QUN WANG (College of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, China) ZHENHUA CHEN (College of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, China) ZHANG XIONG DING (College of Energy and Engineering, Wuhan University of Technology, Wuhan, Hubei 430063, China) DING CHEN (College of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, China)
Abstract
Microstructure of WC reinforced Ni-based self-fluxing alloy composite coating sprayed and fused by oxy-acetylene flame was investigated by scanning electron microscopy and energy dispersive X-ray Spectrometry, X-ray diffraction, and transmission electron microscopy. The wear performance of the coating was studied by a MLS-225 wet sand rubber wheel abrasive wear tester at various loads and sizes of abrasive particles. Also, the wear resistance of the coating was compared with uncoated ASTM1020 steel. The results indicated that the coating is bonded metallurgically to the substrate and has a homogeneous microstructure composed of both coarse WC and fine carbide and boride grains such as Cr7C3, Cr23C6, and Ni2B which disperse uniformly in the matrix of γ-Ni solid solution and Ni3B. The worn mass loss of the coating and ASTM1020 steel both increased with the load and size of abrasive particles, also, the coating has exhibited excellent abrasive wear resistance compared with ASTM1020 steel.
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Article provided by World Scientific Publishing Co. Pte. Ltd. in its journal Surface Review and Letters.