钛合金双极微弧氧化膜层抗高温氧化性能

Research on Preparation and Properties of Micro-arc Bipolar Oxide Coating of Titanium Alloy

利用双极放电微弧氧化法,在硅酸盐体系中制备了以TiO_(2)为主晶相的陶瓷膜层。采用XRD、SEM等表征手段,分析了膜层表面的相组成及表面形貌,研究了双电极放电模式对膜层抗高温性能的影响。结果表明:微弧氧化膜层的主晶相为锐钛矿相和金红石相TiO_(2),随着占空比的升高,金红石相TiO_(2)的衍射峰增强,其含量增多,陶瓷膜表面微孔变多。抗高温氧化增重实验显示,双电极放电制备的微弧氧化陶瓷膜层抗高温能力明显提高。

Ceramic coating was prepared on the surface of titanium alloy TC4 by bipolar discharge micro-arc oxidation in silicate system.XRD and SEM were used to analyze the phase composition and surface morphology of the coating.The influence of bipolar discharge mode on the high temperature resistance of the film was discussed.The results showed that the main crystal phase of the generated micro-arc oxidation coating was anatase phase and rutile phase TiO_(2).With the increase of duty ratio,the diffraction peak of rutile phase TiO_(2)increased,the surface micropores of the ceramic coating became more while the coating became rough.The high temperature oxidation resistance test results showed that the high temperature resistance of micro-arc oxide ceramics prepared by double electrode discharge was improved remarkably.