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利用针状等电位空心阴极放电技术,在低于钛合金Ti6Al4V相变温度下,对其表面进行W-Mo共渗。利用扫描电子显微镜、X射线衍射仪、显微硬度计、球-盘摩擦磨损试验仪等分析了改性层的表面及截面形貌、相组成、显微硬度;及在室温干摩擦条件下的耐磨性能;利用冲刷腐蚀试验机研究了W-Mo合金渗层在单相流和双相流冲刷腐蚀条件下,在Na Cl腐蚀介质中的耐蚀性能。结果表明:Ti6Al4V基体经过W-Mo共渗处理后,在其表面形成了厚度约为25.0μm的合金改性层。合金层由Al MoTi_2和Ti_xW_(1-x)相组成。改性层的显微硬度高达850 HV0.1,较基体(450 HV0.1)显著提高,改性层的平均摩擦系数也从基体的0.30降到0.14。W-Mo合金渗层良好的表面力学性能有效的保护了基体材料不受外力的冲刷,在单相流冲蚀下,W-Mo合金渗层的腐蚀速度只是基体Ti6Al4V的1/19;在双相流冲蚀条件下,只是基体Ti6Al4V的1/37。
The use of needle-like potential hollow cathode discharge technology, below the titanium alloy Ti6Al4V phase transition temperature, the surface W-Mo co-infiltration. The surface morphology, phase composition and microhardness of the modified layer were analyzed by scanning electron microscopy, X-ray diffraction, microhardness tester and ball-and-disk friction and wear tester. The corrosion resistance of W-Mo alloy infiltrated layer in Na Cl corrosive medium under single-phase flow and two-phase flow erosion was studied by means of erosion tester. The results show that the Ti6Al4V matrix has a thickness of about 25.0μm on the surface of the Ti6Al4V matrix. The alloy layer consists of Al MoTi_2 and Ti_xW_ (1-x) phases. The microhardness of the modified layer is as high as 850 HV0.1, which is significantly higher than that of the substrate (450 HV0.1). The average friction coefficient of the modified layer also decreases from 0.30 to 0.14 of the matrix. The surface mechanical properties of W-Mo alloy layer effectively protect the substrate from external force erosion. The corrosion rate of W-Mo alloy layer is only 1/19 of that of Ti6Al4V layer under single phase flow erosion. Phase flow erosion conditions, only the substrate Ti6Al4V 1/37.