激光重熔双模态Al_2O_3-TiO_2复合涂层的组织与性能  

Microstructure and properties of bimodal laser-remelted Al_2O_3-TiO_2 composite coatings

作　　者：李崇桂[1] 王铀[2] 封小松 闫华[1] 张培磊[1] 于治水[1] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]哈尔滨工业大学材料科学系,黑龙江哈尔滨150001 [3]上海航天设备制造总厂,上海200245

出　　处：《材料热处理学报》2013年第7期147-153,共7页Transactions of Materials and Heat Treatment

基　　金：上海高校一流学科建设计划(YLJX12-2);上海市教育委员会科研创新项目(12ZZ186;13YZ114);上海高校青年教师培养资助计划(shgcjs002);上海工程技术大学科研基金项目(校启2011-07;2012gp22);上海航天科技创新基金项目(SAST201207)

摘　　要：采用普通Metco 130粉末及纳米结构Al2O3-13%TiO2粉末通过等离子喷涂和激光重熔复合技术分别在Ti-6Al-4V合金表面制备了激光重熔涂层。采用扫描电镜(SEM)和维氏硬度计等手段观察和研究了激光重熔前后涂层的微观组织和硬度。结果表明,激光重熔后,消除了等离子喷涂涂层的层状结构,获得了致密的重熔涂层,且纳米结构重熔涂层传承了喷涂态涂层的双模态组织特征。随着扫描速度的降低,涂层表面的致密度提高。纳米结构重熔涂层的硬度为1150 HV 0.3至1750 HV 0.3,比重熔之前的喷涂态涂层约提高了60%。Conventional Metco 130 and nanostructured Al2O3-13%TiO2 feedstock powders were plasma sprayed and laser remelted to form Al2O3-13%TiO2 coatings on Ti-6Al-4V substrate.The microstructure of the coatings before and after laser remelting was investigated by scanning electron microscope（SEM）.The microhardness of the coatings was evaluated by a Vickers microhardness tester.The results indicate that the lamellar structure of the plasma sprayed coatings is eliminated to form dense coatings after laser remelting.The bimodal microstructure feature of the as-sprayed coatings is retained in the laser-remelted nanostructured coatings.With the decrease of the scanning speed,the density of the coating surface is increased.The hardness of the laser-remelted nanostructured coatings is between 1150 HV0.3 and 1750 HV0.3,with an increase of 60% compared with that of the as-sprayed coatings.

关 键 词：等离子喷涂 激光重熔 Al2O3-TiO2涂层 钛合金 双模态组织 

分 类 号：TG174.453[金属学及工艺—金属表面处理]