High temperature oxidation behavior of Ti(Al,Si)3 diffusion coating on γ-TiAl by cold spray

被引：15
|
作者：
Wang, Ji-qiang [1 ]
Kong, Ling-yan [1 ]
Li, Tie-fan [1 ]
Xiong, Tian-ying [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2016年 / 26卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Ti(Al; Si)(3) diffusion coating; gamma-TiAl alloy; cold spray; heat-treatment; high temperature oxidation; PACK CEMENTATION PROCESS; TITANIUM ALUMINIDE ALLOYS; THERMAL BARRIER COATINGS; AL; RESISTANCE; SI; CODEPOSITION; IMPROVEMENT; SURFACE; PVD;
D O I：
10.1016/S1003-6326(16)64214-0
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
A Ti(Al,Si)(3) diffusion coating was prepared on gamma-TiAl alloy by cold sprayed Al-20Si alloy coating, followed by a heat-treatment. The isothermal and cyclic oxidation tests were conducted at 900 degrees C for 1000 h and 120 cycles to check the oxidation resistance of the coating. The microstructure and phase transformation of the coating before and after the oxidation were studied by SEM, XRD and EPMA. The results indicate that the diffusion coating shows good oxidation resistance. The mass gain of the diffusion coating is only a quarter of that of bare alloy. After oxidation, the diffusion coating is degraded into three layers: an inner TiAl2 layer, a two-phase intermediate layer composed of a Ti(Al,Si)(3) matrix and Si-rich precipitates, and a porous layer because of the inter-diffusion between the coating and substrate.
引用
收藏
页码：1155 / 1162
页数：8
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