Multicriteria optimization of technological parameters for obtaining composite material Pb-C and carbon coating

2020 ◽  
pp. 166-174
Author(s):  
С.Н. Сергеенко ◽  
А.Н. Васильев ◽  
Д.В. Василенко
Keyword(s):  
Composite Material ◽  
Multicriteria Optimization ◽  
Carbon Coating ◽  
Lead Acid Battery ◽  
Technological Parameters ◽  
Carbon Coatings ◽  
Graphite Content ◽  
Technological Factors ◽  
Battery Electrode ◽  
Optimal Values

Предложена методика и проведена многокритериальная оптимизация значений технологических факторов получения порошкового композиционного материала Pb-C и углеродных покрытий. Определены оптимальные значения: - содержания и типа армирующих нитей, обеспечивающих повышенный комплекс механических свойств при минимальном содержании армирующих нитей; - содержания графита и продолжительности механической активации шихты, обеспечивающих повышенные значения прочности на срез и твердости композиционного материала Pb-C электрода свинцово-кислотного аккумулятора при утилизации отходов. На основе проведенной многокритериальной оптимизации предложены улучшенные технологические схемы изготовления композитов. A technique is proposed and a multicriteria optimization of the values of technological factors for obtaining a powder composite material Pb-C and carbon coatings is carried out. The optimal values have been determined: - the content and type of reinforcing threads, providing an increased set of mechanical properties with a minimum content of reinforcing threads; - the graphite content and the duration of the mechanical activation of the mixture, providing increased values of shear strength and hardness of the composite material Pb-C lead-acid battery electrode during waste disposal. Basierend auf der Multikriteria-Optimierung werden verbesserte technologische Schemata für die Herstellung von Verbundwerkstoffen vorgeschlagen.

Microtribological properties of hard amorphous carbon protective coatings for thin-film magnetic disks and heads

1997 ◽  
Vol 211 (4) ◽  
pp. 365-372 ◽  
Author(s):  
V N Koinkar ◽  
B Bhushan
Keyword(s):  
Amorphous Carbon ◽  
Carbon Coating ◽  
Protective Coatings ◽  
Ion Beam ◽  
Crystal Silicon ◽  
Carbon Coatings ◽  
Magnetic Disks ◽  
Hydrogenated Amorphous Carbon ◽  
Hydrogenated Amorphous ◽  
Cathodic Arc

For long durability of magnetic media and head sliders, protective overcoats of hydrogenated amorphous carbon (a-C:H) are generally used. In this study, microtribological studies of hydrogenated amorphous carbon coatings deposited on a single-crystal silicon using three different deposition techniques—sputtering, ion beam and cathodic arc—were studied using atomic force/friction force microscopy (AFM/FFM). Roughnesses of all coatings at two scan sizes of 1 μm × 1 μm and 10 μm × 10 μm are comparable. Surface topography of sputtered carbon coating shows some particulates on the surface. Cathodic arc carbon coating exhibits the lowest coefficient of friction value followed by ion beam and sputtered carbon coatings. Microscratch and wear resistance and nanohardness of cathodic arc carbon coating are superior to those of ion beam and sputtered carbon coatings. Cathodic arc deposited carbon coatings are potential candidates for magnetic disks and heads.

scholarly journals PROPERTIES OF NITROGEN-DOPED AMORPHOUS CARBON COATINGS OBTAINED BY IMPULSE VACUUM-ARC METHOD

2018 ◽  
Vol 59 (9) ◽  
pp. 68 ◽  
Author(s):  
Aleksandr I. Poplavskiy ◽  
Aleksandr Ya. Kolpakov ◽  
Marina E. Galkina ◽  
Igor Yu. Goncharov ◽  
Roman A. Lyubushkin ◽  
...  
Keyword(s):  
Amorphous Carbon ◽  
Carbon Coating ◽  
Vacuum Arc ◽  
Internal Stresses ◽  
Structure And Properties ◽  
Carbon Coatings ◽  
Nitrogen Doped ◽  
Structure Surface ◽  
Amorphous Carbon Coatings ◽  
Carbon Plasma

The paper presents results of the research of the structure and properties of nitrogen-doped amorphous carbon coatings obtained in the vacuum from the flow of pulsed carbon plasma. The doping by nitrogen of carbon coating was determined to lead to increases in electrical conductivity, reductions of internal stresses, reduce of density, hardness and modulus, and to the change in structure, surface morphology and tribological characteristics.

scholarly journals Optimization of technological factors of magneticelectric strengthening

2020 ◽  
Vol 65 (4) ◽  
pp. 404-412
Author(s):  
L. M. Akulovich ◽  
A. V. Miranovich ◽  
M. M. Dechko
Keyword(s):  
Magnetic Induction ◽  
Design Method ◽  
Technological Factor ◽  
Powder Coating ◽  
Optimality Criteria ◽  
Technological Factors ◽  
Control Factors ◽  
Limit Value ◽  
Optimal Values ◽  
Process Productivity

In order to determine the optimal values of technological factors for electromagnetic hardening process (EMHP), an experimental study of the process of applying ferromagnetic Fe – 2 % V powder coating on 30ХГС (GOST 4543- 71) steel parts was conducted. The process productivity and coating continuity were selected as the target parameters for the EMHP optimization. By applying the experimental design method, based on 5-factor central composite rotatable uniform plan, we have created stochastic models, expressed in regression functions of the second order. It has been determined that the magnetic induction value in the working gap is the most significant technological factor, affecting both target parameters. With the increasing induction magnitude the process productivity and the coating continuity increase non-linearly until the maximum limit value, which was attributed to the forming of current-conductive chains in the working gap, that have varying electrical conductivity and different directions relative to the lines of magnetic field forces. In order to determine the optimal EMHP mode we have solved the problems of finding maximums for greatest productivity and coating continuity within the constraints of the studied factor range. The discovered EMHP-modes, optimal for each separate parameter, coincide only in the value of the magnetic induction and the discharge density. The optimal values for the other control factors belong to different areas of factor range for different optimization parameters. To determine the EMHP modes, balanced against the both parameters, the problem of multicriteria optimization was solved. The obtained solution reveals that the density of discharge currents produces the biggest impact on the process productivity and the coating continuity within the balanced modes. At the same time the high continuity of the coating is achieved by the supplementing increase of peripheral speed of the processed workpiece, which leads to evener distribution of the intensively supplied mass of the ferromagnetic powder on the treated surface. The recommended technological modes of EMHP have been determined, based on the generalized optimality criteria.

INFLUENCE OF TECHNOLOGICAL PARAMETERS ON CHARACTERISTICS OF POLYMER COMPOSITE MATERIALS IN AUTOMATED LAYUP OF PREPREGS (review)

2021 ◽  
pp. 46-55
Author(s):  
P.N. Timoshkov ◽  
◽  
V.A. Goncharov ◽  
M.N. Usacheva ◽  
A.V. Khrulkov ◽  
...  
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Technological Properties ◽  
Technological Parameters ◽  
Technological Factors ◽  
Rolling Pressure ◽  
Material Temperature

The main technological factors when using ATL and AFP technologies are material temperature, laying speed, rolling pressure and no deviation from the required laying trajectory. The article discusses the influence of technological factors on some characteristics of polymer composite materials. The optimum laying temperature should provide the required adhesion. The rate of laying should provide heating of the material without its technological properties. The rolling pressure during laying should ensure optimal porosity and thickness of the material.

Preparation of CF Reinforced PPS/Graphite Conductive Composite for Bipolar Plate

2014 ◽  
Vol 875-877 ◽  
pp. 1245-1249
Author(s):  
Hua Yong Zhang ◽  
Xiao Deng Yang ◽  
Xiao Jian Liu ◽  
Tao Wang
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Bipolar Plate ◽  
Economic Aspect ◽  
Polyphenylene Sulfide ◽  
Performance Requirement ◽  
Conductive Composite ◽  
Graphite Content ◽  
Molding Method

A kind of carbon fiber (CF) reinforced conductive composite material with graphite powders and polyphenylene sulfide (PPS) resin powders were fabricated by the hot-pressure molding method. The influence of graphite content and CF addition on the conductivity, flexural strength and density of the composite were investigated. Took into account the performance requirement of the bipolar plate of PEMFC and economic aspect, the suitable conditions for the fabrication of bipolar plate were found: the proportion of graphite and PPS was 75/25 and the addition of CF was 2.5%(wt).

scholarly journals A density functional theory study of the carbon-coating effects on lithium iron borate battery electrodes

2017 ◽  
Vol 19 (3) ◽  
pp. 2087-2094 ◽  
Author(s):  
Simon Loftager ◽  
Juan María García-Lastra ◽  
Tejs Vegge
Keyword(s):  
Density Functional Theory ◽  
Cathode Material ◽  
Carbon Coating ◽  
Density Functional ◽  
Li Ion Battery ◽  
Density Functional Theory Study ◽  
Iron Borate ◽  
Functional Theory ◽  
Carbon Coatings ◽  
Li Ion

Density functional theory modelling shows that carbon coatings on a LiFeBO3 cathode material does not impede the Li transport in a Li-ion battery.

A new room temperature and solvent free carbon coating procedure for battery electrode materials

2013 ◽  
Vol 6 (11) ◽  
pp. 3363 ◽  
Author(s):  
Alexandre Ponrouch ◽  
Alejandro R. Goñi ◽  
Moulay T. Sougrati ◽  
Mohamed Ati ◽  
Jean-Marie Tarascon ◽  
...  
Keyword(s):  
Carbon Coating ◽  
Room Temperature ◽  
Electrode Materials ◽  
Free Carbon ◽  
Solvent Free ◽  
Battery Electrode ◽  
Coating Procedure

scholarly journals Variation of carbon coatings on the electrochemical performance of LiFePO4 cathodes for lithium ionic batteries

RSC Advances ◽  
2017 ◽  
Vol 7 (70) ◽  
pp. 44296-44302 ◽  
Author(s):  
Weiwei Jiang ◽  
Mengqiang Wu ◽  
Fei Liu ◽  
Jian Yang ◽  
Tingting Feng
Keyword(s):  
Electrochemical Performance ◽  
Carbon Coating ◽  
Rate Capability ◽  
Superior Performance ◽  
Hard Carbon ◽  
Carbon Coatings ◽  
Soft Carbon

Asphalt-derived and glucose-derived carbon proved to be soft carbon-coating (SCC) and hard carbon-coating (HCC), and it was found that LFP/SCC showed a superior performance in capacity and rate capability than that of LFP/HCC.

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