Effect of Ag on the oxidation of beta-NiAl at 1173 to 1373K in 10(5)Pa oxygen atmosphere

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	Effect of Ag on the oxidation of beta-NiAl at 1173 to 1373K in 10(5)Pa oxygen atmosphere
	X. J. Zhang; Z. G. Zhang; Y. Niu
	2005
发表期刊	High Temperature Materials and Processes
ISSN	0334-6455
卷号	24 期号:6 页码:359-368
摘要	Oxidation of two ternary NiAl-Ag alloys containing 0.5, 1 at.% Ag, denoted as NiAl-0.5Ag and NiAl-1Ag, and Ag-free beta-NiAl was studied at 1173, 1273, and 1373K for 24 h in 10(5)Pa O-2 to study the effect of the presence of silver on the oxidation behavior of beta-NiAl by TGA, XRD, and SEM/EDAX. The NiAl-Ag alloys contain a mixture of a silver-rich phase (a) and a matrix of nickel-aluminide NiAl (beta). Thus, these alloys are ternary two-phase systems containing two reactive elements plus a noble metal. Under the oxygen pressure used, nickel and aluminum can form stable oxides, while silver is noble. An exclusive and adhesive external Al2O3 scale formed on the beta-NiAl, NiAl-0.5Ag, and NiAl-1Ag alloys after 24h oxidation in 10(5)Pa O-2 at 1173 and 1273K. Some voids were observed at the interface of oxide and alloy containing silver and silver free NiAl at 1373K. The oxidation kinetics of the two alloys at 1173K and 1373K is similar to that of beta-NiAl. The initial oxidation rate of NiAl-0.5Ag and NiAl-1Ag at 1373K is similar to that of beta-NiAl. After 4h oxidation at 1373K the alloys containing silver begin to show mass loss. The addition of silver does not affect significantly the oxidation behavior of the NiAl intermetallic compound in all cases, as expected, because silver is essentially present only as a second phase due to its very small solubility in beta-NiAl.
部门归属	shenyang inst chem technol, shenyang 110142, peoples r china. chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china.;zhang, xj (reprint author), shenyang inst chem technol, shenyang 110142, peoples r china;zhangxuejun@syict.edu.cn
关键词	Beta-nial Ag Addition High Temperature Oxidation Intergranular Oxidation Transient Oxidation Morphology Behavior Scales Mechanisms Coatings Alloys
URL	查看原文
WOS记录号	WOS:000235484700002
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35236
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. J. Zhang,Z. G. Zhang,Y. Niu. Effect of Ag on the oxidation of beta-NiAl at 1173 to 1373K in 10(5)Pa oxygen atmosphere[J]. High Temperature Materials and Processes,2005,24(6):359-368.
APA	X. J. Zhang,Z. G. Zhang,&Y. Niu.(2005).Effect of Ag on the oxidation of beta-NiAl at 1173 to 1373K in 10(5)Pa oxygen atmosphere.High Temperature Materials and Processes,24(6),359-368.
MLA	X. J. Zhang,et al."Effect of Ag on the oxidation of beta-NiAl at 1173 to 1373K in 10(5)Pa oxygen atmosphere".High Temperature Materials and Processes 24.6(2005):359-368.