The structure, mechanical properties and impact strength of 5-layered composites based on maraging and low-alloy mild steels are investigated. The effect of subsequent heat treatment on the microstructure and mechanical properties of layered composites is studied. The contribution of the presence of the initial ultrafine-grained microstructure of maraging steel to the formation of the mechanical properties of explosion-welded and thermally strengthened layered composites is evaluated. Kolesnikov A.G., Plokhikh A.I. A study of special features of formation of submicro-and nanosize structure in multilayer materials by the method of hot rolling. Metal Science and Heat Treatment, 2010, vol. 52, iss. 5-6, pp. 44-49 (tekhnologiya, oborudovanie, instrumenty, 2014, no. 3 (64), pp. 28-36. (In Russian).

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Doped with K + , Mg 2+ , Fe 2+ , Zn 2+ , Mn 2+ , Li + , Au 3+ , SiO 2 nanocrystalline calcium carbonate-phosphate extends significantly the functionality for drug delivery: it can be used to speed up the processes of bone repair and bone tissue strengthening. The advantage over other calcium phosphate biomaterials is strengthening of bone and tooth tissues of a human being of any age, the substances being transported through skin to restore broken bones in a critically short period of time regardless of age. The mechanical fracture strength of bone tissue increases almost in 5 times. These studies suggest doped calcium carbonate-phosphate is the most appropriate material, because reduce of the cholesterol rate in the blood in 2-2.5 time. The best results have been observed with concentrations of 5-10% doped calcium carbonatephosphate in the implant used the polycaprolactone. Young`s modulus is maximal for specimens with 5% doped calcium carbonate-phosphate.

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