Transient oxidation behavior of nanocrystalline CoCrAlY coating at 1050 ℃

被引：4

作者：

刘光明 ^{[1
]}

李美栓 ^{[1
]}

马敬翙 ^{[2
]}

杜楠 ^{[2
]}

周延春 ^{[1
]}

机构：

[1] Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences

[2] School of Materials Science and Engineering, Nanchang Institute of Aeronautical Technology

来源：

TransactionsofNonferrousMetalsSocietyofChina | 2007年 / 03期

关键词：

CoCrAlY coating; oxidation; Al2O3; phase transformation;

D O I：

暂无

中图分类号：

TG174.444 [真空镀与气相镀法];

学科分类号：

080503 ;

摘要：

Nanocrystalline CoCrAlY overlay coating was prepared on M38G superalloy by magnetron sputtering deposition. To investigate the oxidation behavior and phase transformation of alumina during oxidation, the oxidation experiments were conducted at 1 050 ℃ for various time in the range of 5?180 min. The phase compositions of the oxide scales were investigated by using glancing angle X-ray diffraction(XRD). The microstructure analysis of oxide scales was carried out by means of scanning electron microscopy(SEM). The growth process of metastable alumina at the grain boundaries and transformation to stable alumina were discussed. The results show that at the initial oxidation stage the mixture of δ-Al2O3, γ-Al2O3 and α-Al2O3 is formed on the sample surface rapidly. Especially, δ-Al2O3 and γ-Al2O3 prefer growing at the grain boundaries of CoCrAlY coating. With increasing oxidation time, δ-Al2O3 and γ-Al2O3 transform to θ-Al2O3, afterwards θ-Al2O3 transforms to α-Al2O3 gradually. After 180 min oxidation, θ-Al2O3 transforms into α-Al2O3 completely.

引用

页码：595 / 599

页数：5

共 5 条

[1]

Transient-Alumina Transformations During the Oxidation of Magnetron-Sputtered CoCrAl Nanocrystalline Coatings[J] . X. Peng,D.R. Clarke,F. Wang.Oxidation of Metals . 2003 (3)

[2]

Effect of the θ–α-Al2O3 Transformation in Scales on the Oxidation Behavior of a Nickel-Base Superalloy with an Aluminide Diffusion Coating[J] . T. F. An,H. R. Guan,X. F. Sun,Z. Q. Hu.Oxidation of Metals . 2000 (3)

[3]

Experimental observations in support of the dynamic-segregation theory to explain the reactive-element effect[J] . B. A. Pint.Oxidation of Metals . 1996 (1-2)

[4]

Effect of the θ-α -Al 2 O 3 transformation on the oxidation behavior of β -NiAl + Zr[J] . George C. Rybicki,James L. Smialek.Oxidation of Metals . 1989 (3)

[5]

Effect of polymorphism of Al2O3 on the synthesis of magnesium aluminate. ZHANG Z H, LI N. Ceramics International . 2005

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