可控气氛下梯度涂层组织与结合性能分析  

Analysis of microstructure and binding ability of gradient coatings in controlled atmosphere

作　　者：董晓强[1] 罗超[1] 李德元[1] 段思华[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110178

出　　处：《焊接学报》2011年第2期57-60,116,共4页Transactions of The China Welding Institution

基　　金：沈阳市科技基金资助项目(200726164)

摘　　要：陶瓷梯度涂层的性能优良,在大气氛围下等离子喷涂制备的涂层会受到空气的氧化.针对这一情况,在可控气氛(氩)中采用等离子喷涂方法制取了Ni-Cr-B-Si/Al2O3的梯度涂层,与在空气中制取的Ni-Cr-B-Si/Al2O3梯度涂层进行了对比.分析了氩气氛围对梯度涂层显微组织和结合强度的影响.结果表明,在氩气中和空气中的梯度涂层组织内部都没有明显的界面,其组织呈连续变化;在氩气中制取的梯度涂层的组织更加致密,被氧化的程度更低,结合强度更高.Because ceramic gradient coating with excellent performance will be affected by air oxidation effects in air atmosphere plasma spray coating preparation,Ni-Cr-B-Si/Al2O3 gradient coating is prepared in controlled atmosphere(argon) plasma spraying.The atmospheric conditions of making Ni-Cr-B-Si/Al2O3 gradient coatings are compared,and the effects of argon atmosphere on the microstructure and bonding strength of sprayed gradient coating are analyzed.The results show that the inside organization of gradient coating in argon atmospheres and in air has no obvious interface and achieves continuous change of microstructure,but the gradient coating organization in argon is more dense,lower oxidative and has higher bonding strength than that in air.

关 键 词：可控气氛 等离子喷涂 氧化铝 梯度涂层 结合强度 

分 类 号：TG174.442[金属学及工艺—金属表面处理]