分散方式对Ni-Si_3N_4纳米复合电镀层显微组织和性能的影响

Influence of dispersion mode on microstructure and properties of Ni-Si_3N_4 nano-composite coatings

采用超声波分散加机械搅拌技术在纯铜板上制备了含有纳米Si3N4颗粒的镍基纳米复合镀层,研究了分散方式对复合镀层中纳米颗粒含量、复合镀层组织结构、显微硬度和磨损性能的影响。利用扫描电镜(SEM)和X-射线衍射仪(XRD)分析了镀层表面的显微组织及相结构,通过磨损实验机检测了复合镀层的耐磨性能。结果表明,采用超声波分散技术可获得组织细密、高显微硬度的纳米复合镀层,其显微硬度最高可达996 HV,耐磨性能较未经超声波分散处理的镀层有显著提高。

Ni-based nano-com matrix by using ultrasonic posite coatings with nano-Si3N4 particles were prepared on pure copper dispersion technique plus magnetic stirrer technique. The effects of ultrasonic dispersion on the contents of nano-Si3N4 particles, microstructure of the composite coatings were studied. The microstructure and phase compositions of the composite coatings were analyzed by SEM and XRD. The microhardness and wear resistance were measured. It was demonstrated that the composite coatings obtained by using ultrasonic dispersion plus magnetic stirrer technique have finer microstructure and a highest microhardness up to 996 HV and the wear resistance has a significant increase as compared with the coatings without using ultrasonic dispersion technique.