Abstract
Hydroxyapatite coatings were sprayed with an arc plasma torch argon-nitrogen plasma at a power of 25 kW from a powder with a particle size of 25 – 63 μm at a distance of 95 mm. The samples to which the coatings were applied were preheated in a resistance furnace in an air atmosphere to temperatures in the range of 20 to 600 °C before being sprayed. The adhesion of the plasma coating from hydroxyapatite to the titanium substrate was determined on the pin specimens. The maximum average adhesion value was recorded when the titanium substrate was preheated to a temperature of 550 °C. The results of the study were discussed on the basis of the mechanism for increasing the activity of the titanium substrate during its preheating in order to increase the adhesion of the coating HA and the formation of an equilibrium phase state in the HA coating required for the prolonged use of implants. The received results will be used for formation of optimum structure of the bioactive covering consisting from three-dimensional capillary-porous titanium coatings (3D CP Ti) coating in the form of crests and hollows with porosity of 50% and HA coating applied on its free surface at a temperature of 550 °C. Such process of spraying to provide dense strong and stable a HA coating on implants.
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