空心球羟基磷灰石等离子喷涂粉体的制备

doi:10.11896/cldb.20020114

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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.

Key words： hollow spherical powder hydroxyapatite plasma spray plasma spheroidization and hollowing process coating

Published: 28 January 2021

CLC number:

TQ174

Fund:The National Natural Science Foundation of China (U1837201).

About author:: Zhi Zhangreceived his M.S. degree in materials from Academy of Aerospace Solid Propulsion Technology (AASPT). He is currently pursuing his Ph.D. degree at School of Metallurgical Engineering, Xi’an University of Architecture and Technology under the supervision of Prof. Youping Ma. His research interests are powder metallurgy material and surface modification technology.
Youping Mareceived his Ph.D. degree in materials from Xi’an Jiaotong University. He is currently a professor in Xi’an University of Architecture and Techno-logy. His research has focused on new wear resistant material and surface modification technology.

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	张智
	马幼平
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	赵丽娜

Cite this article:

张智,马幼平,周子凌, et al. Preparation of Hollow Spherical Hydroxyapatite Powder for Plasma Spray[J]. Materials Reports, 2021, 35(2): 2019-2025.

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http://www.mater-rep.com/EN/10.11896/cldb.20020114 OR http://www.mater-rep.com/EN/Y2021/V35/I2/2019

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