Effect of Ta Interlayer on Interdiffusion Behavior of NiCrAlY Coated γ-TiAl
γ-TiAl based alloys are promising candidates for structural materials. However their poor oxidation resistance at temperatures higher than 800℃ restrains their practical use. NiCrAlY can remarkably improve the oxidation resistance of TiAl though serious inward diffusion of Ni from the NiCrAlY coating to the substrate affects the useful life of NiCrAlY. In this paper a Ta interlayer was deposited employing magnetron sputtering between NiCrAlY coating and Y-TiAl substrate as a diffusion barrier. The effect of the diffusion barrier on the interdiffusion of the alloying elements of the γ-TiAl/Ta/NiCrAlY system was investigated at 1000℃ for various time. The phase constitution of the diffusion layers in the interdiffusion zone was identified by XRD and EDS. It seems that the Ta interlayer cannot retard the inward diffusion of Ni effectively.
γ-TiAl NiCrAlY overlay coating magnetron sputtering arc ion plating ozidation
CHENG Yu-xian WANG Wen ZHU Sheng-long WANG Fu-hui
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
国际会议
沈阳
英文
18-21
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）