Preparation and performance of a cold gas dynamic sprayed high-aluminum bronze coating
来源期刊：International Journal of Minerals Metallurgy and Materials2018年第11期
论文作者：Li Feng Chang Guan Ji-rong Chang Hai-min Zhai Guo-sheng An Wen-sheng Li
文章页码：1354 - 1361
摘 要：By mixing preheated high-aluminum bronze powders with different amounts of Al2O3 powder, a low-pressure cold-sprayed coating was prepared and sprayed onto a Cr12MoV steel substrate. The hardness of the coating and the bonding strength between the coating and the substrate were tested with a HV-1000 microhardness tester and a mechanical universal testing machine. The surface microstructure, cross-section and tensile fracture surface of the coating were observed with a scanning electron microscope（SEM）. Correspondingly, the influences of the preheat treatment temperature of the bronze powder and the Al2O3 content on the coating performance were investigated. The results indicate that the hardness of bronze powders decreased and the coating deposition rate increased after the preheating treatment of the bronze powder. The Al2O3 content in the mixed powders contributed to the deformation of bronze powders during the spraying process. This trend resulted in varied performance of the coating.
Li Feng1,2，Chang Guan1，Ji-rong Chang1，Hai-min Zhai1,2，Guo-sheng An1,2，Wen-sheng Li1,2
1. School of Materials Science and Engineering,Lanzhou University of Technology2. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals
摘 要：By mixing preheated high-aluminum bronze powders with different amounts of Al2O3 powder, a low-pressure cold-sprayed coating was prepared and sprayed onto a Cr12MoV steel substrate. The hardness of the coating and the bonding strength between the coating and the substrate were tested with a HV-1000 microhardness tester and a mechanical universal testing machine. The surface microstructure, cross-section and tensile fracture surface of the coating were observed with a scanning electron microscope（SEM）. Correspondingly, the influences of the preheat treatment temperature of the bronze powder and the Al2O3 content on the coating performance were investigated. The results indicate that the hardness of bronze powders decreased and the coating deposition rate increased after the preheating treatment of the bronze powder. The Al2O3 content in the mixed powders contributed to the deformation of bronze powders during the spraying process. This trend resulted in varied performance of the coating.
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