Microstructure and bioactivity in SBF of the hydroxyapatite coatings plasma sprayed with a magnetic field |
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| Affiliation: | 1. School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China;2. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China;3. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People’s Republic of China;4. Key Laboratory for Advanced Materials Processing Technology (Ministry of Education), Beijing 100084, People’s Republic of China;1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China;2. Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China;1. School of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui 243002, China;2. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, USA;3. School of Materials Science and Engineering, Anhui University of Technology, Maanshan, Anhui 243002, China;4. China Aerospace Science and Technology Corporation, Beijing 100048, China;1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China;2. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150080, China;3. School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, China |
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| Abstract: | A 100 mT magnetic field was introduced during the plasma spraying of hydroxyapatite (HA) coating on Ti6Al4V substrate. The influence of the magnetic field on the microstructure, bonding strength, and bioactivity of the coating was investigated. Compared with as-sprayed coating, the coating sprayed under a magnetic field showed fewer porosity and microcracks and a significantly decreased absolute value of the residual stress. The bonding strength of the coating sprayed under a magnetic field was approximately 173.6 % greater than as-sprayed coating. With increasing time in simulated body fluid, the width of microcracks on the surface of both coatings first increased and then decreased. The widths of microcracks on the coating sprayed under a magnetic field were much smaller than as-sprayed coating. During spraying process, the magnetic field would enhance the wetting and flowing ability of the HA molten droplets, prolonging their cooling, which affects the microstructure and bioactivity of the coating. |
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| Keywords: | Plasma spray Hydroxyapatite coating Magnetic field Bioactivity |
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