CrN涂层制备中氮气比例对耐磨抗黏附性能的影响

Effect of Nitrogen Ratio on Wear Resistance and Anti⁃Stick Properties in the Preparation of CrN Coating

采用多弧离子镀技术在38CrMoAl样片表面制备CrN涂层,利用扫描电子显微镜、纳米压痕仪、摩擦磨损试验机、X射线衍射仪及接触角测量仪,研究了氮气比例对CrN涂层耐磨抗黏性能的影响。结果表明,随着氮气比例的增加,CrN涂层由Cr、Cr_(2)N和CrN的混合相向CrN单相转变;CrN涂层磨损率远低于基体磨损率,CrN⁃65涂层的磨损率最低仅为1.01×10^(-6)mm^(3)/(N·m),低于基体磨损率一个数量级。所有CrN涂层表面均表现出疏水性;聚碳酸酯(PC)熔体高温接触角试验中,CrN⁃15涂层与PC熔体的高温接触角最高为110.8°,高于基体的102.2°;经过低温退火处理后,所有表面与PC熔体的高温接触角均降低,但是CrN⁃15涂层退火后仍能保持最高的高温接触角(102.9°),明显高于退火后基体的高温接触角(85.3°),表现出最佳的抗黏附性能。CrN⁃15涂层表现出较好的耐磨性和抗黏附性,综合性能较好,为CrN涂层在塑料加工螺杆和注塑模具表面应用提供一定的技术支撑。

Preparation of CrN coatings on the surface of 38CrMoAl samples by multi⁃arc ion plating.The effect of nitrogen ratio on the wear resistance and anti⁃adhesion performance of CrN coatings was investigated with the aid of scanning electron microscope,nanoindenter,friction and wear testing machine,X⁃ray diffraction instrument and contact angle measuring instrument.The results showed that as the nitrogen ratio increases,the CrN coating changes from a mixed phase of Cr,Cr_(2)N and CrN to a single phase of CrN.Wear tests showed that the wear rate of the CrN coating was much lower than that of the substrate,with the lowest wear rate of the CrN⁃65 coating being only 1.01×10^(-6)mm^(3)/(N·m),an order of magnitude lower than that of the substrate.In the PC melt high temperature contact angle test,the highest contact angle between the CrN⁃15 coating and the PC melt was 110.8°,higher than the 102.2°of the substrate;after low temperature annealing,the high temperature contact angle between all surfaces and the PC melt decreased,but the CrN⁃15 coating still maintained the highest contact angle of 102.9°after annealing,which was significantly higher than that of the substrate at 85.3°,showed the best anti⁃adhesion properties.The CrN⁃15 coating exhibits good wear resistance and anti⁃adhesion properties and had excellent overall performance,providing some technical support for the application of CrN coatings on the surfaces of plastic processing screws and injection moulds.