| PAN Cheng-gang,WU Zhu,DING Zi-zheng,CHANG Qing-ming.Microstructure and Wear Properties of Cu-coated SiCp/Ni35 Coating by Laser Cladding[J],46(12):110-117 |
| Microstructure and Wear Properties of Cu-coated SiCp/Ni35 Coating by Laser Cladding |
| Received:September 26, 2017 Revised:December 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.12.019 |
| KeyWord:laser cladding Cu-coated SiCp Ni35 wear |
| Author | Institution |
| PAN Cheng-gang |
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan , China |
| WU Zhu |
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan , China |
| DING Zi-zheng |
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan , China |
| CHANG Qing-ming |
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan , China |
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| Abstract: |
| The work aims to study microstructures, phases and friction mechanism at 25 ℃ and 600 ℃ of Cu-coated SiCp/Ni35 laser clad coating. The Cu-coated SiCp was prepared in the method of electroless plating, and the Cu-coated SiCp-reinforced N35 clad coating was prepared on H13 steel by laser cladding. Phase, microstructure and composition of the clad coating were analyzed with XRD, OM, SEM and EDS. Microhardness of the clad coating was tested with microharness tester, and wear resistances at room temperature and high temperature were tested by high temperature wear tester. The clad coating was composed of matrix phase γ-Ni(Fe) solid solution, reinforced phase M7C3, borides, silicide and graphite. Microhardness and friction property at room temperature of the clad coating are significantly higher than those of H13 steel, while wear resistance of the coating at high temperature has only a little increase than that of H13 steel. Cu coated SiCp can slow down the decomposition of SiCp in laser cladding process, but the decomposition rate is too high. High hardness carbide and silicide in the coating can improve wear resistance at room temperature. Dense oxide film forms on the surface of die steel at high temperature, which can reduce wear and friction; no dense oxide film forms on the clad coating at high temperature, which leads to lower wear resistance than that at room temperature. |
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