利用真空脉冲碳氮复合渗技术在TC4钛合金表面制备了梯度强化层.采用XRD和SEM对复合渗层组织结构进行了表征,并对其硬度分布、耐磨性和耐蚀性进行了分析.结果表明,经过真空脉冲碳氮复合渗处理后的TC4钛合金表层由TiC、TiN和C07N03Ti相组成.其中先渗碳后渗氮工艺所获得的合金渗层最厚,其磨损率达到5.370×10-8cm3·min-1·N-1,只有原样的1/36,腐蚀速率从原样的13.5 mm/a减小到0.421 mm/a,综合性能最优.
The strengthening gradient layer was prepared on TC4 titanium alloy surface by vacuum pulse carburizing and nitriding compound infiltration technology.Phase and microstructure of the C-N compound layer were investigated by means of XRD and SEM.The hardness gradient,wear resistance and corrosion resistance of the layer were also studied.The results show that the C-N compound layer is composed of TiC,TiN and C0.7N0.3Ti phases.The maxium thickness of the C-N compound layer prepared by firstly carburizing and then nitriding is obtained,and its wear rate is 5.370 × 10-8 cm3·min-1 · N-1,only 1/36 that of the TC4 titanium alloy matrix,the corrosion rate reduces from 13.5 mm/a of the TC4 titanium alloy matrix to 0.421 mm/a for the alloy with C-N compound layer.
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