Electronic transition spectrum of iridium monoboride in the spectral region between 400 and 545 nm has been recorded and analyzed using laser vaporization/reaction free jet expansion source and laser induced fluorescence spectroscopy. Thirteen vibrational bands belonging to four electronic trans...

First-principles electronic structures were used to compute the lattice and elastic constants of single-crystal TiB and NbB and changes with Nb, Ti, Al and V solutes. The data were built into an interpolation formula for lattice and elastic constants of the quartenary (TiNbAlV)B with dilute Al a...

This work presents the fabrication of high-dense titanium carbide – titanium boride (TiC-TiB2) composites by self-propagating high temperature synthesis (SHS) under-load methodology. The influence of particle size of boron carbide (B4C) and the amount of titanium (Ti) on the TiC-TiB2 composites...

The existence of the equiatomic HfB and ZrB phases with B1 (B27) structure types in binary and ternary alloy systems is heavily disputed in literature. In this work, we use atom probe tomography (APT) to further investigate assumed regions of these phases, as identified by scanning electron micr...

Tantalum is known to be a highly corrosion resistant refractory metal. Boronized tantalum has potential use in machinery components, structures and as a bearing material in joint implants due to its high corrosive resistance and hardness. In this research, the friction and wear characteristics o...

The macrokinetic features of combustion in the Ta-Zr-B system were studied. Combustion is characterized by spin mode, suggesting the limiting role of gas-phase mass transfer of reagents. The mechanism of chemical reactions and phase formation in combustion wave was discussed. Primary layers of t...

Tantalum carbide (TaC) based tandem coatings for selective absorption of solar radiation were fabricated by magnetron sputtering technique. Tandem structure of Ti/TaC/Al2O3 coating was deposited on a stainless steel substrate in which Ti acts as back reflection layer, TaC acts as main absorber l...

Almost full density (>99% theoretical density (ρth)) was achieved for ZrB2-20vol% SiC-Xwt.% Ta (X = 2,5, 5 and 10) composites after Spark Plasma Sintering (SPS) (Temperature: 1900 °C, Pressure: 50 MPa; Time: 3 min). The microstructure of ZrB2-based composites exhibited core-rim structure and i...

This paper describes a model developed to simulate the evolution of carbide layers (TaC/Ta2C) formed during carburizing and annealing treatments of tantalum. The model is based on a parabolic evolution of the layer thickness during the growth, and on the carbon conservation during the annealing....

Ultra-high temperature boride ceramics have proved to show promising properties for novel solar receivers. The present work shows a further step towards their actual application, investigating how sintering technique and starting powders composition affect the properties of final materials. Thus...

On the basis of the evolutionary methodology for crystal structure prediction, we have revealed a novel monoclinic C2/m structure TaB4 with planar six-membered ring boron network along the crystallographic b axis. We name it as m-TaB4. The calculations of elastic constants and phonon dispersion ...

The chemical-physical properties of thin lanthanum (oxy)boride films deposited on polycrystalline tantalum substrates by different deposition techniques (Pulsed Laser Deposition - PLD - with either nanosecond or femtosecond laser source, and electron beam evaporation) were compared in order to i...

TaB- and TaB2–Al2O3 in situ composites were fabricated by thermite-incorporated combustion synthesis from the powder mixtures of different combinations, including Ta2O5–Al–B, Ta2O5–Al–B2O3–B, and Ta2O5–B2O3–Al. Effects of excess boron were studied on the combustion dynamics and phase con...

The new ternary transition metal-rich borides Ta2OsB2 and TaRuB have been successfully synthesized by arc-melting the elements in a water-cooled crucible under an argon atmosphere. The crystal structures of both compounds were solved by single-crystal X-ray diffraction and their metal compositio...

The microstructure of dissimilar transient liquid phase bond between Hastelloy X and IN792 nickel-based superalloys is featured by lack of sufficient formation of γ′ precipitates in the bond-centerline and extensive in-situ precipitation of boride second phases in the diffusion affected zones ...

Mesoporous nanomaterials not only possess strong ability to adsorb and interact with guest species both on their outer and inner surfaces, but also exhibit nanoscale effects in their channels and on the walls of their pores. This opens up intriguing possibilities for the design of highly activit...

The roles of nucleation temperature and heat transfer of constituents used in the synthesis processes of transition metal boride (TMB) nanoparticles by radio frequency (RF) thermal plasma were investigated through the comparison between titanium and iron boride nanoparticles prepared in differen...

Multiphase sintering of an iron, copper and boron powder mixture of a concentration of 5–15 wt.% of copper and 9 wt.% of boron has been analysed. It was found that an addition of copper to a powder mixture allows full control of the quantity of liquid phase during the sintering by the mass conc...

The heat capacity Cv(T) and unit cell volume V(T) temperature dependencies of lutetium borides LuB2 and LuB4 in the region of 2–300 К were analysed in the Debye-Einstein approximation. The characteristic temperatures of the Debye and Einstein components of boride heat capacity and thermal expa...

Boriding and deposition of iron borides on Armco iron and the steels Ck45 and 42CrMo4 have been investigated at temperatures below 833 K using BCl3–H2–Ar gas mixtures activated by pulsed d.c. glow discharges. For the layer deposition FeCl3 and Fe(CO)5 were used as precursors. A boriding depth ...