D. A. Stratiichuk

Thermodynamic calculation of the Al-B system at pressures to 8 GPa

Using models of phenomenological thermodynamics with interaction parameters derived from experimental data on phase equilibria at high pressures and high temperatures, the evolution of topology of the aluminum-boron phase diagram has been studied at pressures up to 8 GPa.

Phase formation in the Al-B-C ternary system at high pressures and temperatures

The formation of composites in the Al-B-C system at high p, T parameters using aluminum borides, diamonds, boron and aluminum carbides as the initial components has been studied. It has been shown by transmission and scanning electron microscopies that chemical interaction of diamond with aluminum borides in the Cdiam-AlB2 and Cdiam-AlB12 systems takes place starting at 1500°C and at T ≥1700°C becomes more pronounced. The composite produced at 1900–2100°C has been characterized only by intragranular fracture of diamond, which is indicative of the high-strength of phase boundaries. The Al-B4C system is characterized by the formation of high-strength composites that consist of substitutional solid solutions based on the boron carbide lattice.

Production of molybdenum oxide bronzes under high pressures

The obtaining of oxide bronzes with a nanocomponent based on MxMoO3 at high pressures and temperatures is reported.

The production of nanoparticles of tungsten oxide bronzes at high pressures

Nanorods of tungsten oxide bronze K0.3W0.95O3 have been produced at high pressures and temperatures.

Composite superhard materials containing boron carbide

The possibility is shown to produce composite superhard materials containing boron carbide and having enhanced thermostability as well as high elastic characteristics, hardness, and fracture toughness. The sufficiently high fracture toughness of the composite is due to the structure with an enhanced strength of phase boundaries, which forms at high p, T parameters of sintering.

The Influence of VC–Al Additive on Wear Resistance of cBN-based Composites

The paper addresses wear resistance of cBN–VC–Al cutting tool material under the conditions of high-speed continuous turning of AISI 316L stainless steel.

Thermodynamic calculation of the phase diagram for the Al–B–C system at pressure 7.7 GPa

The phase diagram of the Al–B–C system has been calculated at pressure 7.7 GPa using models of the phenomenological thermodynamics with the interaction parameters derived from the experimental data on the phase equilibria at high pressures and temperatures.

Thermodynamic calculation of the phase diagram of the Si–C system up to 8 GPa

The isobaric sections of the phase diagram of the silicon–carbon system at 8 GPa has been calculated using the phenomenological thermodynamics models with parameters of the interaction that have been defined based on the experimental data on the phase equilibria at high pressures and temperatures.

The crystal structure of aluminum diborides synthesized under high pressures and temperatures

The phase formation in the Al-B system under high pressures and temperatures as well as of crystal structures of aluminum borides forming in the system have been studied. The existence of AlB2, Al16, AlB25, AlxB12 have been detected by X-ray diffraction and scanning electron microscopy. It has been shown that the crystal structures of boron-rich high-pressure synthesized Al16, AlB25, AlxB12 phases are closely related to the crystal structures of known boron modifications.

Producing the MP2O7 (M = Nb, Ta, Re, Mo, W) diphosphates at high pressures and catalytic activity of the Pt(Pd)/MP2O7 systems in the reaction of hydrogen oxidation

The MP2O7 (M = W, Mo, Nb, Ta, Re) diphosphates have been synthesized under thermobaric conditions as initial matrices for the Pt(Pd)/MP2O7 hydrogen-oxygen catalytic systems.