Influence of reactive element oxide coatings on the high temperature cyclic oxidation of chromia-forming steels

被引:20
作者
Chevalier, S [1 ]
Larpin, JP [1 ]
机构
[1] Univ Bourgogne, Lab Rech React Solides, UMR 5613, CNRS, F-21078 Dijon, France
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2003年 / 363卷 / 1-2期
关键词
reactive element effect; Y2O3; Nd2O3; Yb2O3; MOCVD coatings; cyclic experiments; oxide scale adhesion;
D O I
10.1016/S0921-5093(03)00592-6
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The beneficial effects of reactive element oxide coatings, Y2O3, Nd2O3 and Yb2O3, on the cyclic oxidation behaviour of a Fe-30Cr model alloy, were studied at 950degreesC in air under atmospheric pressure. The oxide scale grown on uncoated samples started to spall after 2 cycles, because of its poor adherence. The coated specimens remarkably resisted to the thermal shocks, since no oxide scale spallation or cracks could be observed, even after 1000 h of cycling experiments. The surface oxide scale consisted of facetted oxide grains on the uncoated samples. On the contrary, it exhibited a fine-grained structure on the coated specimens. The reactive element beneficial effect was ascribed to reactive element ions or second phase particles segregation along the chromia grain boundaries, minimising the chromium cation outward diffusion. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:116 / 125
页数:10
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