Studies on the thermal stability of nanosized powder of WC1-x-based product prepared by plasma dynamic method, compaction feasibility of the powder and preparation of composite with aluminium

Large‐Scale Synthesis and Applications of Hafnium–Tantalum Carbides

“…[24] The presence of excess carbon seems critical for obtaining a product containing nonstoichiometric carbides of heavy transition metals because it requires formation of structures from the shell carbide particles. [25] The results of the detailed The critical condition for the synthesis of nonstoichiometric Hf x Ta y C z compounds is a high rate of crystallization, which has been previously confirmed by Shanenkov et al [26] for nonstoichiometric metastable carbide WC 1-x . We chose a copper substrate for the synthesis of coatings of the predicted HfTaC compounds because copper has a high thermal conductivity of 395 W m −1 K −1 .…”

“…The presence of excess carbon seems critical for obtaining a product containing nonstoichiometric carbides of heavy transition metals because it requires formation of structures from the shell carbide particles. [ 25 ] The results of the detailed high‐resolution TEM study of the obtained carbide particles are shown in Figure S7 (Supporting Information). All particles show high crystallinity with a clearly observed cubic structure.…”

Nanoparticle Size Effects on Phase Stability for Molybdenum and Tungsten Carbides

“…The γ-WC and α-W 2 C phases have higher free energies, indicating that these phases are less stable at large particle sizes. While we do not consider carbon vacancies here, vacancies in the γ-WC phase − and, less commonly, the δ-WC phase , have been reported.…”

“…The γ-WC phase dominates small particle sizes (0–6 nm), ,,− in agreement with our calculations. However, larger γ-WC particles have also been synthesized. ,,− The kinetic barrier for γ-WC to change phases may be higher than the barrier for crystal growth, enabling the phase to grow to sizes where the model no longer predicts it to be the preferred phase. Thus, while it is demonstrably the easiest phase to synthesize at 0–6 nm, the several reports at larger sizes suggest that synthesis specific factors play an important role in representative γ-WC synthesis routes (vide infra).…”

About graphite evaporation dynamics caused by radiation in near zone of magnetoplasma compressor discharge

“…The phenomenon of light erosion is realized in a wide range of devices and technical applications. For example, light erosion (ablation) can occur when the surface of materials is treated with plasma [1], [2] and radiation [3], [4] flows, during the formation and modification of nano-structured relief on the surfaces of various construction materials [5], in ablative pulsed plasma thrusters and electric propulsion systems [6], in plasma dynamic sources of UV/VUV/EUV radiation [7], [8], etc. Of great interest is the impact of powerful radiation on the matter when a photons energy higher than the ionization potential of the samples atoms (i.e.…”