Laser cladding of Al2O3 coating on aluminium alloy by thermite reactions

被引：30

作者：

Yue, TM ^{[1
]}

Huang, KJ ^{[1
]}

Man, HC ^{[1
]}

机构：

[1] Hong Kong Polytech Univ, Dept Ind & Syst Engn, Adv Mfg Technol Res Ctr, Hong Kong, Hong Kong, Peoples R China

来源：

SURFACE & COATINGS TECHNOLOGY | 2005年 / 194卷 / 2-3期

关键词：

thermite reaction; laser; cladding; aluminium alloy; interfaces;

D O I：

10.1016/j.surfcoat.2004.09.026

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Based on the principle of the thermite reaction of CuO and Al powders, an Al2O3 ceramic coating was produced on an aluminium AA7075 alloy substrate by means of laser cladding. SEM, XRD and TEM techniques were employed to study the phases of the coating. The results show that the top coating is a layer of Al2O3, below which is the fusion layer and the substrate. The Al2O3 layer primarily consists of the alpha-Al2O3 and gamma-Al2O3 phases. The mechanism of the formation of the top A1203 layer is explained. It involves a series of thermite reactions and the decomposition of CuO powders. The amount of gamma-Al2O3 phase present is considered to be governed by the solidification time available for the formation of the phase. Good interfacial bonding is achieved at the fusion layer/gamma-Al2O3 phase interface. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：232 / 237

页数：6

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