钛合金表面阳极微弧等离子体渗硼层的研究

采用阳极微弧等离子体技术研究了钛合金表面渗硼层的微观组织和性能。通过光学显微镜、扫描电镜(SEM)、X射线衍射仪(XRD)、能谱仪(EDS)表征分析了渗硼层的表面和截面的微观组织、形貌、相结构、渗层元素分布。借助摩擦磨损试验机测试了渗硼层的耐磨性,运用电化学工作站对渗硼后的TC4材料进行了耐腐蚀性测试。结果表明,钛合金表面阳极微弧等离子体渗硼技术制备的渗硼层连续致密。渗硼层主要由金属间化合物TiB2和TiB组成,其与氧化层共同作用,能显著提高钛合金表面的耐磨性。渗硼后的TC4钛合金耐腐蚀性较基体有所降低。表面阳极微弧等离子体技术是一种新型的钛合金表面改性方法。

The Anode Micro-arc Plasma Boriding Layer on Titanium Alloy

An anode micro-arc plasma boriding technique was performed on titanium alloy to investigate the microstructure and properties of boriding layer. The morphology and microstructure of the surface and section of boriding layer, phase composition and elements distribution were examined using optical microscopy (SEM), scanning electron microscopy, X-ray diffractometer (XRD) and the energy dispersion spectrum (EDS). And the wear resistance of layer was assessed by conducting pin-on-disk wear tests and friction coefficient tests. Furthermore, the corrosion resistance was investigated by measuring polarization curves. The results showed that the boriding layer prepared by the anodic micro-arc plasma boriding on the titanium alloy was continuous and compact. Moreover, the boriding layer was mainly composed of intermetallic compounds TiB₂ and TiB combined with the oxide layer, which could significantly improve its surface wear resistance. But the corrosion resistance of boriding layer was lower than that of the substrate. Anode micro-arc plasma technology is a kind of novel method of titanium alloy surface modification.