激光重熔对NiCrBSi等离子喷涂层显微结构和性能的影响  

Effect of Laser Remelting on Microstructure and Properties of Plasma Sprayed NiCrBSi Coating

作　　者：尹斌[1,2] 周惠娣[1] 徐海燕[1] 陈建敏[1] 阎逢元[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [2]中国科学院北京研究生院,北京100049

出　　处：《材料保护》2011年第3期71-73,91,共3页Materials Protection

基　　金：国家自然科学基金委创新研究群体科学基金项目(50421502);国家973计划资助项目(2007CB607601)资助

摘　　要：1Cr18Ni9Ti不锈钢表面的NiCrBSi等离子喷涂层存在孔洞及与基体结合差等缺陷,为此进行了激光重熔处理。采用扫描电镜和显微硬度压痕仪分别对涂层的显微结构和力学性能进行了对比研究,采用SRV试验机评价了涂层激光重熔前后的滑动摩擦磨损性能,研究了激光重熔对NiCrBSi等离子喷涂层结构和性能的影响。结果表明:经过激光重熔后,等离子喷涂层中的孔洞、裂缝以及未熔颗粒等缺陷得到了消除;激光重熔层的致密度大大提高,涂层与基体呈冶金结合,涂层的显微硬度明显提高;激光重熔层的抗磨性能约为等离子喷涂层的2倍。A scanning electron spectroscope and a microhardness indentation tester were used to study the microstructure and mechanical properties of plasma sprayed NiCrBSi coatings before and after laser remelting,and the sliding wear behavior of the coatings was investigated.It was found that defects like pores,cracks and unmelted particles were eliminated by laser remelting,resulting in increased density and hardness of the coating.The laser remelted coating had metallurgical bonding,and was twice the anti-wear ability of as-sprayed coating.

关 键 词：激光重熔 等离子喷涂 NiCrBSi涂层 显微硬度 摩擦磨损 

分 类 号：TG174.442[金属学及工艺—金属表面处理]