【摘要】 为探索提高工程机械易损零部件服役寿命的新技术,采用等离子熔覆工艺,以Ni-Cr-C混合合金粉末为添加材料,在易损零部件用钢Q235表面形成了以初生块状金属陶瓷Cr7C3为硬质耐磨相,以强韧性良好的γ/Cr7C3共晶为基体的复合材料冶金涂层,分析了涂层的显微组织和硬度,在室温干滑动磨损条件下测试了其耐磨性。研究结果表明涂层组织致密,硬度较高,与基体之间为完全的冶金结合,在干滑动磨损条件下具有良好的耐磨性。更多还原

【Abstract】 In order to explore the new techniques for improving the service life of the easily damaged components of machines effectively, a wear resistant γ/Cr₇C₃ composite coating was fabricated on substrate of commercial Q235 plain carbon steel by plasma cladding using Ni-Cr-C elemental powder blends. The microstructure, microhardness and wear resistance of the coating were investigated and the wear mechanisms were analysed. The results show that the plasma clad composite coating has a compact and rapidly solidified microstructure consisting of primary coarse blocky carbide Cr₇C₃ and the inter-blocky tough γ/Cr₇C₃ eutectic matrix and is metallurgically bonded to the steel substrate. The composite coating possesses high hardness and excellent wear resistance under dry sliding wear test conditions.更多还原