the work hardening effect,the smaller the wear amount when rubbing with hard alloy,and the wear resistance is gradually improved.When the thickness of the polished coating is 1 mm,the wear resistance of the coating is the best,and the extruder mold can be effectively repaired.

关 键 词：冷喷涂 仿真分析 耐蚀性 微观形貌 摩擦性能 

分 类 号：TG156.84[金属学及工艺—热处理]