纯钛表面辉光放电W-Mo共渗层的耐磨及耐蚀性能(英文)

Wear resistance and corrosion resistance of W-Mo Co-penetrated layer on pure titanium by glow discharge

采用等电位空心阴极辉光放电技术对纯钛进行W-Mo二元共渗,通过扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度计对试样的结构形貌、渗层成分分布及相组成、硬度进行研究。利用摩擦磨损试验仪对试样的摩擦学性能进行研究,利用电化学腐蚀工作站,研究了W-Mo合金渗层在常温静态条件下,在3.5%Na Cl腐蚀介质中的耐蚀性能。结果表明,经W-Mo共渗处理后纯钛表面形成了一层均匀致密的W-Mo改性层,渗层最大厚度达到16.6μm,最大硬度达到1196HV0.1,是基体的6.85倍。W-Mo共渗后改性层主要由W、Mo、Mo Ti、TixW1-x相组成。由于表面硬度的大幅提升,试样表面的耐磨性也显著提高,最低摩擦系数仅为0.23,较原始试样的0.516明显减小。测得的试样最低腐蚀速率为0.0016 mm/a,是原始试样的1/230,耐蚀性能也显著提高。

The W-Mo Co-penetrated layer was prepared on pure titanium surface by the technology of equipotential hollow cathode glow discharge. The morphology,distribution of composition,phase composition and hardness of the layers were analyzed by means of scanning electron microscope( SEM),energy dispersive spectrometer( EDS),X-ray diffraction( XRD) and microhardnss tests,respectively. The tribology capability of the layer was studied by the friction and wear tests,the corrosion resistance of the W-Mo Co-penetrated layer in3. 5% Na Cl solution was studied under the normal temperature static condition by using the electrochemical workstation. The results show that the tight W-Mo Co-penetrated layer is formed on the pure titanium surface by the treatment of glow discharge,and the maximum thickness of the modified layer is 16. 6 μm,and the maximum hardness is 1196 HV0. 1,which is 6. 85 times that of the matrix. The phase composition of the W-Mo Co-penetrated layer is W,Mo,Mo Ti,TixW1- x. Due to the improved surface hardness,the wear resistance on the surface of the sample is increased significantly,and the minimum friction coefficient is only 0. 23,which is obviously decreased than that of the original sample( 0. 516). The minimum annual corrosion rate of the samples is 0. 0016 mm / a,which is 1 /230 that of the original sample,so the corrosion resistance is obviously improved.