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4689 |
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Thursday, May 12, 2016, Room 3C + 3D 11:00 AM Iron-based Coatings |
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Microstructure and thermal conductivity of wire-arc sprayed FeCrNbBSi coatings |
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Zihao Qian* / College of materials science and engineering, Beijing university of technology , China Zheng Zhou / College of materials science and engineering, Beijing university of technology, China Haihua Yao/ College of materials science and engineering, Beijing university of technology, China Xu Wu/ College of materials science and engineering, Beijing university of technology, China Yiming Wang/ College of materials science and engineering, Beijing university of technology, China Dingyong He/ College of materials science and engineering, Beijing university of technology, China |
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A new FeCrNbBSi-cored wire was designed to produce protective coatings by wire arc spraying. The phase composition, microstructure, microhardness and thermal conductivity of the new coating were investigated compared with a commercial stain steel wires (SS316) under the same condition. The microstructure study shows that the as-deposited coatings present a dense lamella layers with porosity around 4%, and the designed coating is mainly composed of a composite structure of amorphous matrix with some nanocrystals, while the SS316 coating is primarily consist of ³-(Fe,Ni) phase and obvious FeCrO phase. The microhardness of the FeCrNbBSi coating is reached to 1017.2HV0.1, and higher than 2 times that of SS316 coating, about 428.7HV0.1. The thermal conductivity of coatings was measured at room temperature with a TC-7000H Standard Laser Flash Analyzer. It is observed that the thermal conductivity of designed coating is nearly 3.8 W/mK less than the commercial SS316 coating, which is about 4.3W/mK. Therefore wire-arc sprayed FeCrNbBSi coating could be an effective and economic approach to thermal insulation protection for the components. Key words: cored wire, microstructure, microhardness, thermal conductivity |