WC-NiCrBSi复合涂层的制备与耐磨性能研究

Preparation and wear resistance of WC-NiCrBSi composite coating

将镍包WC粉末与NiCrBSi粉末、粘结剂按一定比例混合后压制成WC涂层布I,用同样的方法制备了NiCrBSi钎料涂层布Π.采用真空熔覆法制备了WC-NiCrBSi复合涂层,通过改变WC-NiCrBSi涂层成分,研究涂层孔隙、耐磨性的变化规律.结果表明:随着WC质量分数的增加,孔隙增加,越靠近基体处孔隙越多.磨损量随着WC含量的增加先减少后增加. WC质量分数为30%、40%、50%、60%、70%、80%的复合涂层的磨损量分别为11. 2,10. 6,10. 1,10. 2,10. 5,10. 7 mg.磨损机制主要为脱层磨损、磨粒磨损和疲劳磨损.

Nickel coated WC powder,NiCrBSi solder powder and binder were mixed according to a certain proportion and then pressed into coating Ι.The same method was used to fabricate NiCrBSi solder coating Ⅱ.WC-NiCrBSi composite coating was prepared by vacuum cladding method.By changing the composition of WC-NiCrBSi coating,the change-law of the porosity and wear resistance of the coating were studied.The result showed that with the increase of WC mass fraction,the porosity increased.More holes were located at the junction of the coating and the substrate.The amount of wear decreased first and then increased with the increase of WC content.The wearing capacity of composite coatings with WC mass fraction of 30%,40%,50%,60%,70% and 80% were 11.2,10.1,10.2,10.5,10.7mg,respectively.The main wear mechanisms were delamination wear,abrasive wear and fatigue wear.