Thermally activated relaxation processes in superhard nc-TiN/a-SiN and nc-(TiAl)N/a-SiN nanocomposites studied by means of internal friction measurements

Electronic structure, stability, and mechanism of the decohesion and shear of interfaces in superhard nanocomposites and heterostructures

“…3, 12, and 20͒ or by reactive sputtering in pure nitrogen at 600°C. 21 [1][2][3]18,20,22 We emphasize that fcc͑NaCl͒-like-SiN may exist only as pseudomorphically stabilized 1-3 ML thick interfacial layers in the heterostructures. It collapses and becomes amorphous at a greater thickness.…”

“…These must have randomly oriented TiN nanocrystals, fully segregated, stable Si 3 N 4 -like interfaces and show perfect stability up to Ն1100°C without any internal friction signal. 3,18 Because the coatings reported in Ref. 17 were deposited at much lower temperature ͑see Refs.…”

Industrial applications of superhard nanocomposite coatings

“…Ongoing investigations into the improvement of the properties of the coatings revealed that there was no measurable change of the elemental or phase composition measured by X-ray photoelectron spectroscopy (XPS), of the hardness (measured by automated loaddepth-sensing indentation) or morphology (investigated by SEM). The only noticeable improvement has been seen in the measurement of the internal friction [66], which revealed a small decrease of the internal friction peak for the coating deposited by the improved coating technology [65]. The decrease of the internal friction peak is a sign of an improvement of the stability of the grain boundaries by a better phase segregation [66] and possibly lower impurities content [67].…”

“…The only noticeable improvement has been seen in the measurement of the internal friction [66], which revealed a small decrease of the internal friction peak for the coating deposited by the improved coating technology [65]. The decrease of the internal friction peak is a sign of an improvement of the stability of the grain boundaries by a better phase segregation [66] and possibly lower impurities content [67].…”

Structure and properties of small clusters of transition 3d-element nitrides

“…Возрос интерес к нано-композитным пленкам, полученным на основе нитридов переходных металлов. Как правило, наноструктурные пленки образуются путем осаждения газометаллических плазменных потоков при определенных концентрациях реагентов в оптимально выбранных условиях как фор-мирования так и осаждения потока кластерных частиц [2,3]. Формирование кластеров в виде пучков удобно как при генерации, так и для их применения [4].…”