Papers by Author: Wei Niu

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Authors: Wei Niu, Rong Lu Sun, Yi Wen Lei
Abstract: Self-lubricating Ni+h-BN coatings were prepared by CO2 laser cladding with powder mixtures of Ni60 and h-BN. The chemical compositions and microstructures of the coatings were analyzed using SEM and XRD. The microhardness of the coatings was measured on a microhardness tester. It was found that the morphology of CrB was changed from irregular block-like shape (in Ni60+5%h-BN coating) →short–plate structure (in Ni60+10%h-BN coating)→dendritic-plate structure(in Ni60+15%h-BN coating) with increasing the content of h-BN. The microhardness of the 5,10 and 15% h-BN coatings ranged from 650~800HV0.2, 800~1010HV0.2 and 1000~1200HV0.2, which was higher than that of Ni60 coating and substrate.
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Authors: Wei Niu, Rong Lu Sun, Yi Wen Lei
Abstract: Self-lubricating h-BN/Ni coating was prepared on a medium carbon steel substrate by CO2 laser cladding using a powder mixture of NiCrBSi+5%h-BN(wt.%). Microstructures and phase structure of the coating were analyzed using SEM, EDS and XRD. Wear tests were carried out using a M100 pin-on-ring wear tester. The results show that h-BN/Ni coating has much superior war resistance and noticeably lower fiction coefficient under dry sliding wear test conditions.
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