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si-al-y co-deposition coatings Prepared on Ti-al alloy for Enhanced High Temperature Oxidation Resistance

Journal of Wuhan University of Technology(Materials Science) 2018年第4期33卷 959-966页

作者：李涌泉 XIE Faqin LI Xuan School of Materials Science & Engineering North Minzu University School of Aeronautics Northwestern Polytechnical University college of Mechanical Engineering Sichuan University of Science and Engineering

si-al-y co-deposition coatings were prepared on Ti-al alloy by pack cementation processes at 1 050 ℃ for 4 h with different halide activators in the packs for enhancing the high temperature oxidation resistance of Ti-al alloy. The structure, constituent phases, formation process and oxidation behavior of the coatings were investigated. The experimental results showed that the coatings prepared respectively with NaF and NH_4Cl as activators were composed of a（Ti, X）_5si_4,（Ti, X）_5si_3（X represents Nb and Cr）, and Tisi_2 outer layer, a Tial_2 inner layer and an al-rich interdiffusion zone. However, the constituent phases changed into Tisi_2 in the outer layer and（Ti, X）_5si_4 and（Ti, X）_5si_3 phases were observed in the middle layer of the coating prepared with alCl_3·6H_2O activator. Among the halide activators studied, the coating prepared with alCl_3·6H_2O was thicker and denser, which is the only suitable activator for pack si-al-y co-deposition coatings on a Ti-al alloy. The oxidation results show that the coating can protect the Ti-al alloy from oxidation at 1000 ℃ in air for at least 80 h. The excellent oxidation resistance of the coating is attributed to the formation of a dense scale mainly consisted of TiO_2, siO_2 and al_2O_3.

关键词： Ti-al alloy si-al-y co-deposition coating oxidation resistance equilibrium partialpressure

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