Microstructure and Adhesion Strength of Al-Si-O \\Micro-arc Oxidation Coating

doi:10.3724/SP.J.1077.2006.00493

Abstract

Abstract:

A complex Al-Si-O ceramic coating was deposited on aluminium alloy by micro-arc oxidation (MAO). The composition and structure were analyzed by XRD and SEM, and the adhesion strength of the coating to substrate was investigated by thermal impact, mechanical impact and tensile tests. The results show that the coating
consists of a mixture of α-Al₂O₃, γ-Al₂O₃ and mullite. The coating surface is rough with anumber of the plasma discharge products. The coating can suffer mechanical impact and thermal impact of 600℃, it indicates that the coating possesses of good ductibility, thermal shock resistant and adhesion strength to the substrate. The tensile test shows that the adhesion strength of the coating to substrate is higher than 20MPa.

Key words: aluminium alloy, micro-arc oxidation, ceramic coating, adhesion strength

CLC Number:

TG174

XIN Shi-Gang,SONG Li-Xin,ZHAO Rong-Gen,HU Xing-Fang. Microstructure and Adhesion Strength of Al-Si-O \\Micro-arc Oxidation Coating[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2006.00493.

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Microstructure and Adhesion Strength of Al-Si-O \\Micro-arc Oxidation Coating

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