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| MICROSTRUCTURE AND PROPERTIES OF Al2O3 CERAMIC COATING BY PLASMA SPRAYING AND LASER REMELTING ON MAGNESIUM ALLOY |
| 大连理工大学 |
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Cite this article:
. MICROSTRUCTURE AND PROPERTIES OF Al2O3 CERAMIC COATING BY PLASMA SPRAYING AND LASER REMELTING ON MAGNESIUM ALLOY. Acta Metall Sin, 2007, 43(5): 493-497 .
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Abstract Al2O3 ceramic coating is prepared by plasma spraying and laser remelting on AZ91HP Mg alloy. The results show that the plasma-sprayed Al2O3 coating consists of -Al2O3 and -Al2O3 phases with the macrostructure of lamellar stacking. After laser remelting, the coating exhibited obvious layer characteristic due to influence of temperature distribution, thermophysical parameters and layer thickness. According to the microstructural difference, the coating can be divided into the melted zone composed of the -Al2O3 columnar crystal, the sintered zone with flocculent-structure characteristic, the residual plasma-sprayed layer with loosen structure, Al-Si transition layer and the substrate. Because of fine structure and high density, the hardness, wear and corrosion resistances of the laser remelted coating are much higher than those of the plasma-sprayed coating and as-received Mg alloy.
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Received: 27 July 2006
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