【摘要】 以Ni60+35%WC合金粉末为原料,采用等离子熔覆技术,在H13模具钢基体上熔覆WC/Ni基复合涂层。借助SEM、XRD分析涂层的显微组织;利用显微硬度计测试涂层的显微硬度;通过环-块磨损实验在MM-200磨损试验机上评估涂层的耐磨性能;采用线性极化法研究涂层在3.5%NaCl溶液中的耐蚀性能。结果表明:涂层组织均匀细小,主要由γ-(Ni,Fe)树枝晶以及枝晶间的γ-(Ni,Fe)与Cr23C6、Fe3W3C形成的共晶结构组成,在涂层底部分布有WC增强相;涂层的显微硬度可达590~650HV0.3;在室温干滑动磨损条件下,涂层的耐滑动磨损性与基体相比提高了1倍以上。在3.5%NaCl溶液中,涂层的耐腐蚀性能优于H13钢基体。H13钢经等离子熔覆WC/Ni基复合涂层后耐磨性能、耐蚀性能得到提高,可用于H13钢制模具的表面磨损修复。更多还原

【Abstract】 To study the microstructure and properties of WC/Ni composite coating,by plasma cladding technology,a WC/Ni composite coating is prepared on H13 die steel.The microstructure of the composite coating is analyzed by scanning electron microscope(SEM),X-ray diffraction(XRD).The microhardness,are resistance performance,and corrosion resistance of the coating is tested by microhardness tester,a MM-200block-on-wheel sliding wear tester,and by linear polarization respectively.The experimental results indicate that the microstructure of the coating is mainly consisted ofγ-(Ni,Fe),Cr23C6,Fe3W3 C.The microhardness of the coating varies from 590 to 650HV0.3,and the wear resistance of the coating is increased more than 1times compared with substrate.The corrosion resistance test demonstrates that the corrosion resistance of the coating is better than substrate in 3.5% NaCl solution.The wear resistance and the corrosion resistance of WC/Ni composite coating is enhanced greatly and it would be used to repair the surface of H13 steel die.更多还原