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Nano-particle hydroxyapatite (HA) was prepared with a novel ultrasonic precipitation process and the as-prepared nanopowder was used to produce hydroxyapatite (HA) coatings on titanium substrate via plasma spraying. The phase and the microstructure of the coating were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results showed that spherical particles could be prepared by ultrasonic precipitation process; and a corresponding dense HA coating with molten surface and low-porosity cross-section structure was acquired. During the plasma spraying process, new phases of Ca_3(PO_4)_2 and Ca_2P_2O_7 were generated. After heat-treating at 800 ℃ for 1 h, the contents of Ca_3(PO_4)_2 and Ca_2P_2O_7 decreased while HA content increased. Tensile adhesion tests showed that the plasma sprayed coating prepared with the spherical nanoparticles exhibited high tensile bond strength.
Nano-particle hydroxyapatite (HA) was prepared with a novel ultrasonic precipitation process and the as-prepared nanopowder was used to produce hydroxyapatite (HA) coatings on titanium substrate via plasma spraying. The phase and the microstructure of the coating were characterized by X- ray diffraction (XRD) and scanning electron microscopy (SEM). Results of spherical particles could be prepared by ultrasonic precipitation process; and a corresponding dense HA coating with molten surface and low-porosity cross-section structure. After heat-treating at 800 ℃ for 1 h, the contents of Ca_3 (PO_4) _2 and Ca_2P_2O_7 decreased while HA content increased. Tensile adhesion tests showed that the plasma sprayed coating prepared with the spherical nanoparticles exhibited high tensile bond strength.