Mechanical-thermal diffusion processes in the surface layer of a plate in application of a eutectic coating

1988 ◽  
Vol 24 (2) ◽  
pp. 114-119
Author(s):  
A. R. Gachkevich ◽  
V. M. Golubets ◽  
B. I. Gornyi ◽  
O. N. Makarenko
Keyword(s):  
Surface Layer ◽  
Thermal Diffusion ◽  
Diffusion Processes ◽  
Eutectic Coating

Dissipation of mechanical energy in a deformable solid during thermal-diffusion processes

1973 ◽  
Vol 5 (1) ◽  
pp. 1-6
Author(s):  
Ya. S. Podstrigach ◽  
R. N. Shvets ◽  
V. S. Pavlina ◽  
Ya. I. Dasyuk
Keyword(s):  
Thermal Diffusion ◽  
Diffusion Processes ◽  
Mechanical Energy ◽  
Deformable Solid

Two-Branch Boron Diffusion from Gas Phase in n-Type 4H-SiC

2009 ◽  
Vol 615-617 ◽  
pp. 453-456 ◽  
Author(s):  
A.V. Bolotnikov ◽  
Peter G. Muzykov ◽  
Anant K. Agarwal ◽  
Qing Chun Jon Zhang ◽  
Tangali S. Sudarshan
Keyword(s):  
Activation Energy ◽  
Surface Layer ◽  
Gas Phase ◽  
Thermal Diffusion ◽  
Vapor Phase ◽  
Arrhenius Plot ◽  
Deep Level ◽  
Diffusion Profile ◽  
Boron Diffusion

In this work the analysis of thermal diffusion of boron carried out from vapor phase was performed. Two-branch diffusion associated with kick-out and substitution mechanisms was observed. The activation energy and prefactor were calculated from Arrhenius plot for each diffusion branch. It has been established that the surface layer of diffused boron mostly consists of shallow boron acceptors, while the tail of the diffusion profile has mostly deep level D centers.

Nitrogen Effect on Mechanical and Tribological Properties of STN 41 5230 Steel Surface Layer

2014 ◽  
Vol 1059 ◽  
pp. 11-17
Author(s):  
Ivan Kováč ◽  
Rastislav Mikuš ◽  
Jozef Žarnovský ◽  
Juraj Ružbarský
Keyword(s):  
Surface Layer ◽  
Diffusion Processes ◽  
Base Material ◽  
Material Surface ◽  
Surface Layers ◽  
Mechanical And Tribological Properties ◽  
Nitrogen Effect ◽  
A Tig Welding ◽  
The Subject ◽  
Hardness Values

The subject-matter of this article is using diffusion processes to obtain chemically stable compounds with a low reactivity and higher mechanical properties in material surface layer. These processes were implemented by remelting the surface of a given material in arc process using a TIG welding method. Nitrogen was used as an alloying element in experiments. The experiment assumed that the dissociation and ionization of gases, enabling the ionization of diffusion processes in the surface layer of remelted steel, will be achieved by means of electric arc. Conditions for the formation of hard and stable structures with required properties should have been created by enriching the surface layer. The STN 41 5230 steel was used in experiments. After remelting, samples were examined on hardness and relative abrasive wear resistance, which are crucial in terms of required properties of given surface layers. In addition to hardness values in the surface layer, also its behaviour inwards the material up to thermally unaffected base material was determined. When remelting in the environment containing nitrogen, the values of examined quantities increased.

FORECASTING GAS EXCHANGE DYNAMICS OF GOBS WITH MINING AIR AND SURFACE LAYER OF ATMOSPHERE

2020 ◽  
Vol 3 (1) ◽  
pp. 253-262
Author(s):  
A.N. KACHURIN ◽  
◽  
O.A. AFANASIEV ◽  
D.N. SHKURATCKYI ◽  
◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Surface Layer ◽  
Gas Exchange ◽  
Atmospheric Pressure ◽  
Diffusion Processes ◽  
Diffusion Mode ◽  
Diffusion Flow ◽  
Coal Seams ◽  
One Dimensional ◽  
And Diffusion

It is noted that filtration and diffusion processes in coal seams, worked-out spaces and workings of carbon dioxide mines are satisfactorily described by parabolic filtration equations for one-dimensional semi-infinite space. Linearization of the equations of filtration gas transport allows obtaining analytical solutions for a wide class of applied problems. A model has been developed for the movement of dead air through underworked rocks from mined-out areas to the earth's surface for the conditions of the Eastern Donbass and Kuzbass. At a stable atmospheric pressure, gas exchange occurs in a diffusion mode. The dependence of the diffusion flow of gases from the worked-out space to the earth's surface is obtained. Dependencies for the forecast of methane release on the earth's surface of allotments of the liquidated mines of Kuz-Bass are obtained.

Structural Characterization of the Chromium-Iron Alloy Formed by Thermal Diffusion Processes

2013 ◽  
Vol 651 ◽  
pp. 284-288 ◽  
Author(s):  
Roberto Baca Arroyo
Keyword(s):  
Thermal Diffusion ◽  
Diffusion Processes ◽  
Iron Alloy ◽  
Magnetic Coupling ◽  
Magnetic Ordering ◽  
X Ray Diffraction ◽  
Lattice Constants ◽  
Air Atmosphere ◽  
Direct Band

We have investigated the chromium-iron alloy and compared it to the oxides α-Fe2O3 (Eg = 4.8eV) and α-Cr2O3 (Eg = 2.1eV). It is known that α-Cr2O3 and α-Fe2O3 both adopt a corundum-type structure, but display differences in the lattice constants, direct band gap, and magnetic ordering of the cations. The chromium-iron alloy was synthesized by thermal diffusion processes of both chromium and iron thin-films in air atmosphere conditions. We have studied the elastic distortions related to nature of the relative strains as well as magnetic coupling between Fe and Cr from the X-ray diffraction studies.

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