【摘 要】
：
NiAl have been utilized as protective coatings or the bond coats in thermal barrier coatings (TBCs).Interdiffusion between the coatings and underlying superalloy substrates usually results in the form
【机 构】
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Beijing University of Aeronautics and Astronautics(BUAA),Department of Materials Science and Enginee
【出 处】
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第四届国际表面与界面科学与工程学术会议(The Fourth International Conference on S
论文部分内容阅读
NiAl have been utilized as protective coatings or the bond coats in thermal barrier coatings (TBCs).Interdiffusion between the coatings and underlying superalloy substrates usually results in the formation of topologically close-packed phase (TCP) and secondary reaction zone (SRZ),which significantly degrades the desired mechanical properties of superalloys.In this paper,a NiAl/RuNiAl coating was deposited onto the single crystal superailoy DD3 by electron beam physical vapor deposition (EB-PVD).Interdiffusion behavior and microstructure evolution of the coated superalloy were investigated.For the single NiAi coating,SRZ mainly comprising the need-like P phase and γ matrix,with a thickness of more than 30 μm,was formed beneath the primary interdiffusion zone (PIZ) after 100 h heat-treatment at 1100 ℃.In the NiAl/RuNiAl coating,Ru diffused outwards during heat-treatment.Very few TCP and SRZ were formed in the coating even after 100 h heat-treatment because the RuNiAl layer prevented Al from inward diffusion.
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