| SiC_p/Cu functionally gradient material is a novel composite material with the integrationof structure and function, which combines the excellent performance of SiC and Cu. It has abroad potential in future capplication due to their good combination of good electrical,thermal conductivity, high temperature resistance and wear resistance.In order to solve the problem of SiC and Cu wettability, firstly the SiC particle surface iscoated with a layer of Cu by electroless plating in present work, and to determine theoptimum electroless copper plating process. And then, SiC_p-Cu composite powder coatedwith Cu and Cu powder are mixed well. Finally, the SiC_p/Cu functional gradient materials(FGM) was prepared by laser cladding, and the microstructure of materials, thermalconductivity, density, hardness and wear resistance and so on are studied through varioustesting equipment. The experimental results show that:(1) If CuSO4·5H2O20g/L、 NaOH11g/L、 HCHO10mL/L、 Na2C4H4O650g/L,ɑ-ɑ’-bipyridyl20mg/L and40℃as the plating process of electroless copper plating, the effectof coating the Cu coating on the surface of SiC_pis better.(2) Cu matrix of SiC_p/Cu FGM is continuous, the interface between layer disappears,the distribution law of reinforced particles SiC_pis gradient. When SiC_pvolume content ishigher，aggregation phenomenon is serious; The part of the Cu be oxidized into Cu2O andCuO when FGM is prepared; FGM and cladding substrate are combined with good.(3) From the bottom to the surface of SiC_p/Cu FGM, it’s density decreased gradually，it’s thermal conductivity decreased gradually in normal temperature，it’s hardness graduallyimproved，when volume content of SiC_pis40%, decreased slightly。(4) Amount of wear of SiC_p/Cu composite gradually reduced with the increase of SiC_pvolume fraction, the wear resistance of the material improves gradually; SiC_p/Cu FGM hasbetter wear resistance than material Cu, and presents gradient distribution from the bottom tothe surface. |
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