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3867 |
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TEM analysis of re-melted Ni60 coating on the surface of compacted iron through flame spraying
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Peihu Gao* / Xi'an Technological University, China Jianping Li/ School of Materials and Chemical Engineering, Xian Technological University, China Zhong Yang/ School of Materials and Chemical Engineering, Xian Technological University, China Yongchun Guo/ School of Materials and Chemical Engineering, Xian Technological University, China Wei Zhou/ Shaanxi Bangxin Surface Engineering Company, China |
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Ni60 Coating was adopted to protect compacted iron worn surface. Ni60 coating was deposited and re-melted on the surface of compacted iron through oxygen-acetylene flame spraying. The microstructure and phases of re-melted Ni60 coating were investigated through SEM, TEM and XRD. The microhardness was characterized by vickers hardness tester. It was found that there were Ni2.9Cr0.7Fe0.36, Ni3B, BCr, B0.44C1.41Cr3 phases formed besides the matrix phase in the re-melted Ni60 coating. The Ni2.9Cr0.7Fe0.36 was small black dot in the cross-section of Ni60. The Ni3B was grey block. The BCr was dendritic. The B0.44C1.41Cr3 was black blocky. The microhardness of Ni60 was 603.6Hv, which was three times higher than the microhardness of compacted iron, which was about 209.9Hv. It would make the compacted iron protected by re-melted Ni60 coating. |