| 摘要: |
| 以钼粉、硅粉为原料,利用氩弧熔覆技术在Q235钢基材表面原位合成了FeMoSi/Fe3Si金属硅化物复合涂层,应用SEM,XRD对涂层的显微组织和物相进行了分析,并测试了涂层显微硬度和常温耐磨性.结果表明,复合涂层与基体界面无气孔、裂纹,呈冶金结合;复合材料涂层由α-Fe,初生相FeMoSi三元金属硅化物树枝晶和枝晶间的鱼骨状FeMoSi/Fe3Si共晶组织组成;涂层的显微硬度达到1000 HV0.2,较基体提高3倍左右;相对耐磨性较基体Q235钢提高近11倍。 |
| 关键词: 氩弧熔覆 复合涂层 原位合成 耐磨性 |
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| 基金项目:哈尔滨市青年科技创新基金项目(RC2009QN017080);黑龙江省教育厅项目(11511351);科技学院引进人才项目(07-57) |
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| Analysis on property and microstructure of Mo-Si composite coating deposited by argon shielded arc on Q235 steel surface |
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WANG Yongdong, LIU Xing, ZHU Yan, MAO Xinyu
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Department of Material Science and Technology, Heilongjiang Institute of Science and Technology, Harbin 150022, China
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| Abstract: |
| Metal-silicide composite coating of FeMoSi/Fei3Si was prepared by in situ synthesis on the surface of Q235 steel by means of argon arc cladding technique with the pre-alloyed powder of Mo and Si.The microstructure and phases of coating were investigated by scanning electron microscope(SEM) and X-ray diffraction(XRD), meanwhile the microhardness and the wear resistance of coating were tested.The results show that the interface between the coating and substrate has excellent bonding and is free of pores and cracks.Microstructure of the coating is mainly composed of α-Fe, primary dendrite FeMoSi and interdendritic FeMoSi/Fe3Si eutectic structure.The microhardness was 3 times higher than that of Q235 steel and the maximum microhardness can reach 1 000 HV0.2, the wear resistance of coating was 11 times higher than that of Q235 steel substrate. |
| Key words: argon arc cladding composite coating situ synthesis wear resistance |
