Long-term oxidation behavior of silicon-aluminizing coating with an in-situ formed Ti5Si3 diffusion barrier on γ-TiAl alloy

被引：37

作者：

Huang, Jiang ^{[1
,2
]}

Zhao, Feng ^{[1
,2
]}

Cui, Xinyu ^{[1
]}

Wang, Jiqiang ^{[1
]}

Xiong, Tianying ^{[1
]}

机构：

[1] Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China

[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2022年 / 582卷

基金：

中国国家自然科学基金;

关键词：

High-temperature oxidation; Silicon-aluminizing diffusion coating; In-situ diffusion barrier; gamma-TiAl; Cold spray; Ti (5) Si (3); HIGH-TEMPERATURE OXIDATION; AL; RESISTANCE; MECHANISMS; FILM;

D O I：

10.1016/j.apsusc.2022.152444

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In the present study, a novel silicon-aluminizing diffusion coating composed of uniform Ti (Al, Si)(3) phase was manufactured on gamma-TiAl alloy via post heat-treatment of cold-sprayed Al-40Si (wt.%) coating. The high temperature oxidation resistance of the diffusion coating was evaluated under 950 C for 1000 h. During the oxidation process, Ti5Si3 precipitations with network-like structure were shaped in the inner of the diffusion coating, which acted as getters for Ti and promoted the formation of Al2O3 scale. Meanwhile, an in-situ Ti5Si3 diffusion barrier was also formed, which inhibited the interdiffusion between the coating and substrate, especially the fast depletion of Al in the diffusion coating and thus improved the long-term oxidation resistance of gamma-TiAl. The microstructure evolution, formation of the in-situ diffusion barrier and high temperature oxidation resistance mechanisms of the diffusion coating were discussed in detail.

引用

页数：13