TiAl合金表面NiCrAlY涂层的抗高温氧化性能  

High Temperature Oxidation Resistance of NiCrAlY Coating on Surface of TiAl Alloy

作　　者：周鹏[1] 张平则[1] 魏东博[1] 魏祥飞[1] 张扬[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《机械工程材料》2014年第2期63-67,71,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51175247);江苏省研究生创新基金项目(CXZZZ11-0203);南京航空航天大学研究生创新基地(实验室)开放基金资助项目(kfjj120123)

摘　　要：采用多弧离子镀技术在γ-TiAl合金表面制备了NiCrAlY涂层，用SEM、EDS和XRD等分析了涂层在高温氧化前后的形貌、结构和物相组成，用恒温氧化方法测试了涂层与基体的氧化动力学曲线。结果表明：涂层在高温下可形成保护性氧化膜，使其抗氧化性能显著提升；在650～950℃氧化时，镍和钛元素发生互扩散，850℃时，涂层与基体之间形成了扩散带和齿状TiNi相，950℃时，互扩散现象加剧，涂层表面生成了TiO2，涂层氯化膜与基体间形成了Kirkendall孔洞，对其抗高温氧化性能不利。A NiCrA1Y coating was deposited on the surface of γ-TiAl alloy by multi-arc ion plating （MAIP）. The morphology, microstructure and phase composition of the coating were investigated by scanning electron microscopy （SEM）, energy dispersive spectrometer （EDS） and X-ray diffraction （XRD）. The oxidation kinetic curves of the substrate and coating were obtained by oxidation at constant temperature. Results indicate that a layer of protective oxide film forming on the coating at high temperature could significantly improve the oxidation resistance of TiA1 alloy. Mutual diffusion of Ni, T[ elements happened at 650--950 ℃. A diffusion zone and dentate TiNi phase between the coating and the substrate were found at 850 ℃, then at 950 ℃ the phenomenon of mutual diffusion aggravated, TiO2 generated on the coating surface, which resulted in Kirkendall pores at the interface between the coating oxide film and the substrate. This was not benifical to improve the high temperature oxidation resistance.

关 键 词：Γ-TIAL合金 多弧离子镀技术 NICRALY涂层 高温氧化 

分 类 号：TG174.445[金属学及工艺—金属表面处理]