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| Research on microstructure of alumina/metal coating prepared by melting-casting |
| XUE Xiao-feng, WANG Ze-hua, ZHOU Ze-hua, SHAO Jia |
| College of Mechanics and Materials, Hehai University, Nanjing 210098, China |
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Abstract A sort of alumina/metal coating characterized by a bi-layered structure of Fe2O3+Cr2O3+Al plus NiO+Al layers, was successfully prepared on steel substrate by melting-casting technique. The microstructure, bonding status of the interface between the coating and the substrate, and the element distribution of the coating were studied. Results indicate that the coating is composed of α-Al2O3, Fe-Ni, Cr, AlNi3 and Fe-Cr. There is an excellent bonding between the coating and the substrate, and no hole or gap is found in the composite. Moreover, there is obvious element diffusion in the interface. The coating is composed of equiaxed grain, columnar grain, dendrites and lath phase. The elements present a uniform distribution in the interface but an obvious segregation in the middle of the coating. The segregation degree of metal elements is strengthened when extending the holding time.
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Received: 10 July 2014
Published: 29 April 2015
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2015, Vol. 25 
