南京航空航天大学学报2012，Vol.44Issue(2)：222-227,6.
柔性电极电火花强化钛合金表面性能
Surface Property of Titanium Alloys by Electrospark Surface Strengthening of Flexible Electrode
摘要
Abstract
Electrospark surface strengthening of titanium alloys is done by flexible rotating copper electrode with high-frequency pulse power supply. Then the oxygen and other elements from the air could react with titanium under the condition of high temperature and pressure caused by discharge. Experimental results show that the surface hardness of titanium alloy is improved by 237%-399% with reference to the substrate, and the thickness of the strengthened layer reaches a range of 21～157μm. Through energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) analysis, it is shown that titanium oxides and other strengthening matter such as titanium and copper/zinc alloys are generated on the titanium surface. In addition, obvious mechanical scraping and coating traces exist on the strengthening surface, but there are no significant traditional discharge erosion concave pits. At the same time, single pulse discharge energy is dispersed, thus the surface roughness value increases a little and is controllable. Besides, the strengthened layer has an improved ability of anti-corrosion in the mixed solution of hydrofluoric acid and nitric acid, and the enhanced layer has a high corrosion resistance. Point and surface wear tests show that the surface abrasion performance of the strengthened layer is improved significantly relative to the substrate surface. Good abrasion resistance, good corrosion resistance, and good quality of titanium alloy surface are obtained after being hardened.关键词
钛合金/柔性电极/电火花加工/表面强化Key words
titanium alloys/ flexible electrode/ electric discharge machining/ surface strengthening分类
矿业与冶金引用本文复制引用
刘志东,徐安阳,王振兴,张艳..柔性电极电火花强化钛合金表面性能[J].南京航空航天大学学报,2012,44(2):222-227,6.基金项目
国家自然科学基金(51175256)资助项目 （51175256）
航空科学基金(20100343004,2011ZE52060)资助项目 （20100343004,2011ZE52060）
江苏省自然科学基金(BK201122973)资助项目. （BK201122973）
