Microstructure and thermal conductivity of Fe-based amorphous coatings prepared by HVOF thermal spraying

L. Wang, Z. Zhou, H. H. Yao, Y. M. Wang, X. Wu, D. Y. He

科研成果: 书/报告/会议事项章节会议稿件同行评审

摘要

Gas-atomized Fe59Cr12Nb5B20Si4 amorphous powders were deposited to form amorphous coatings on the ASTM 4032 aluminum alloy substrate by HVOF thermal spraying under different conditions. The microstructural studies show that the coatings exhibit dense layered structure and relatively low porosity, less than 1.3 %. The coatings primarily consist of amorphous matrix with some precipitated nanocrystals, and the amorphous fractions of all the coatings are more than 40% by calculation from DSC results. Depending on the structure advantage, the coatings exhibit high microhardness, from 1230 HV to 1285 HV. Meanwhile, the bonding strength of as-deposited coatings increases with the rising flow of oxygen and kerosene, reached to 53.3 MPa. The ability of heat transport of asdeposited Fe-based coatings were investigated by calculation thermal conductivities from k= apCp. The results show that the thermal conductivity ascends slightly with the enlargement of spraying parameter in examined range, from 1.99 to 3.1 W/mK. However, thermal conductivities of all designed coatings are lower than metal-based materials. Furthermore, it is also notable that the microstructural characteristic and performance of the Fe-based coatings under different spraying conditions are similar, which manifests the Fe59Cr12Nb5B20Si4 powder has a great broad adaptability for HVOF thermal spraying process. It is very important for practical engineering applications.

源语言英语
主期刊名International Thermal Spray Conference and Exposition, ITSC 2016
出版商ASM International
173-178
页数6
ISBN(电子版)9781510844001
出版状态已出版 - 2016
活动International Thermal Spray Conference and Exposition, ITSC 2016 - Shanghai, 中国
期限: 10 5月 201612 5月 2016

出版系列

姓名Proceedings of the International Thermal Spray Conference
1

会议

会议International Thermal Spray Conference and Exposition, ITSC 2016
国家/地区中国
Shanghai
时期10/05/1612/05/16

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