Abstract
Abstract hydroxyapatite (HA) powder has been used widely not only in the bioceramics for hard tissue replacement but also in bioactive coatings of orthopaedic and dental implants. In this communication, we introduce a new hollow spherical HA powder with a thin shell structure (TS-HSHA powder) for the high-performance plasma-sprayed HA coating on the metallic implant. The TS-HSHA powder was prepared by the plasma process with a heat preservation zone around the flight particle. Scanning electron micrographs of the TS-HSHA powder showed that it exhibited a highly spherical morphology and a hollow structure with a shell enclosing a large central cavity. The mean size of the TS-HSHA powder is about 105.75 μm, and the mean shell thickness is only 3.11 μm. Furthermore, not only the formation mechanism of the TS-HSHA powder but also its comparison with the powder obtained by the plasma process without a heat preservation zone were also discussed.
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