Contents

Effect of energy fluxes on materials

S.A. Maslyaev, E.V. Morozov, P.A. Romakhin, V.N. Pimenov, V.A. Gribkov, A.N. Tikhonov,
G.G. Bondarenko, A.V. Dubrovsky, E.E. Kazilin, I.P. Sasinovskaya, O.V. Sinitsyna

Damage of Al2O3 ceramics under the action of pulsed ion and plasma fluxes and laser irradiation............................................ 5

Effects of the power pulsed ion and high-temperature plasma fluxes in Plasma Focus (PF) device as well
as free running mode laser radiation action on alumina ceramics with corundum structure (
a-Al2O3)
produced by means of powder technology have been studied. Flux density q and acting pulse duration
t for plasma, ion, and laser irradiation are qp107 W/cm2 and tp100 ns, qi108 W/cm2 and ti20 ns,
and q
l(3-5)105 W/cm2 and tl0.7 ms respectively. The ceramics resistance to damage under the action
of pulsed energy fluxes was estimated on the weight loss of irradiated specimens and by the surface layers
defect structure observations. It is shown that combined use of PF and laser irradiation allows doing
simulation of the extreme processes of the surface erosion and damage of materials in thermonuclear
fusion reactors (such as ELMs-effects in ITER or at the first wall of the chambers with inertial plasma
confinement).

Keywords: pulsed ion and plasma streams, plasma focus, laser irradiation, material erosion,
material damage, thermonuclear fusion reactor.

 

Plasmochemical methods of production and treatment of materials

N.A. Smolanov

Carbonaceous and titanium contained nano- and microparticles deposition from a low-temperature
discharge arc plasma.................................................................................................................................................................. 18

Morphology as well as elemental composition and size distribution of the particles obtained by electric arc
sputtering of Ti in nitrogen and acetylene environment have been investigated by TEM and size test methods.

Keywords: arc discharge, dusty plasma, drop fraction, elemental composition, granulometry.

 

Functional coatings and surface treatment

I.M. Poletika, M.V. Tetyutskaya, S.A. Makarov

Deposition of wear- and corrosion-resistant coatings on mild steel by the vacuum-free electron-beam
surfacing of boron and chromium carbides................................................................................................................................ 24

Wear- and corrosion-resistant coatings have been deposited on low-carbon steel by electron-beam surfacing
of the powder mixtures of chromium and boron carbides. Composition of surfacing mixture has been selected
in order to achieve an optimal combination of the coating properties. Effect of irradiation conditions on the
structure and properties of surfacing layer is studied.

Keywords: electron-beam surfacing, carbides of chromium and boron, structure, phase composition,
carboboride hardening, wear resistance, corrosion resistance.

 

Yu.A. Pustov, A.S. Zolotarev, N.A. Gladkikh, V.I. Kalita, D.I. Komlev, A.A. Radyuk, A.Yu. Ivannikov

Structure and corrosion-electrochemical behavior of the systems of Fe-based amorphous
plasma coating steel substrate............................................................................................................................................... 35

By means of chronopotentiometry and potentiodynamic voltammetry methods, corrosion-electrochemical
behavior of the systems Fe-based substrate plasma sprayed amorphous coatings (Fe-Cr-Mn-C-Si-B and
Fe-Cr-Mn-C-Si-B-Mo-W) in 3% NaCl water solution has been investigated. It is shown that the corrosion
durability of these systems is determined by the coating resistance to through porosity development conditional
the coating material and thickness. Effect of the porosity on corrosive attack of the systems investigated is
decreased with the coating thickness increase and disappears in full after the coating impregnation with
waterproofing liquid. Mo addition into sprayed composition increases the coating resistance due to increase
of self-passivation susceptibility of the material.

Keywords: plasma-sprayed coatings, corrosion-electrochemical behavior, through porosity
impregnation, waterproofing liquid.

 

Yu.N. Varzarev, A.V. Makharinets, L.P. Mileshko

Kinetics and mechanism of silicon carbide anodic oxidation in ethylene glycol based nitrate electrolyte.................................... 44

Mechanisms of galvanostatic formation of silicon carbide anodic oxide films in ethylene glycol based
water-nitrate electrolyte taking into account the controlled stage of formation of silicon oxide intermediate
compound and its subsequent partial reactions with nitrate and hydroxide anions yielding to silicon dioxide
and silicic acid are proposed.

Keywords: anodic oxide films, anodic oxidation of silicon carbide, silicon carbide anodizing.

 

Composite materials

L.I. Kobeleva, L.K. Bolotova, I.E. Kalashnikov, I.V. Katin, P.A. Bykov

Composite granules of tin-based alloy........................................................................................................................................ 49

The possibility of manufacturing the composite granules by mechanical activation of babbitt and nano-
and micro-sized reinforcing components, including carbonaceous ones, has been considered, and
a mechanical alloying process parameters were determined. The structure of the granules of composite
obtained is investigated.

Keywords: mechanical alloying, composite granules, reinforcing components, babbit.

 

P.N. Petrova, A.A. Okhlopkova, M.D. Sokolova, T.A. Isakova

Effect of combined mechanoactivation and ultrasonic treatment on the properties of composite materials
on the base of polytetrafluoroethylene......................................................................................................................................... 57

Effects of combined mechanoactivation and ultrasound treatment of the fillers on the mechanical properties
and tribotechnical behavior of polytetrafluoroethylene-based polymer composites have been investigated.

The powder mixtures of zeolite+ultrafine polytetrafluoroethylene in different proportions were used as
the fillers. Improvement of the polymer composite properties studied is ascertained as a result of combined
treatment of fillers.

Keywords: polytetrafluoroethylene, zeolite, mechanical activation, ultrasound, polymer filler,
strength, wear resistance.

 

A.M. Vlasova, B.A. Greenberg, A.V. Inozemtzev, S.V. Kuz¢min, V.I. Lysak

Multilayer Mg-Ti based composites produced by explosion welding: risk zones........................................................................ 64

The structure of interface between the Mg alloy and titanium which is a risk zone for the explosion welded
composition as a whole has been investigated. Experiments were carried out for two composites produced
in a soft and hard welding mode. It is ascertained that the soft explosion welding secures the higher
quality of the weld joint. Exploitation properties of composites investigated is found to be deteriorated as
colloid Mg-Ti system is formed. The models for voids formation in Mg under explosion loading are considered.

Keywords: explosion welding, composites, colloidal solution, wave, spike, fragmentation type crushing,
magnesium, titanium.

 

New methods of treatment and production of materials
with required properties

I.I. Chernov, .S. Staltsov, I.A. Bogachev, B.A. Kalin, E.A. Olevsky, L.Yu. Lebedeva, A.A. Nikitina

Optimization of mechanical alloying conditions for production of reactor ODS steel by spark-plasma sintering...................... 72

The structure and uniformity of distribution of dispersed particles of Y2O3 in the ODS ferritic-martensitic
reactor steel EP-450 (0.12C-13Cr-2Mo-Nb-V-B, wt.%) produced by spark-plasma sintering have been
investigated. The absence of strengthening oxide nanoparticles ascertained in the local volumes of sintered
specimens is found to be caused by the formation of the agglomerates of the particles of matrix steel powder
without the oxide nanoparticles in the interior of theirs. To minimize of agglomeration effect as well as to
achieve a uniform distribution of oxide nanoparticles in the material and production of compacts with
minimum porosity, mechanical alloying time should not exceed 30 hours, and spark plasma sintering of
powders should be carried out at the lowest possible temperature.

Keywords: reactor ODS steel, mechanical alloying, spark-plasma sintering.

 

S.N. Grigoriev, A.V. Gusarov, A.A. Okunkova, K.E. Protasov, R.S. Khmyrov

On appropriateness of beam profiling in technologies of selective laser sintering/melting......................................................... 80

Temperature fields and width of the path treated under selective laser sintering/melting with the use of laser
beams with different profiling on energy flux density have been calculated. Simulation was carried out for
a normal distribution (TEM
00 mode), PT-distribution yielding a uniform steady-state temperature for immovable
laser beam, and for a ring distribution (TEM
01* mode) at values of Peclet number from 0 to 3. Under SLS/SLM
in a narrow temperature range
DT=TmaxTmin, the PT-distribution is the best and TEM00 one the worst, but
under the treatment in a wide temperature interval the best profile is TEM
00. Numerical simulation for fused
silica shows that after the change a beam mode from TEM
00 to TEM01* the evaporation losses are decreased
and the treated path width is increased.

Keywords: thermal conductivity, evaporation, Peclet number.

 

O.A. Shkoda

Effect of preliminary mechanical activation on the behavior of Ti-Ni powder system thermal explosion.................................... 88

Effects of the conditions of preliminary mechanical activation on the structure and temperature properties
of self-propagation high-temperature synthesis of Ti-Ni powder mixture thermal explosion have been
investigated. Structures of laminated agglomerates as well as granulometric composition of the powder
mixture were studied. The main regularities of Ti-Ni powder mixture formation under mechanical activation,
which are influencing on the behavior of following thermal explosion, is ascertained.

Keywords: mechanical activation, thermal explosion, powder mixture, synthesis, laminated agglomerate,
titanium, nickel, structure, combustion temperature, adhering.

 

N.I. Radishevskaya, N.G. Kasatsky, O.V. Lvov, A.Yu. Nazarova, V.D. Kitler, O.K. Lepakova

The use of mechanochemical activation during SH-synthesis of cobalt-containing spinel-type pigments................................... 94

Ceramic spinel-type pigments were obtained in the ZnO-O-Al2O3 and ZnO-MgO-O-Al2O3 systems
by self-propagating high-temperature synthesis using mechanical activation of initial components. It was
found that mechanical activation of initial components in a planetary mill M3 type with an acceleration of
45 g for 60 s leads to a reduction in initial temperature of SH-synthesis by 170C. The increase in completeness
of spinel synthesis was confirmed by IR-spectroscopy, X-ray diffraction, X-ray microanalysis, light and
scanning electron microscopy.

Keywords: self-propagating high-temperature synthesis, mechanochemical activation, ceramic pigments,
spinel, aluminum, oxides, oxidation.