过渡材料对等离子喷涂Al_2O_3梯度陶瓷涂层性能影响  

Influence of transitive materials on Al_2O_3 gradient ceramic coatings prepared by plasma spraying

作　　者：雷阿利[1] 李高宏[1] 冯拉俊[1] 徐大鹏[1] 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048

出　　处：《焊接学报》2007年第10期25-28,共4页Transactions of The China Welding Institution

基　　金：陕西省自然科学基金资助项目(2006B22)

摘　　要：针对Al2O3陶瓷涂层结合强度低、孔隙率高的实际,选择NiAl金属间化合物和金属铜粉作为过渡材料,利用等离子喷涂制备Al2O3梯度陶瓷涂层,并对梯度涂层进行组织形貌观察,测试结合强度和孔隙率。结果表明,梯度涂层的组织表现出宏观的不均匀性和微观连续性的分布特征,NiAl和Cu是金属基体与Al2O3涂层之间过渡层的理想材料,可以有效地提高涂层的结合强度,而Cu-Al2O3梯度涂层又比NiAl-Al2O3梯度涂层结合强度高;梯度涂层的孔隙率远低于双涂层的孔隙率,在Cu-Al2O3梯度涂层中随AlO含量的增加,涂层的孔隙率降低,而且孔隙率低于NiAl-AlO梯度涂层。According to the fact that Al2O3 ceramic coatings have low adhesion strength and high porosity, two kinds of Al2O3 gradient ceramic coatings using NiAl intermetallic compound and Cu powders as transitive materials respectively were prepared by plasma spraying, and the microstructure of gradient coatings was observed, and the adhesion strength and porosity of the coatings were tested and analyzed. The results indicate that the gradient coatings show that the characteristic of structure is not uniform macroscopically but consecutive microscopically. NiAl intermetallic compound and Cu are ideal transitive materials between metal matrix and Al2O3 coatings, which can improve the adhesion strength of the coatings efficiently. The adhesion strength of Cu-Al2O3 gradient coatings is higher than that of NiAl-Al2O3 gradient coatings. The porosity of gradient coatings is lower than that of double layer coatings. The porosity of Cu-Al2O3 gradient coatings decreases as the Al2O3 content increases, and it is lower than that of NiAl-Al2O3 gradient coatings.

关 键 词：等离子喷涂 梯度涂层 AL2O3陶瓷涂层 

分 类 号：TG174[金属学及工艺—金属表面处理]