Self-propagating high-temperature synthesis of target cathodes in the system Ti-Ta-C-Ca3(PO4)2 for the ion-plasma deposition of multifunctional tissue-compatible nanostructured coatings

Abstract

We present the results of investigations of synthesis in a burning mode of tissue-compatible compact composition materials of tantalum-containing target cathodes (Ti, Ta)Cx + Ca3(PO4)2 obtained by forced SHS compaction from a Ti + Ta + C + Ca3(PO4)2 mixture and assigned to the ion-plasma deposition of nanostructured tissue-compatible coatings. The effect of the amount of additives of the tantalum-carbon mixture with respect to the weight of the starting charge is investigated. Regularities of phase formation and structural formation in synthetic products are analyzed. A new and important feature is that there is no dependence of the burning velocity and temperature on the relative fraction of the Ta + C mixture. In the temperature profiles, two characteristic peaks of heat release were detected. These peaks indicate that parallel and sequential chemical reactions of the formation of titanium and tantalum carbides proceed. The growth of the relative fraction of the Ta + C mixture led to modification of the carbide structure, to an increase in the residual porosity, and to a considerable increase in hardness.