Preparation of Hollow Spherical Hydroxyapatite Powder for Plasma Spray
ZHANG Zhi1,2, MA Youping1, WANG Fuqiang2, ZHOU Ziling3, WEI Huali2, ZHAO Li’na4
1 School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 2 Xi'an Aerospace Composites Research Institute, Xi'an 710025, China; 3 Hokkaido University, Hokkaido 079-1143, Japan; 4 State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
Abstract: Hydroxyapatite powder for plasma spray has been used widely in the plasma-sprayed bioactive coatings of orthopaedic and dental implants. It’s important to develop the high-quality hydroxyapatite powder for plasma spray in order to improve the performance of the plasma-sprayed bioactive hydroxyapatite coatings. In this study, a new hollow spherical hydroxyapatite powder was prepared by hydrothermal treatment, spray drying, plasma spheroidization and hollowing process. Scanning electron micrographs of the hollow spherical hydroxyapatite powder showed that it exhibited a spherical morphology and a hollow structure with a shell enclosing a central cavity. The mean size of the hollow spherical hydroxyapatite powder is about 80.4 μm, and the mean shell thickness is about 13.3 μm. Furthermore, the hollowing process of the agglomerated hydroxyapatite powder in plasma flame was studied. Results showed that the initial porosity of the agglomerated hydroxyapatite powder and powder melting degree in plasma flame, and the air tightness of the droplet were main factors determining the hollowing effect. Furthermore, the coa-tings obtained using the agglomerated hydroxyapatite powder and hollow spherical hydroxyapatite powder as feedstock were prepared by a plasma spraying method. Results showed that the coating prepared from the hollow hydroxyapatite powder was denser and had higher bond strength than the coating prepared from the agglomerated hydroxyapatite powder.
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