In this paper, three goals are attacked, namely synthesis of nanostructured hydroxyapatite (HA) powder, obtaining HA phase constitution close to that of the bone hydroxyapatite, and preserving the initial HA composition and crystal structure in the sprayed coating. HA-aluminum composite coatings are produced using the cold gas dynamic spray method (CGDS). It is observed that the CGDS process enables the application of coatings without changing the phase composition of the HA, whereby the HA biocompatibility is retained. Paper includes a German-language abstract.

This paper aims to clarify the thermal and mechanical properties of zirconium dioxide-cerium(IV) oxide-yttrium oxide and zirconium dioxide-yttrium oxide plasma sprayed coatings. such as phase transformation, bond coat oxidation, and thermal expansion mismatch. Both coatings showed a 7 to 11% porosity fraction and typical lamellar structure, which formed due to continuous wetting by liquid droplets. It is observed that the zirconium dioxide-cerium(IV) oxide-yttrium oxide coating turned out to be better than the zirconium dioxide-yttrium oxide because there was no phase change from the tetragonal to the monoclinic phase (which leads to a spatial expansion), because there was a smaller thermal expansion offset and the effect of the oxide growth stress the better thermal insulation was relatively small. Paper includes a German-language abstract.