反应等离子熔覆高铬铁基金属陶瓷增强耐磨涂层组织与性能

摘要

利用反应等离子熔覆技术、以Fe-Cr-C-W-Ni合金粉末为原料,在Q235钢表面制得了Cr7C3高铬铁基金属陶瓷增强耐磨复合涂层.利用SEM、EDS和X射线衍射分析了涂层的显微组织,在室温干滑动磨损试验条件下测试了涂层的耐磨性.结果表明:反应等离子熔覆CE7C3高铬铁基金属陶瓷增强耐磨复合涂层硬度高、组织均匀、与基材之间为完全冶金结合;涂层在室温干滑动磨损试验条件下表现出优异的耐磨性,涂层磨损的质量损失随载荷增加十分缓慢,涂层具有优异的载荷特性.%A wear resistant high chromium iron based ceramic reinforcing wear-resistance coating was fabricated on substrate of a Q235 steel by plasma cladding using the Fe-Cr-C-W-Ni alloy powders. Microstructure of the coating was characterized by OM, SEM, EDS and XRD. Wear resistance of the coating was tested under dry sliding wear condition at room temperature. Results indicate that the plasma clad high chromium iron based ceramic reinforced wear-resistance composite coating has a rapidly solidified homogeneous microstructure consisting of Cr7C3 ceramal primary particles uniformly distributed in the Cr7C3/γ-Fe eutectic matrix and is metallurgically bonded to the Q235 steel substrate. The plasma clad composite coating has high hardness and excellent wear resistance under dry sliding wear test conditions. Wear mass loss of the coating is increased slowly with the load increased and it has excellent load characteristic.