纳米Sm2O3增强TiC/Co基复合涂层微观组织和耐磨性能研究

利用激光熔覆技术在45钢表面制备了纳米Sm₂O₃增强TiC/Co基复合涂层,系统研究了纳米Sm₂O₃对TiC/Co基复合涂层宏观形貌、微观组织和耐磨性能的影响.结果表明:纳米Sm₂O₃增强TiC/Co基复合涂层主要由γ-Co、Cr₂₃C₆、TiC、Co₃Ti和Fe₇Sm相组成.纳米Sm₂O₃增强TiC/Co基复合涂层呈现出与基体形成更加优良的冶金结合和优良的润湿性,显微组织明显细小均匀.随着纳米Sm₂O₃含量增加,复合涂层的显微硬度和耐磨性能均先增加后降低,当纳米Sm₂O₃质量分数为1.5%时,复合涂层的显微硬度和耐磨性能分别提高了10.1%和17.1%.添加纳米Sm₂O₃的复合涂层的磨损机理均为...

Microstructure and Wear Resistance of TiC Reinforced Co-Based Composite Coatings Modified with Nano-Sm2O3 by Laser Cladding

Nano-Sm₂O₃ particles reinforced TiC/Co-based composite coatings were prepared on 45 steel by laser cladding. The effect of nano-Sm₂O₃ particles on the microstructure and wear resistance of TiC/Co-based composite coatings was investigated systematically. The results showed that the phase constitute of nano-Sm₂O₃ particles reinforced TiC/Co-based composite coatings was composed of γ-Co, Cr₂₃C₆, TiC, Co₃Ti, Cr₃C₂ and Fe₇Sm, and the composite coatings showed better metallurgical bonding with the substrate, better spreadability, finer grains and more uniform microstructure in compared with coatings without nano-Sm₂O₃ particles. With the increase of nano-Sm₂O₃ addition, the microhardness and wear resistance of TiC/Co-based composite coatings were both first enhanced and then reduced, and the microhardness and wear resistance were respectively improved by 10.10% and 17.14%, for 1.5% nano-Sm₂O₃ addition. The wear mechanism of the composite coatings was abrasive wear. A significant influence of nano-Sm₂O₃ on the TiC reinforced Co-based composite coatings was confirmed by the results of applied multivariate statistical analysis.