This paper examines the effect of the chemical and phase compositions of nonstoichiometric titanium carbide prepared by self-propagating high-temperature synthesis on the electrical and thermophysical properties of polymer compounds. Doping of titanium carbide with trace amounts of nitrogen raises the conductivity of the polymer compounds. The addition of epoxy to the polymer matrix markedly reduces the thermal expansion of the material. The proposed materials can be used at temperatures of up to 300–350°C.

The electrochemical behavior of coarse-grained and nanostructured titanium in various media is studied by the methods of potentiodynamic polarization and impedance spectroscopy and by the analysis of the etching curves. It is found that the dissolution rate of nanostructured titanium increases in a Ringer-Locke solution at 37°C in comparison with the coarse-grained state owing to a more defective structure of the natural oxide layer on the surface of nanostructured titanium and its lower polarization resistance. It is demonstrated that the etching of nanostructured titanium in a mixture of hydrofluoric and sulfuric acids occurs mostly via the mechanism of local destruction, whereas overall uniform etching occurs in the case of coarse-grained titanium, which is considerably displayed in a range from 40 to 75°C.

This work shows the possibility of obtaining Al2O3–ZrO2–Y2O3medical ceramics from powders synthesized by nanospray drying. The powder is spheres with a uniform distribution of components: mixed...

The composite powders of aluminium and zirconium oxides containing 10, 50 and 90 mol % Al 3+ without a stabilizer have been obtained from suspensions using a spray drying method. The powders obtained at equal mole ratios of zirconium and aluminum in the original solution (0.5:0.5 mol/l) have the largest contents of cubic and tetragonal phases of ZrO2, strictly uniform distribution of phases and the largest value of the specific surface area. The particles with two different morphologies have been obtained: crystalline particles of oxides uniformly distributed in a particle and particles in membrane consisting of zirconium oxide or mixed oxides. It has been experimentally shown that zirconium oxide stabilizes the amorphous phase of aluminum oxide, and aluminum oxide increases the temperature of crystallization of zirconium oxide.