Effect of energy fluxes on materials
A.V. Pyataev, A.A. Ignatyev,
Yu.M. Vyzhimov, R.I. Batalov,
R.M. Bayazitov, V.A. Shustov
It is found that after exposure to the nanosecond intense ion beam, a change in the direction of the
spontaneous magnetic moment in a thin ribbon of Fe77Cu1Nb3Si13B6 amorphous alloy was occurred.
The average direction of the magnetic moment rotates from the easy plane to normal to the plane of the
ribbon. The angle between the average direction of spontaneous magnetic moment and ribbon plane
varies depending on the fluence of ion beam irradiation.
Functional coatings and surface treatment
G.A. Pribytkov, V.V. Korzhova
By metallography, X-ray diffraction, and X-ray microanalysis methods, the structure transformations
in the surface layer of the powder Al-Cr-Si cathode under the action of a stationary vacuum arc on the
surface of the cathode have been investigated. It is ascertained that arc-induced heating leads to melting
of the cathode surface layer to a depth of 30-80 μm. The surface layer depletion with Al and Si is to be
found due to its selective evaporation from the bath of molten metal.
A.Kh. Valeeva, I.Sh. Valeev
Effect of surfactant additive, current density and antimony chloride concentration on the chemical
composition and microstructure of the electrodeposited alloy Sn-Sb-Cu has been investigated.
It was shown that the presence of surfactant in the electrolyte allows to obtain a fine-grained alloy
structure with composition like a tin babbit. Depending on concentration of SbCl3 in the electrolyte,
coatings with different microstructures were obtained. Their structures were the solid solution of tin
with precipitations of Cu6Sn5 and Sn3Sb2 phases or the mixture of Cu2Sb and Cu3Sn intermetallides.
From the electrolyte with the surfactant and SbCl3 concentration of 0.0125 M at current density
0.31 mA/dm2, the fine-grained structure of the alloy Sn-Sb-Cu was formed with the phase and chemical
composition similar to that of a tin babbit.
Plasmochemical methods of production and treatment of materials
V.I. Kalita, A.I. Mamaev, V.A. Mamaeva, D.A. Malanin, D.I. Komlev,
A.G. Gnedovets, V.V. Novochadov, V.S. Komlev, A.A. Radyuk
Structure and shear strength of implants with plasma coatings ................................................................................................. 30
Four types of the three-dimensional plasma capillary-porous titanium coatings for model intraosseous
implants were developed. By means of pulsed microplasma oxidation in solutions or plasma spraying
of powders, the additional bioactive coatings on the base of calcium phosphates have been deposited
on the Ti coating surface. Shear strength values of the interface between the implants coated and osseous
block after 16 weeks of implantation are 4,25-4,81 MPa while for implants with additional plasma
hydroxyapatite coating it exceeds 6.19 MPa after 4 weeks of implantation.
V.M. Gusev, O.Yu. Elagina, V.B. Mordynsky, A.S. Tyuftyaev
An investigation of thermal conductivity of the ceramic plasma coatings sprayed with plated powders .................................... 47
The features of the formation and structure of plasma ceramic coatings sprayed from composite powders of
alumina and zirconia plated with nickel and aluminum. Porosity and thermal conductivity of the coatings, as
well as microhardness of the phase components were measured. It was found that the decrease in thermal
conductivity of the coatings due to reducing the content of the metal phase when the plasmatron arc power
was increased is compensated by its increase owing to coating porosity decreasing. It eliminates the net effect
of the arc power on thermal conductivity of ceramic-metal coatings.
A.M. Efremov, A.V. Dunaev, D.B. Murin
Effect of the initial composition of gaseous binary mixtures of HCl with Ar, H2 and Cl2 on the kinetics
of GaAs plasma etching under the conditions of DC glow discharge has been investigated. Kinetics of
the etching is found to be controlled by change of the flux density of Cl atoms, and probability of GaAs
interaction with chlorine atoms is dependent on the treated surface temperature and flux density of ions.
Correlation between GaAs etching rate and mean-square surface roughness of treated surface is ascertained.
New methods of treatment and production
with required properties
V.V. Roshchupkin, M.A. Pokrasin, M.M. Lyakhovitsky, N.A. Minina
Acoustic and acoustic-emission methods of investigation of physical and mechanical properties of materials.......................... 62
An improved method and experimental setup for the study of the acoustic properties (speed and
attenuation coefficient of ultrasonic) in metals and alloys are described. The use of additional data
obtained by dilatometric measurements allows to improve the accuracy of determined acoustic properties
and to calculate the temperature dependencies of the density and Young modulus. Developed hardware
and software for measurements and analysis of acoustic emission data allows to detect an accurate
temperature interval of phase transformations in metals.
M.I. Alymov, E.V. Evstratov, A.B. Ankudinov, V.A. Zelensky, O.A. Golosova, A.Yu. Kolobova
A method for production of titanium material with a porous surface layer by hydrostatic pressing and
subsequent hightemperature sintering with the using a sugar as a pore-forming agent for a temporary filling
the pores has been proposed. Comparative studies of the structure and properties of titanium materials
produced by a new way and a classic method of powder metallurgy (uniaxial compression + high-temperature
sintering) were carried out. It is shown that the proposed method allows to obtain the porous titanium
samples with the given parameters of the pore space (the volume fraction and pore size) and high mechanical
properties. By means of the proposed method, experimental model of the element of endoprosthesis
(cup for the acetabulum) was fabricated.
G.A. Dorogina, V.F. Balakirev, E.V. Ignateva, A.V. Dolmatov, O.M. Fedorova, A.B. Shubin
Physical properties of soft magnetic materials sintered from Fe-Si powders crushed in air or alcohol environment................ 76
Comparative investigations of the magnetic and mechanical properties of soft magnetic Fe-Si alloys
sintered from the powder mixtures crushed in air or alcohol environment. Material produced from the
powders crushed in air is found to have better properties. Fe-7% alloy structure analysis shows that
the process of mechanical activation is reduced under the crushing in alcohol due to silicon carbide
formation and decrease of Si concentration in Fe-based solid solution.
O.P. Fedorov, V.F. Demchenko, I.V. Shuba, À.B. Lesnoy
A mathematical simulation of the hydrodynamic and thermal processes during crystal growing by the
Bridgman and floating zone techniques under terrestrial and in microgravity conditions has been carried
out. Features of the hydrodynamic state of the melt under the action of an axial vibration with different
frequency and intensity were studded. It is shown that the floating zone method is less sensitive to
Rayleigh-Taylor instability of liquid phase flow.