Effect of H-BN Content on Microstructures of the Laser Cladding Self- Lubricant Coatings
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.
Zhengyi Jiang, Xianghua Liu and Jinglong Bu
W. Niu et al., "Effect of H-BN Content on Microstructures of the Laser Cladding Self- Lubricant Coatings", Advanced Materials Research, Vols. 154-155, pp. 609-612, 2011