The paper presents study of a new approach to manufacturing carrier implants with a combination of bioactivity, biocompatibility, and mechanical properties, composite powders of hydroxyapatite and titanium with a mass content of 50:50 % when sprayed by gas detonation spraying. Experimental studies of the surface morphology and cross-section microstructure, phase composition and mechanical properties of HATi composite coatings are obtained. The experimental results showed that the cross-section microstructures of HATi composite coatings are typical plate structures comprising curved strips formed by well-deformed and oxidized Ti plates and limited deformed HA plates. Composite coatings’ morphology and phase states were studied using scanning electron microscopy and X-ray diffractometry. It was found that the deprived coatings mainly consist of the phases HA, Ti and TiO. The elemental composition study results designated that the atomic ratio of calcium and phosphorus in the obtained coatings is Ca/P ~ 1.64, which is close to the value of the initial powder — Ca/P ~ 1.67. This indicates a limited change in the chemical composition during the coating formation.

In this work, the influence of the technological parameters of the detonation method on the formation of metal oxide compounds on the basis of titanium was investigated. The aim of the work was to investigate the method of the effective control of the phase composition and microstructure of titanium-based coatings during detonation spraying. The main parameters that varied in detonation spraying were the volume of filling the detonation barrel with explosive mixture and the oxygen/fuel ratio. The mechanism of formation of the gradient structure of coatings based on metal oxide compounds depending on the technological parameters of detonation spraying was considered. The structural-phase states and tribological properties of detonation coatings were investigated by the following methods: X-ray phase analysis (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX-mapping), profilometry, and the test for wear-resistance according to the “ball-disk” scheme. It is shown that the phase composition of coatings may significantly change relative to the initial titanium powder during the detonation spraying due to the interaction of particles of powders with components of the gas atmosphere. Varying the spraying parameters may control the chemical reaction and provide conditions for the synthesis of the desired phases in the coatings (titanium oxide TiO2 and Ti2O3).