Properties of aluminium alloy ceramic coating prepared by microarc oxidation

被引：0
作者：
Wu, HH [1 ]
Yu, FR
Li, JJ
Lu, XY
Jin, ZS
机构：
[1] Jilin Univ, Natl Key Lab Superhard Mat, Changchun 130021, Peoples R China
[2] Jilin Univ, Phys Acad, Changchun 130021, Peoples R China
来源：
JOURNAL OF INORGANIC MATERIALS | 2004年 / 19卷 / 03期
关键词：
microarc oxidation; ceramic coatings; surface morphology; phase component;
D O I：
暂无
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Under the condition of keeping impulse amplitude of alternating voltage constant, microarc oxidation of aluminium alloy in aqueous solution containing sodium silicate and sodium hydroxide was carried by means of alternating current power supply. It is found that the current passing through the sample is divided obviously into five different stages with the oxidation time. The ceramic coatings prepared in the different stages were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The result shows that the ceramic coatings mainly contain gamma-Al2O3, alpha-Al2O3 phases; the gamma-Al2O3 and alpha-Al2O3 contents are close relative to oxidation time. The difference of gamma-Al2O3 and alpha-Al2O3 contents between external layer and internal layer of the coating is mainly caused by the change of cooling rate of molten alumina in microarc zone.
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页码：617 / 622
页数：6
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