Oxidation Behavior of TiAl(3)/Al Composite Coating on Orthorhombic-Ti(2)AlNb Based Alloy at Different Temperatures

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	Oxidation Behavior of TiAl(3)/Al Composite Coating on Orthorhombic-Ti(2)AlNb Based Alloy at Different Temperatures
	L. Y. Kong; B. Lu; X. Y. Cui; H. Du; T. F. Li; T. Y. Xiong
	2010
发表期刊	Journal of Thermal Spray Technology
ISSN	1059-9630
卷号	19 期号:3 页码:650-656
摘要	This paper reports the oxidation behavior of TiAl(3)/Al composite coating deposited by cold spray. The substrate alloy was orthorhombic-Ti-22Al-26Nb (at.%). The oxidation kinetics of the coating was tested at 650, 800, and 950 A degrees C, respectively. The parabolic rate constant for the coating oxidized at 650 A degrees C was k (p) = 7.2 x 10(-2) mg center dot cm(-2)center dot h(-1/2) for the tested 1200 h. For the coating oxidized at 800 A degrees C, the oxidation kinetics could be separated into two stages with k (p) value of 39.8 x 10(-2) mg center dot cm(-2)center dot h(-1/2) for the initial 910 h and 17.7 x 10(-2) mg center dot cm(-2)center dot h(-1/2) for the stage thereafter. For the coating oxidized at 950 A degrees C, the oxidation kinetics can be separated into three stages with k (p) of 136.9 x 10(-2) mg center dot cm(-2)center dot h(-1/2) in the first 100 h, followed by 26.9 x 10(-2) mg center dot cm(-2)center dot h(-1/2) from 100 to 310 h, and 11.8 x 10(-2) mg center dot cm(-2)center dot h(-1/2) from 310 to 1098 h. XRD, SEM, and EPMA were used to study the microstructure of the coating. The results indicated that the oxidation took place throughout the entire coating instead of only at the surface. The aluminum phase in the composite coating was soon oxidized to Al(2)O(3) in all tested cases. The aluminum in TiAl(3) phase was depleted gradually and oxidized to Al(2)O(3) along with the degradation of TiAl(3) to TiAl(2) and TiAl as the temperature increased and time proceeded. AlTi(2)N was also a typical oxidation product at temperature higher than 800 A degrees C. The experimental results also indicated that the protection of the coating was attributed greatly to the interlayer formed between the coating and the substrate.
部门归属	[kong, lingyan; lu, bin; cui, xinyu; du, hao; li, tiefan; xiong, tianying] chinese acad sci, state key lab corros & protect, inst met res, shenyang 110016, peoples r china.;kong, ly (reprint author), chinese acad sci, state key lab corros & protect, inst met res, shenyang 110016, peoples r china;lykong@imr.ac.cn tyxiong@imr.ac.cn
关键词	Cold Spray High-temperature Oxidation Orthorhombic Ti(2)Alnb Alloy Tial(3)/al Composite Coating Protection
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31185
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. Y. Kong,B. Lu,X. Y. Cui,et al. Oxidation Behavior of TiAl(3)/Al Composite Coating on Orthorhombic-Ti(2)AlNb Based Alloy at Different Temperatures[J]. Journal of Thermal Spray Technology,2010,19(3):650-656.
APA	L. Y. Kong,B. Lu,X. Y. Cui,H. Du,T. F. Li,&T. Y. Xiong.(2010).Oxidation Behavior of TiAl(3)/Al Composite Coating on Orthorhombic-Ti(2)AlNb Based Alloy at Different Temperatures.Journal of Thermal Spray Technology,19(3),650-656.
MLA	L. Y. Kong,et al."Oxidation Behavior of TiAl(3)/Al Composite Coating on Orthorhombic-Ti(2)AlNb Based Alloy at Different Temperatures".Journal of Thermal Spray Technology 19.3(2010):650-656.