SiC增强Ti-6Al-4V合金微弧氧化陶瓷层的摩擦磨损性能

Tribological Behaviors of Ceramic Coatings Fabricated by Micro-arc Oxidation with Addition of SiC Micro-particles for Ti-6Al-4V Alloys

采用微弧氧化方法,通过在电解液中掺杂不同粒径碳化硅颗粒,在Ti-6Al-4V合金表面制备含不同粒径碳化硅的陶瓷膜层。利用扫描电子显微镜、X射线衍射仪和摩擦磨损实验机研究了膜层的微观形貌、结构物相以及摩擦磨损性能。实验结果表明,碳化硅对钛合金微弧氧化膜层表面形貌以及摩擦磨损性能影响显著,较小粒径碳化硅颗粒引入微弧氧化膜层可以显著降低微弧氧化膜层孔隙率,增强膜层表面致密度,较大提高膜层减摩耐磨性能。其中1~2μm粒径的碳化硅对膜层耐磨性的提高效果最为显著。较大粒径碳化硅难以通过尺度较小的微弧氧化孔进入微弧氧化层,减摩耐磨性能提高较小。

By adding SiC micro-particles with different sizes to the electrolyte, micro-arc oxidation（MAO） technique was employed to fabricate oxide ceramic layer of Ti-6Al-4V alloys reinforced by SiC micro-particles. Scanning electron microscope, X-ray diffractometer and ball-on-disk sliding tester were used to analyze surface topography, phase composition and tribological properties of the prepared samples, respectively. The results show that SiC micro-particles have significant effects on the surface topography and tribological properties of the reinforced layer. SiC particles with smaller sizes would reduce the porosity and improve the density and tribological property of Ti-6Al-4V alloys dramatically, especially for SiC particles with the diameter of 1-2 μm. By contrast, larger SiC particle cannot go through the pores in the oxide layer for its larger size, so that the wear resistance property of the oxidation layer is improved slightly.