Applied Mechanics and Materials Vol. 756

Abstract: A technique is developed for fabrication of a shell from glass-metal composite based on the borate glass and aluminum alloy. The metal–glass interface was studied by the optical and atomic force microscopy, it was found the presence of a diffuse layer with thickness of about 1 micron. The diffuse layer composition was studied by the XPS.

Abstract: The data of the study of the elemental and phase composition, the condition of the defect substructure, mechanical and tribological characteristics of titanium alloy VT6 subjected to electroexplosive carburization with a sample of titanium diboride powder and the subsequent treatment by high-intensity pulsed electron beam is presented. It has been established that the main mechanisms responsible for an increase in the mechanical and tribological properties of the material are solid, dispersion, and grain boundary.

Abstract: A surface alloy of the yttrium/titanium system, enriched with oxygen atoms, has been developed using high-energy methods. Formation of a multilayer multiphase submicron-and nanoscale structure has been revealed. A substantial increase in the microhardness (by ≈3 times), a decrease in the friction coefficient (more than by 2 times) and the wear rate (by ≈3 times) of the doped layer have been revealed.

Abstract: The present study provides chemical, granulometric and mineral compounds of raw materials of ceramic charge. The ceramic materials structure made of slimy part of iron ore wastes with corrective additions has been observed by the SEM, petrographic methods and spectral analysis. The introduction of corrective additions leads to formation of crock with evident glass ceramic structure describable by porous texture. Pore space is completely or partially filled with cryptocrystalline substance. It has been determined vanadium component intensifies sintering processes during the firing and leads to formation of new mineral phases. This increases the strength of ceramics.

Abstract: Thermoplastic slip from commercial powders of yttrium nitride and yttrium oxide. The scheme of making the slip is proposed, the casting properties are determined. The influence of sintering additives dispersion and molding conditions (pressure, temperature) on slip properties is researched.

Abstract: The technology of metallurgical machinery components facing with heatproof, hard steels and low temperature pre-heating is developed, and enables producing faced metal without cracks but in condition similar to the quenched one.

Abstract: The paper describes a plasma source based on a self-sustained volume discharge for diamond and diamond-like film deposition. The suggested scheme of the electrode system enables to provide stable combustion of the self-sustained volume discharge with high pulse repetition rate in atmospheric pressure gases. Gas flow rate to blow off the interelectrode gap depending on the anode temperature has been considered.

Abstract: Today an application of metal nanoparticles as additives to base oils is widely studied in tribological centers in many countries. The additives containing nanoparticles essentially raise the wear resistance ability of lubricants and reduce the friction coefficient. However, such lubricants are still not widely used. This paper gives a brief analysis of the problem.

Abstract: This work presents the characteristic properties of powdered materials sintering under conditions of liquid-phase sintering. It has been established that to implement the liquid-phase sintering advantages it is necessary to do temperature research when the liquid-phase concentration does not exceed the critical one. The implementation of this condition provides the sintering temperature reduction by 150 – 200 °С.

Abstract: The paper presents comparative studies of physical-mechanical properties of long-measured/elongated corundum-zirconium ceramic with different phase ration, manufactured with the use of the radial magnetoimpulse press. The optimal mode of pressing of ultra-dispersed powders was developed, where the amplitude of magnetoimpulse pressure is 1.14 GPа at acceleration time-120 mcs. We obtained the corundum-zirconium ceramic with the grain size 0.35-0.5 μm and the coherent-scattering regions of 0.050-0.120 μm, possessing microhardness 10.6-12.9 GPа and crack-resistance 5.5-7.8 MPа·m^1/2.