文档介绍：B70 AZ91D 镁合金表面等离子喷涂陶瓷复合涂层的组织和性
能
芦笙 1,陈燕 1,陈静 2,段珍珍 1
(江苏科技大学 , ,江苏镇江 212003)
摘要:利用等离子喷涂技术在 AZ91D 镁合金基体上用 Ni/Al 打底,制备 Al2O3 涂层(A)、Al2O3-13%TiO2
涂层(AT13)、Al2O3-20% TiO2 涂层(AT20)及 A-AT13-AT20 过渡涂层等复合涂层。对喷涂涂层的显微硬度、
结合强度、抗热震性能进行了研究,并分析了涂层的形貌、微观结构,比较了 AZ91D 镁合金喷涂复合涂
层后的耐磨损性能和腐蚀特性。试验结果表明,在 AZ91D 镁合金基体表面喷涂陶瓷层后大大提高了基体
的硬度,且 Al2O3 涂层的硬度明显高于 AT13、AT20 陶瓷层。粘结层起了很好的连接陶瓷涂层与基体的作
用,含 Ni/Al 粘结层的涂层的结合强度较无粘结层的高,并且 AT13 涂层的结合强度是几种涂层中最高的。
在相同的摩擦磨损试验条件下,AT13 涂层表现出比其他涂层优异的耐磨性,磨损机制均主要为脆性疲劳
引起的微观剥落和磨粒磨损。涂层的腐蚀主要为全面腐蚀,涂层较基体更耐腐蚀,A-AT13-AT20 过渡涂
层的耐腐蚀性能优于 AT20 涂层。
关键词:AZ91D 镁合金;等离子喷涂;涂层;结合强度
Microstructure and properties of plasma-posite
ceramic coatings on AZ91D magnesium alloy
LU Sheng1, CHEN Yan1,CHEN Jing2, Duan Zhen-zhen1
( of Materials Science and Engineering, of Mechanical Engineering
Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, 212003, . China)
Abstract: The bonding coating of Ni/Al and the working coatings of Al2O3(A),
Al2O3-13%TiO2(AT13), Al2O3-20%TiO2(AT20) and A-AT13-AT20 transition coatings were
prepared on AZ91D magnesium alloy substrate by plasma-spraying in this paper. The
micro-hardness, bond strength and anti-thermal shock property of the coatings were investigated.
The surface morphology and microstructure were analyzed. What’s more, the wear resistance and
the corros