Aluminizing Coating and Aluminizing-Y2O3 Coating Deposited by Pulsed Spark
来源期刊：JOURNAL OF RARE EARTHS2001年第3期
论文作者：高高唯 王德仁 何业东 齐惠滨 黄祖芬
Abstract: Aluminizing coating and aluminizing-dispersed Y2O3 composite coating were prepared on 20 steel specimens by pulsed spark technique, which exhibited a micro-crystallized structure with grain size in the range of several ten to several hundred nanometers. It is shown that, after oxidation at 600 ℃ in air for 100 h, these two kinds of coatings have excellent resistance to high temperature oxidation and scale spallation， and the aluminizing-dispersed Y2O3 composite coating has even better property than the aluminizing coating. AFM, SEM, EDS and XRD were applied to analyze the surface morphology, composition and phases structure of these coatings and the oxide scale formed in oxidation. The mechanism for these coatings that how to enhance the oxidation resistance and scale spallation resistance was discussed by considering the factors, such as Al concentration on the selective oxidation of Fe-Al alloy, the effect of micro-crystallization, reactive element effect (REE) caused by dispersed Y2O3, etc.
高高唯1，王德仁2，何业东2，齐惠滨2，黄祖芬2
(1.Department of Chemistry and Material Engineering, University of Auckland, Auckland, New Zealand;
2.Department of Surface Science and Corrosion Engineering, University of Science and Technology Beijing,)
Abstract:Aluminizing coating and aluminizing-dispersed Y2O3 composite coating were prepared on 20 steel specimens by pulsed spark technique, which exhibited a micro-crystallized structure with grain size in the range of several ten to several hundred nanometers. It is shown that, after oxidation at 600 ℃ in air for 100 h, these two kinds of coatings have excellent resistance to high temperature oxidation and scale spallation， and the aluminizing-dispersed Y2O3 composite coating has even better property than the aluminizing coating. AFM, SEM, EDS and XRD were applied to analyze the surface morphology, composition and phases structure of these coatings and the oxide scale formed in oxidation. The mechanism for these coatings that how to enhance the oxidation resistance and scale spallation resistance was discussed by considering the factors, such as Al concentration on the selective oxidation of Fe-Al alloy, the effect of micro-crystallization, reactive element effect (REE) caused by dispersed Y2O3, etc.
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