Influence of rare earth oxide coatings on oxidation behaviour of Fe-20Cr alloys

被引：19
|
作者：
Fernandes, SMC [1 ]
Ramanathan, LV [1 ]
机构：
[1] IPEN CNEN SP, BR-05422970 Sao Paulo, Brazil
来源：
SURFACE ENGINEERING | 2000年 / 16卷 / 04期
关键词：
D O I：
10.1179/026708400101517323
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This paper discusses the influence of coatings of praseodymium, dysprosium, and yttrium oxide gels on the oxidation behaviour of Fe-20Cr alloys. The morphology of the coatings was found to vary with the rare earth (RE) element used. The oxidation rates of Fe-20Cr specimens with all three RE oxide coatings were significantly lower than that of the uncoated alloy. The extent of influence on oxidation rate decreased in the following order: Pr, Dy, Y. The scale formed in the presence of RE oxides was a very thin, adherent chromia scale. Micrographic evidence of RE oxides in the chromia scales was found, further confirming the mechanism of scale growth in the presence of REs. Chromium ion diffusion is hindered by RE oxide coatings, making oxygen ion diffusion dominant. A direct correlation between RE ion radius and the extent of influence on chromia growth at 1000 degrees C has been found.
引用
收藏
页码：327 / 332
页数：6
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