scholarly journals Charge and elemental composition of plasma generated by sputtering of powder target from amorphous boron

2021 ◽  
Vol 2064 (1) ◽  
pp. 012042
Author(s):  
Y F Ivanov ◽  
V V Shugurov ◽  
O V Krysina ◽  
V E Prokopiev
Keyword(s):  
Elemental Composition ◽  
Plasma Potential ◽  
Charge Composition ◽  
Amorphous Boron ◽  
Boron Powder ◽  
Temperature Plasma ◽  
Discharge System ◽  
Powder Target ◽  
Ion Plasma ◽  
Boron Ions

Abstract One of the effective and widespread methods of surface hardening of metal products is an ion-plasma saturation of the surface of machine parts and mechanisms with various elements (nitrogen, oxygen, carbon). Less investigated method is the process of ion-plasma saturation of the metals and alloys surface with boron. The purpose of the present work is to develop a method for the formation and study of parameters (electron temperature, plasma potential and concentration), elemental and charge composition of plasma generated at sputtering of a target from amorphous boron powder. To achieve the stated goal, a discharge system with a hot anode made of powder boron, as well as a pulse arc evaporator with a hot cathode made of sintered boron powder, was developed, designed, created and tested. Charge and elemental composition of boron-containing plasma generated during powder target sputtering from amorphous boron are defined by optical spectrometry method. It is shown that the generated plasma contains mainly neutral atoms and single-charge boron ions, as well as iron, silicon, copper and argon particles.

scholarly journals Deposition of boron films using a discharge system with a hot boron anode

2021 ◽  
Vol 2064 (1) ◽  
pp. 012068
Author(s):  
V V Shugurov ◽  
Yu F Ivanov
Keyword(s):  
Hollow Cathode ◽  
Arc Discharge ◽  
Boron Powder ◽  
Discharge System ◽  
Powder Target ◽  
Current Voltage ◽  
Discharge Parameters ◽  
Current Voltage Characteristics ◽  
Anode Temperature

Abstract This work describes a discharge system for heating and evaporation of a boron powder target based on a non-self-sustained arc discharge with a filament, a hollow cathode and a hot combined anode. The measurements of the current-voltage characteristics of the discharge with a hot anode and the dependence of the anode temperature on the discharge parameters are presented. The modes of deposition of boron films have been determined.

Effect of Grain Refinement on the Elemental Composition and Nanohardness of the Surface Layers in AISI 316L Austenitic Steel Subjected to Ion-Plasma Hardening

2018 ◽  
Vol 385 ◽  
pp. 267-272 ◽  
Author(s):  
Valentina Moskvina ◽  
Elena Astafurova ◽  
Galina Maier ◽  
Kamil Ramazanov ◽  
Sergey Astafurov ◽  
...  
Keyword(s):  
Dislocation Density ◽  
Austenitic Steel ◽  
Elemental Composition ◽  
Grain Refinement ◽  
Surface Hardening ◽  
Coarse Grained ◽  
Aisi 316L ◽  
Surface Layers ◽  
Plasma Hardening ◽  
Ion Plasma

We study the effect of the grain refinement on the elemental composition and nanohardness of the surface layers in AISI 316L austenitic steel processed by ion-plasma hardening. Ion-plasma hardening of the samples with (1) grain-subgrain (with high dislocation density) and (2) coarse-grained structures causes a surface hardening and formation of the composite layers with a thickness of about 20 μm. The nanohardness and depth profiles of elemental concentration of nitrogen, carbon and oxygen in the ion-plasma hardened layers depends on pretreatment regime of the steel specimens. Cold rolling causes an increase in the grain and subgrain boundaries fraction and dislocation density in steel specimens, provides more intensive accumulation of interstitial atoms in thin surface 5 μm-layer, leads to additional surface hardening and suppress carbon diffusion into depth of the specimens as compared with coarse-grained structure.

scholarly journals Powders of metal borides obtained by the SHS method and low-temperature plasma

2018 ◽  
Vol 243 ◽  
pp. 00015
Author(s):  
Ilya Zhukov ◽  
Alexander Vorozhtsov ◽  
Vladimir Promakhov ◽  
Yana Dubkova ◽  
Alexander Zhukov ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Titanium Boride ◽  
Analysis Data ◽  
High Energy ◽  
Thermal Analysis Data ◽  
Energy Materials ◽  
Boron Powder ◽  
Temperature Plasma ◽  
Metal Borides ◽  
Shs Method

This paper introduces principle possibility of producing aluminum and titanium boride predetermined morphology using the SHS method and plasma processing. Thermal analysis data for synthesized boride powders in comparison with boron powder and nano-sized aluminum are presented It was found that the synthesized metal borides, according to the thermal analysis data, are promising as a fuel in high-energy materials: the oxidation state of AlB2 is ~ 80%, at a degree of boron oxidation ~ 20%, aluminum ~ 67%.

Preparation and characterization of amorphous boron powder with high activity

2014 ◽  
Vol 24 (5) ◽  
pp. 1446-1451 ◽  
Author(s):  
Zhi-he DOU ◽  
Ting-an ZHANG ◽  
Guan-yong SHI ◽  
Chao PENG ◽  
Ming WEN ◽  
...  
Keyword(s):  
High Activity ◽  
Amorphous Boron ◽  
Boron Powder

Preparation and Characterization of Mg1−x B2 Bulk Samples and Cu/Nb Sheathed Wires with Low Grade Amorphous Boron Powder

2013 ◽  
Vol 27 (2) ◽  
pp. 497-504 ◽  
Author(s):  
J.-C. Grivel ◽  
A. Alexiou ◽  
K. Rubešová ◽  
X. Tang ◽  
N. H. Andersen ◽  
...  
Keyword(s):  
Low Grade ◽  
Amorphous Boron ◽  
Boron Powder

scholarly journals The use of amorphous boron powder enhances mechanical alloying in soft magnetic FeNbB alloy: A magnetic study

2013 ◽  
Vol 113 (17) ◽  
pp. 17A330 ◽  
Author(s):  
J. J. Ipus ◽  
J. S. Blázquez ◽  
V. Franco ◽  
A. Conde
Keyword(s):  
Mechanical Alloying ◽  
Magnetic Study ◽  
Amorphous Boron ◽  
Soft Magnetic ◽  
Boron Powder

Effect of Boron Purity on Superconducting Properties of SiC Doped MgB2

2008 ◽  
Vol 41-42 ◽  
pp. 253-258 ◽  
Author(s):  
Bo Qu ◽  
Xu Dong Sun ◽  
Zhi Meng Xiu ◽  
Jung Ho Kim ◽  
Shi Xue Dou ◽  
...  
Keyword(s):  
Raw Materials ◽  
Low Cost ◽  
Xrd Analysis ◽  
Particle Sizes ◽  
Amorphous Boron ◽  
Boron Powder ◽  
Boron Particle ◽  
Mgb2 Superconductors ◽  
Doped Mgb2 ◽  
Main Impurity

The effect of purity of amorphous boron raw materials on properties of the hot pressed SiC doped MgB2 superconductor was investigated. MgB2 superconductors with magnetic Jc over 106 A/cm2 and remaining Jc of 105 A/cm2 at 4.2 K and 5 T were fabricated by hot pressing using both high purity (99.00%) and low purity (88.84%) boron powders. XRD analysis shows that purity of the boron powders has little effect on phase component of the MgB2 samples. If the main impurity in amorphous boron is Mg, low purity low cost boron powder is suitable as one of the raw materials for fabricating MgB2. Particle sizes of boron has significant effect on microstructure and properties of MgB2. Smaller boron particle size leads to smaller grain size of MgB2, higher density, higher lattice distortion, and thus higher magnetic Jc.

scholarly journals Combined effects of electronic trapping and non-thermal electrons on the expansion of laser produced plasma into vacuum

2014 ◽  
Vol 32 (3) ◽  
pp. 391-398 ◽  
Author(s):  
Djemai Bara ◽  
Mourad Djebli ◽  
Djamila Bennaceur-Doumaz
Keyword(s):  
Plasma Potential ◽  
The Self ◽  
Intense Laser ◽  
Potential Wells ◽  
Energetic Electrons ◽  
Slowing Down ◽  
Ion Plasma ◽  
Self Similar Solution ◽  
Ion Laser ◽  
Self Similar

AbstractIn this work, the effect of electron trapping on the self-similar expansion of electron-ion laser plasma into vacuum, combined with the effect of non-thermal (energetic) electrons is studied. For this, a mono-dimensional, non-relativistic model where the ions are cold and governed by fluid equations is used. In the approximation of quasi-neutrality of charge, the obtained self-similar solution shows that for ion (plasma) behavior, the presence of an important number of non-energetic trapped electrons in the plasma potential wells has the effect of slowing down the expansion, whereas the phenomenon of presence of energetic electrons makes the influence of trapping effect on the self-similar expansion very weak even in the case of a very small number of energetic electrons. This study is of interest in the context of the investigation of mono-energetic ion beams from intense laser interactions with plasmas.

scholarly journals Regularities of structure formation and physical properties of multilayered composites based on W, Ta, Нf, Ti, Mo, Сr, Al, and С

2020 ◽  
Vol 21 (2) ◽  
pp. 347-354
Author(s):  
V. I. Perekrestov ◽  
Yu. O. Kosminska ◽  
Yu. V. Gannych ◽  
G. S. Kornyushchenko
Keyword(s):  
Elemental Composition ◽  
Composite Coatings ◽  
Fabrication Technique ◽  
Grain Sizes ◽  
Plasma Sputtering ◽  
Ion Plasma ◽  
Composite Layers ◽  
Inner Surface ◽  
Multilayered Composites ◽  
Gradient Change

New fabrication technique of multilayered composite coatings on inner surface of pipes is developed which is based on ion–plasma sputtering of rod–like target composed of various metals and graphite. It is established that gradient change of elemental composition in the direction Сr→W→Mo→Ta→Hf→Ti→C→Ti/Al→C is accompanied by transition from metal mixture carbide to titanium carbide with the grain sizes of ~ 8–15 nm. It is found that increase in microhardness up to ~ 26 GPa is caused by additional surface heating by thermal radiation from the ion–heated rod and by elemental composition of the composite layers.

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