纳米Y_2O_3弥散强化Ni基合金激光熔覆层  

Nano-Y_2O_3 Dispersion Strengthened Ni-Based Alloy Laser Coating

作　　者：张世宏[1] 李明喜[1] 李辉生[1] 何宜柱[1] 

机构地区：[1]安徽工业大学激光加工研究中心,安徽马鞍山243002

出　　处：《热加工工艺》2006年第6期17-19,共3页Hot Working Technology

基　　金：安徽省教育厅自然科学研究重点项目(2005KJ038ZD);安微省科技厅项目(04022004)

摘　　要：研究了纳米Y2O3对Ni基合金激光熔覆层显微组织、相结构和性能的影响。结果表明:加入纳米Y2O3 的Ni基激光熔覆层出现大量细小、无方向性生长的等轴晶;熔覆层主相为γ-Ni,此外还有Cr23C6、Ni4.6Si2B和 Ni17Y2等;加入1．5％纳米Y2O3的熔覆层显微硬度值大幅度提高,其耐磨性比纯Ni基提高5倍多,磨损机理由较为严重的粘着磨损转变为微动磨损。The effects nano-Y2O3 particles on the microstructure, phase composition, and properties of Ni-bascd cladding layer were investigated. The results indicate that fine and equaixed dendrite was observed by adding nano-Y2O3. The XRD results show that γ-Ni, Cr23C6, Ni4.6Si2B and Ni17Y2 existed in the coatings. The coatings with the best microhardness and ware resistance arc manufactured when laser power is 2.0 kW by adding 1.5% Y2O3. The wear mechanism is found from abrasive wear to fretting wear.

关 键 词：激光熔覆 纳米Y2O3 显微组织 弥散强化 性能 

分 类 号：TG156.99[金属学及工艺—热处理] TG174.44[金属学及工艺—金属学]