4 research outputs found
Properties of Coatings Deposited from Filtered Vacuum Arc Plasma with HEA Cathode
Ti-V-Zr-Nb-Hf metallic and nitride films were deposited by filtered vacuum arc plasma from a single
equiatomic HEA cathode. The composition, microstructure, mechanical properties, thermal stability and
corrosion properties were investigated.
The deposited metallic film has a two-phase structure with bcc and hcp-lattice. The nitride films were
found to have only an fcc structure. All coatings have nano-grained structures, with grain sizes 5 nm for
metallic and 36 nm for nitride. The nitride coatings have a compressive stress of around – 12,5 GPa, high
hardness ~ 40 GPa and elastic modulus ~ 450 GPa. After annealing in vacuum in range 400-1200 °C, 3 h
for every temperature, hardness decreased to 25 GPa. It was found that both the metallic and nitride coatings
exhibited their best corrosion resistance than steel samples in a 3,5 wt. % NaCl solution. The metallic
coatings showed better corrosion resistance than the nitride coatings.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3532
Effects of Deuterium Implantation Dose on Hardness and Deuterium Desorption Temperature Range from High Entropy TiVZrNbHf and TiVZrNbHfN Coatings
High entropy TiVZrNbHf and TiVZrNbHfN coatings prepared by filtered vacuum arc plasma from a single
equiatomic HEA cathode. Similarly were obtained titanium and titanium nitride coatings. The structure
of coatings was investigated by X-ray analysis and the changes in nanohardness by nanoindentation method.
The effusion of the implanted deuterium was studied by thermal desorption spectroscopy (TDS).
It is shown that the structure of effusion spectrum is a function of deuterium dose. With increasing implantation
dose deuterium desorption temperature range from coatings is expanding in the direction of
lowering the temperature and the temperature of the peak maximum gas emission gradually shifts to lower
temperatures. For nitride coatings deuterium desorption starts at about room temperature and the maximum
rate of desorption at a temperature of ~500 K.
When irradiation doses more than 5×1017 D/cm2 hardness of nitride coatings decreased by half. Hardness
reduction of coatings is caused by occurrence hydride structural formations in coatings.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3536