【作者】 赵云； 张玉林； 陈飞；

【Author】 ZHAO Yun;ZHANG Yu-lin;CHEN Fei;College of Materials Science and Engineering,Beijing Institute of Petrochemical Technology;

【机构】 北京石油化工学院材料科学与工程学院；

【摘要】 利用针状等电位空心阴极放电技术,在低于钛合金Ti6A14V相变温度下,对其表面进行W-Mo共渗。利用扫描电子显微镜观察了改性层的表面及截面形貌;利用X射线衍射仪分析了改性层的相组成;利用显微硬度计测量了改性层的显微硬度;利用球-盘摩擦磨损试验仪测量了改性层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NaCl腐蚀介质中的耐蚀性能。结果表明:Ti6A14V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AlMoTi2和TixW1-x相组成。改性层的显微硬度高达850 HV0.1,而Ti6A14V基体的显微硬度为450 HV0.1,较基体显著提高。由于表面硬度的大幅提高,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机械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,W-Mo合金渗层的腐蚀速度只是基体Ti6Al4V的1/37。更多还原

【Abstract】 A needle-shape hollow cathode glow discharging process was developed for Ti6A14 V alloy,and the surface was treated by W-Mo penetration under the phase transition temperature.The surface and cross sectional morphology of the modified layer was analyzed by scanning electron microscopy;the phase structure of the modified layer was analyzed by X-ray diffraction;the microhardness of the modified layer was tested by the micro-sclerometer;the friction and wear behavior of the modified layer under dry sliding was evaluated on a ball-on-disc wear tester;the corrosion resistance in 3.5%NaCl solution was studied by the erosion corrosion tester under the single-phase flow and the double-phase flow corrosion-erosion.The results show that the W-Mo penetration layer that is about 25.0μm is formed on Ti6A14 V alloy after glow plasma discharging.The phases are mainly AlMoTi2 and TixW1-x in the modified layer.The microhardness of the modified layer is 850HV0.1,while the microhardness of the matrix is 450HV0.1.Due to the improved surface hardness,the friction coefficient of the modified layer is 0.14 down from 0.30.The good mechanical properties of W-Mo alloyed layer effectively protected the substrate material from external forces of erosion.In the single-phase flow erosion,the corrosion rate of the W-Mo alloyed layer was only 1/19 of the matrix Ti6A14 V,in the two-phase flow erosion,it was only 1/37.更多还原