纳米SiO_2颗粒增强镍基复合镀层的组织与微动磨损性能研究  

Microstructure and Fretting Wear Behavior of Ni based Composite Coatings Reinforced by SiO_2 Nanoparticles

作　　者：王红美[1] 蒋斌[2] 徐滨士[1] 马世宁[1] 董世运[1] 

机构地区：[1]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072 [2]重庆大学材料科学与工程学院,重庆400044

出　　处：《摩擦学学报》2005年第4期289-293,共5页Tribology

基　　金：国家自然科学基金重点项目资助(50235030);国家重点基础研究发展规划项目资助(G1999065009);中英科技合作项目资助(2002M3).

摘　　要：采用电刷镀技术在45#钢表面制备了纳米SiO2颗粒增强镍基复合镀层,用扫描电子显微镜和透射电子显微镜观察分析了复合镀层的表面形貌和微观组织形貌,用纳米压痕仪测试了复合镀层的微观力学性能,并采用PLINT型高温微动疲劳试验机考察了复合镀层在室温至500℃下的微动磨损行为.结果表明:纳米SiO2颗粒促进了镀层的晶粒细化,提高了镀层的力学性能,复合镀层的硬度和弹性模量分别比镍镀层提高了2.01GPa和5GPa,从而改善了镀层的微动磨损性能;复合镀层的耐磨性能约为镍镀层的2倍,这是由于纳米SiO2颗粒对复合镀层具有超细晶强化、硬质点弥散强化以及高密度位错强化机制所致.Ni based composite coatings reinforced by SiO1 nanopartlcles were preparea on AISI-1045 steel by electro-brush plating. Surface morphologies and microstructures were observed by scanning electron microscope and transmission electron microscope, their micro mechanical properties were examined by nano indentation, and fretting wear behavior from room temperature to 500℃ was investigated on a PLINT fretting wear test rig. It was found that incorporation of SiO2 nanoparticles refined microstructure and increased mechanical properties, which led to improvement of anti-fretting wear of composite coatings. Antifretting wear of composite coatings was improved by 2 times, which was attributed to thinner crystals strengthening, dispersion strengthening and high-density dislocations strengthening of SiO2 nanoparticles in the composite coatings.

关 键 词：纳米SIO2 复合镀层 微动磨损性能 微观力学性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TH117.3[金属学及工艺—金属学]