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| Structure and wear--resistant properties of ceramic layer on LY12 Al alloy by micro--arc oxidation |
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| 中国科学院兰州化学物理研究所固体润滑国家重点实验室 |
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Cite this article:
. Structure and wear--resistant properties of ceramic layer on LY12 Al alloy by micro--arc oxidation. Chin J Mater Res, 2004, 18(2): 161-166.
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Abstract The morphology, content and structure of microarc oxidation ceramic
coatings produced on LY12 Al alloy have been investigated. The
microhardness, adhesion to the substrate and friction behavior under dry
friction and oil lubricating conditions were also measured. It is found
the microarc oxidation coatings consist of the loose superficial
layer and the inner dense layer. The two layers are composed of
$\alpha$--Al$_{2}$O$_{3}$ and $\gamma$--Al$_{2}$O$_{3}$, while the
Al--Si--O phase of high content is observed only in loose layer. The
$\alpha$--Al$_{2}$O$_{3}$ content in dense layer is distinctly higher
than that in loose layer. From the superficial layer to the substrate,
the cross--section microhardness first increases and then decreases,
reaching a maximum at a distance of 35 $\mu$m from the substrate/coating
interface. The adhesion strength of microarc oxidation coatings to Al
substrate is high and the critical load increases linearly with
increasing the coatings thickness. The microarc oxidation coatings
possess excellent antiwear properties, and the friction coefficient
under oil lubricating condition is only 1/10 of that under dry friction.
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Received: 21 May 2004
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