scholarly journals Making Ceramic Protective Coatings on Titanium Boride Base by Electric Arc Surfacing with SHS Electrodes in an Argon Atmosphere

2020 ◽  
pp. 012-016
Author(s):  
A.O. Zhidovich ◽  
◽  
A.M. Stolin ◽  
P.M. Bazhin ◽  
A.S. Konstantinov ◽  
...  
Keyword(s):  
Phase Composition ◽  
Layered Structure ◽  
Protective Coatings ◽  
Titanium Substrate ◽  
Titanium Boride ◽  
Electric Arc ◽  
Argon Atmosphere ◽  
Argon Flow ◽  
Flow Intensity ◽  
Arc Current

SHS extruded TiB / 30 wt.% Ti-layered long rods with a length of more than 100 mm and a diameter of 3 mm were made by electric arc surfacing on a titanium substrate in an argon atmosphere. Technological modes of coating deposition (electric arc current, arc speed, argon flow intensity, etc.) have been worked out by the method of electric arc surfacing. The structure and phase composition of the initial surfacing electrode and coating are investigated. It is shown that the deposited coating has a layered structure, its microstructure is represented by titanium diboride and monoboride in a matrix consisting of a solid boron in titanium solution. It was found that the structure and phase composition of the coating are predominantly identical to the structure and phase composition of the used SHS electrodes. The microhardness of the deposited electrode and coating was 1024 and 1420 HV, respectively.

The effect of gas atmosphere on the coating formation by electric arc surfacing with cermet SHS electrodes of the TiB2–Co2B composition

2021 ◽  
Vol 6 (3) ◽  
pp. 216-224
Author(s):  
Alexandra O. Zhidovich ◽  
Alexander M. Stolin ◽  
Andrey P. Chizhikov ◽  
Pavel M. Bazhin ◽  
Alexander S. Konstantinov
Keyword(s):  
Phase Composition ◽  
Metal Matrix ◽  
Protective Coatings ◽  
Steel Substrate ◽  
Nitrogen Atmosphere ◽  
Electric Arc ◽  
Argon Atmosphere ◽  
Shs Extrusion ◽  
Wide Range ◽  
Gas Atmosphere

Due to their unique properties, metal-matrix composite materials, when used as a surfacing material for electric arc surfacing, provide high properties of the deposited layers. SHS-extrusion is a promising method for a wide range of surfacing metal-matrix electrodes. The gas environment of surfacing affects the quality of coatings formed by SHS electrodes, their microstructure and properties. In this paper, cermet SHS electrodes of the TiB2–Co2B composition obtained by SHS-extrusion were used to form protective coatings on a steel substrate by electric arc surfacing in an argon atmosphere and in a nitrogen atmosphere. The elemental and phase composition, as well as the microstructure of the deposited layers, were investigated. Based on the conducted studies, the influence of the gas atmosphere on the formation of the structure of cermet coatings was established. It is shown that, despite the similar phase composition, there are fundamental differences in the microstructures of the deposited coatings, which are caused by the partial fusion of the tungsten electrode and the transfer of the electrode material in the coating during surfacing in an argon atmosphere. The maximum values of the microhardness of coatings deposited in a nitrogen atmosphere exceed the maximum microhardness of coatings obtained by surfacing in an argon atmosphere by 200–450 HV.

scholarly journals Experimental Investigation of a Magnetically Balanced Arc in a Transverse Argon Flow

1966 ◽  
Vol 88 (1) ◽  
pp. 27-30 ◽  
Author(s):  
T. W. Myers ◽  
C. N. McKinnon ◽  
J. C. Lysen
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Electric Arc ◽  
Test Apparatus ◽  
Gas Velocity ◽  
Argon Gas ◽  
Argon Flow ◽  
Arc Current

An experimental study of an electric arc in crossed convective and magnetic fields has been made. An electric arc was established across a rectangular test section through which argon gas was flowing at approximately atmospheric pressure and velocities up to 100 m/sec. Magnetic field strengths up to 3 webers/m2, oriented so that the Lorentz force opposed the convective force on the arc, were applied perpendicular to both the arc and the direction of the argon gas flow. The test apparatus and the procedure used to obtain the experimental relationship between the velocity of the argon flow and the balancing magnetic field are described. An analysis which assumed the magnetically balanced arc to be a gaseous cylinder positioned between the electrodes and with a diameter varying directly as the arc current satisfactorily explained the observed dependence of the balancing magnetic field on the gas velocity.

scholarly journals Production of target cathodes from composite silicides for applying protective coatings using casting and deformation technologies

2021 ◽  
pp. 68-75
Author(s):  
I. A. Ivanov ◽  
A. G. Slutsky ◽  
V. A. Scheinert ◽  
A. I. Ivanov ◽  
A. N. Bely
Keyword(s):  
Protective Coatings ◽  
Pure Metal ◽  
Electric Arc ◽  
Argon Atmosphere ◽  
Raw Material ◽  
Induction Melting ◽  
Identical Composition ◽  
Arc Evaporation ◽  
Percentage Ratio ◽  
Shs Method

The article discusses the results of manufacturing multicomponent consumable cathodes of vacuum electric arc evaporation plants. To obtain ingots of complex silicide as a raw material for the manufacture of target cathodes, it is proposed to use induction melting of pure metal charge materials in an argon atmosphere.The method made it possible to obtain ingots of complex silicide with a composition close to the calculated one and a density of at least 93 %. Further forming of the cathode takes place when controlling the powder fractions by their percentage ratio with a pressing force of at least 50 tons. The results obtained are compared with the SHS method of manufacturing cathodes of identical composition.

Phase composition and formation mechanisms of a high-velocity electric arc-sprayed FeNiCrAl coating

2018 ◽  
Vol 769 ◽  
pp. 998-1006 ◽  
Author(s):  
Haoliang Tian ◽  
Changliang Wang ◽  
Mengqiu Guo ◽  
Zhihui Tang ◽  
Shicheng Wei ◽  
...  
Keyword(s):  
Phase Composition ◽  
High Velocity ◽  
Electric Arc ◽  
Formation Mechanisms

Electric Arc Furnace Based on Fuzzy Neural Network Control System and MATLAB Simulation

2011 ◽  
Vol 48-49 ◽  
pp. 491-495 ◽  
Author(s):  
Qiang Li ◽  
Peng Hua Wu
Keyword(s):  
Neural Network ◽  
Fuzzy Neural Network ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Network Control ◽  
Time Variability ◽  
Neural Network Control ◽  
Arc Furnace ◽  
Fuzzy Neural ◽  
Arc Current

EAF steelmaking is a complex physical and chemical reactions，has Highly nonlinearity, time variability and strong coupling. As the electrode's contact with the charging circuit, charging the collapse of the gasification furnace components and liquid metal boiling and other factors, often result in dramatic fluctuations in arc current. At this point we need to quickly adjust the location of electrodes, so that arc current stable base on this within a certain range. This article in the fuzzy control and neural network’s foundation,will study a kind based on three-phase consciousness electric arc furnace predictive control new method, Using the fuzzy neural network control adjusting electrode, further enhancing the effectiveness of electric arc furnace’synthesis movement.

scholarly journals Thin Degradable Coatings for Optimization of Osteointegration Associated with Simultaneous Infection Prophylaxis

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3495 ◽  
Author(s):  
Sophie Burtscher ◽  
Peter Krieg ◽  
Andreas Killinger ◽  
Ali Al-Ahmad ◽  
Michael Seidenstücker ◽  
...  
Keyword(s):  
Phase Composition ◽  
Calcium Phosphate ◽  
Release Kinetics ◽  
Titanium Substrate ◽  
Ceramic Coatings ◽  
Microbial Colonization ◽  
Flame Spraying ◽  
Infection Prophylaxis ◽  
Aseptic Prosthesis Loosening

One of the most common causes of implant failure is aseptic prosthesis loosening. Another frequent complication after prosthesis implant is the microbial colonization of the prosthesis surface, which often leads to a replacement of the prosthesis. One approach to reduce these complications is the application of bioactive substances to implant surfaces. Both an antibiotic prophylaxis and a faster osteointegration can be obtained by incorporation of bactericidal active metals in degradable calcium phosphate (CaP) coatings. In this study, thin degradable calcium phosphate ceramic coatings doped with silver (Ag), copper (Cu), and bismuth (Bi) on a titanium substrate were prepared with the aid of the high-velocity suspension flame spraying (HVSFS) coating process. To characterize the samples surface roughness, brightfield microscopy of the coatings, X-ray diffraction (XRD)-analysis for definition of the phase composition of the layers, Raman spectroscopy for determination of the phase composition of the contained metals, element-mapping for Cu-content verification, release kinetics for detection of metal ions and ceramic components of the coatings were carried out. The aim of this study was to evaluate in vitro biocompatibility and antimicrobial activity of the coatings. For biocompatibility testing, growth experiments were performed using the cell culture line MG-63. Cell viability was investigated by Giemsa staining and live/dead assay. The WST-1 kit was used to quantify cell proliferation and vitality in vitro and the lactate dehydrogenase (LDH) kit to quantify cytotoxicity. The formation of hydroxyapatite crystals in simulated body fluid was investigated to predict bioactivity in vivo. The Safe Airborne Antibacterial Assay with Staphylococcus aureus (S. aureus) was used for antimicrobial testing. The results showed good biocompatibility of all the metal doped CaP coatings, furthermore Cu and Ag doped layers showed significant antibacterial effects against S. aureus.

Structure and phase composition of protective coatings on steel produced by methods of liquid-phase calorizing

2015 ◽  
Vol 116 (9) ◽  
pp. 879-887 ◽  
Author(s):  
I. G. Brodova ◽  
I. G. Shirinkina ◽  
Yu. P. Zaikov ◽  
V. A. Kovrov ◽  
Yu. M. Shtefanyuk ◽  
...  
Keyword(s):  
Phase Composition ◽  
Liquid Phase ◽  
Protective Coatings

Influences of Argon Atmosphere on Ceramic Coatings on Ti–6Al–4V Alloy by Micro-Plasma Oxidation in Different Solutions

2007 ◽  
Vol 546-549 ◽  
pp. 1717-1720
Author(s):  
Guo Dong Hao ◽  
Zhao Hua Jiang ◽  
Xiao Hong Wu ◽  
Yan Hua Cao
Keyword(s):  
Phase Composition ◽  
Ceramic Coatings ◽  
Argon Atmosphere ◽  
Element Content ◽  
Plasma Oxidation ◽  
Coating Surface ◽  
Better Than

Compound ceramic coatings were prepared on Ti-6Al-4V allosy by pulsed bi-polar Micro-plasma Oxidation (MPO) in NaAlO2(S1) and Na2SiO3(S2) solution respectively. The coated samples were calcined in argon under 1000 oC. The phase composition,morphology and element content of the ceramic coatings were investigated by XRD, SEM and XRF. After oxidation in argon, The Al2TiO5 of S1 coating surface was decomposed into Al2O3. SiO2 was crystalized in S2 coating with the final proportion of SiO2 to TiO2 on the coating surface is 81:18. The morphology of the ceramic coatings after the calcination was also different. S1 coatings calcined in argon were fine, grains and pores were smaller and were combined tightly with the substrate, on the contrary, S2 coatings calcined in argon cracked on the coating surface and were separated with the substrate. The content of elements in the coatings both changed a little, which may be due to the reaction of the substrate in the oxidation. According to the phase composition and the morphology of the coatings, S1 coatings are better than S2 coatings.

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