Microstructure and Properties of Laser Cladded Tin Bronze on the Surface of TC4 Titanium Alloy
Using X-ray diffractometer(XRD),energy dispersive spectrometer(EDS),scanning electron microscope(SEM),microhardness tester,friction and wear tester,effects of laser cladding power on microstructure and mechani-cal properties of cladded layer were investigated.The results indicate that the cladded tin bronze layer is mainly com-posed of Cui0Sn3,Cu6Sn5,Cu4Ti3,CuTi and Cu2O phases,which is well bonded to the substrate without pores and cracks.With the laser cladding power rising from 480 W to 640 W,the hardness of coating is increased gradually,reaching the maximum of 482 HV0.2at640 W,which is about 5.24 times of that of tin bronze,and 1.60 times of that of TC4 substrate.Meanwhile,the lowest friction coefficient of 0.51 and the minimum wear weight loss of 1.2 mg are obtained,which are lower than that of tin bronze and TC4 substrate.The wear resistance is 3.4 times higher than that of tin bronze,and 5.6 times higher than that of TC4 substrate.The wear mechanism of the coating is dominated by abrasive wear and oxidation wear.
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