Controlled synthesis of multifunctional coatings by micro-arc oxidation method

2022 ◽  
Vol 13 (1) ◽  
pp. 0-0
Keyword(s):  
Protective Coatings ◽  
Electrical Circuit ◽  
Automated System ◽  
Controlled Synthesis ◽  
Regression Equations ◽  
Technological Parameters ◽  
Oxide Layers ◽  
Oxidation Method ◽  
Micro Arc Oxidation

The article is devoted to the development of the methodology for the controlled synthesis of protective coatings by the micro-arc oxidation method in order to improve the efficiency of this technology and the quality of the obtained oxide layers. Methodology includes a mathematical model of a galvanic cell based on an equivalent electrical circuit, as well as a model of the interconnections between the technological parameters of the micro-arc oxidation (MAO) process and the properties of the obtained oxide layers based on graph theory. The indicated dependences are formalized using methods of regression and correlation analysis of experimental data. A technique for the controlled synthesis of MAO coatings using the obtained regression equations is proposed. The structure and functioning algorithm of an intelligent automated system for the controlled synthesis of MAO coatings are developed. A prototype of this system was used to obtain experimental dependences of reaction parameters on the influence parameters of the micro-arc oxidation process.

Modeling Technological Parameters for Producing Combined Electrospark Deposition Coatings

2019 ◽  
Vol 968 ◽  
pp. 131-142 ◽  
Author(s):  
Viacheslav Tarelnyk ◽  
Ievgen Konoplianchenko ◽  
Nataliia Tarelnyk ◽  
Aleksey Kozachenko
Keyword(s):  
Electrode Materials ◽  
Protective Coatings ◽  
High Hardness ◽  
Mass Transfer Process ◽  
Electrode Pair ◽  
Surface Plastic ◽  
Technological Parameters ◽  
Electrospark Deposition ◽  
Wear Resistant

The paper represents a formalized methodology for solving the problem of creating fundamentally new materials, such as "base - coating" ones, which have increased surface wear resistance and relatively high strength and viscosity. Electrospark alloying (ESA) method is proposed as a process for depositing protective coatings on metal surfaces. There are considered the issues of improving the quality of the coatings formed by the ESA method. There is specified a feature of processing the surfaces having been treated with the use of the ESA method, which feature being associated with a relatively small thickness of the layers formed (tens of micrometers). Since to reduce the roughness of the surface, the process of grinding is difficult or even unacceptable to perform, it has been suggested to use the method of surface plastic deformation (SPD). One of the effective SPD methods for finishing the parts is a diamond smoothing process, which, in contrast to running-in with a ball or roller, allows processing the parts of very high hardness values. As a reserve to improve the quality of coatings formed by the ESA method, there is considered a process for producing combined electrospark deposition coatings (CEC) with hard wear-resistant and soft anti-friction metals integrated therein. There are represented the results of mass transfer process investigation performed at forming the CEC on the specimens of steel 45 with indium, tin and copper being used as soft antifriction metals, and tungsten and hard alloy of VK8 grade applied as wear-resistant materials. There is represented a mathematical model for calculating the main ESA technological parameters being necessary for forming the CEC and allowing to predict the weight gain (increase in weight) and size gain (increase in size) at the cathode (the part). It allows predicting the CEC main technological parameters for any electrode pair materials (substrate material and electrode materials making up the CEC).

scholarly journals Effect of Microstructure of Al - Si - alloy on the Quality of the Layer Formed with Micro - Arc Oxidation Method

2015 ◽  
Vol 8 (6) ◽  
pp. 6-9 ◽  
Author(s):  
S. K. Kiseleva ◽  
◽  
L. I. Zainullina ◽  
M. M. Abramova ◽  
A. A. Pinegina ◽  
...  
Keyword(s):  
Oxidation Method ◽  
Micro Arc Oxidation ◽  
Effect Of Microstructure

scholarly journals RESEARCH OF THE POSSIBILITY OF INCREASING THE QUALITY OF PREPARATION OF DRY MIXTURES IN A HORIZONTAL VANE MIXER

2021 ◽  
Vol 6 (10) ◽  
pp. 99-108
Author(s):  
S. Khanin ◽  
N. Kikin ◽  
O. Mordovskaya
Keyword(s):  
Compressive Strength ◽  
Building Materials ◽  
Experimental Studies ◽  
Ultimate Compressive Strength ◽  
Regression Equations ◽  
Technological Parameters ◽  
Sand Mixture ◽  
Paddle Mixer ◽  
Mixed Material

Paddle mixers with horizontal shafts are common at building materials enterprises for the preparation of concretes, mortars, dry mortars. A new design of a horizontal paddle mixer with rod elements located in front of the working surfaces of the blades, changing the trajectories of material particles, increasing their mobility, which leads to an increase in the degree of homogeneity of the mixed material, is considered. The aim of the study was to assess the influence of rod elements on the quality of preparation of a cement-sand mixture, to establish patterns of influence on it by the design and technological parameters of a two-shaft paddle mixer and to determine the areas of their rational values. The following tasks have been solved. A bench installation of a two-shaft horizontal paddle mixer with rod elements has been developed, on which experimental studies have been carried out on the preparation of dry cement-sand mixtures. For the criterion characterizing the quality of the mixture, the ultimate compressive strength of the prism specimens made from it is adopted. Regression equations are obtained that adequately describe the compressive strength of prism samples from the design and technological parameters of the mixer: the angle of the blades, the distance from the working surfaces of the blades to the rod elements, the rotational speed of the blade shafts, and their analysis is performed. The analysis of the change in the ultimate compressive strength of the prism specimens from the parameters under study is carried out, the rational ranges of their values are determined. It was found that a mixer with rod elements allows to obtain a dry cement-sand mixture, products from which have a higher compressive strength. During the work, the method of mathematical planning of experiments was used. As a result of the study, an assessment of the influence of rod elements on the quality of preparation of a cement-sand mixture was carried out, the regularities of the influence on it of the design and technological parameters of a two-shaft paddle mixer and the area of their rational values were established.

scholarly journals Creation of an automated system for measuring technological parameters in the rubber production line

2019 ◽  
Vol 81 (3) ◽  
pp. 225-230
Author(s):  
V. S. Zhirkova ◽  
N. L. Kleymenova ◽  
O. P. Dvoryaninova ◽  
L. I. Nazina ◽  
S. V. Ershov
Keyword(s):  
Production Process ◽  
Technological Process ◽  
Production Line ◽  
High Performance ◽  
Automated System ◽  
Automation System ◽  
Rubber Compound ◽  
Technological Parameters ◽  
High Quality

The introduction of an automated control system on the production line of the rubber compound will reduce the influence of the human factor on the quality of rubber products, which will lead to a significant improvement in the operational and physico-mechanical characteristics of the final product. Also, the development of this system will create a centralized data collection system for creating reports on technological operations of the production process. To obtain high-quality products, it is necessary to control and maintain all technological parameters during equipment operation at the same level, modern means of registration and parameter management. In the production of rubber compounds, it is necessary to ensure a high degree of automation of the main technological equipment, which will make it possible to more accurately dose the ingredients, including dusting ones, to conduct the process in a given temperature regime for the time required to obtain high-quality products. The implementation of automatic control during the use of high-performance equipment is not possible without the use of measuring and control equipment. The article is devoted to the problem of automation of a system for measuring technological parameters on a rubber compound production line in order to improve the quality of manufactured products. The analysis of the technological process is carried out, the controlled parameters of not only the modes of the technological process, but also of raw materials, semi-finished products and finished products are selected. The choice of instruments and local automation equipment is presented, as well as the choice of an industrial microcontroller with which control is carried out at the lower level of an integrated automation system. A functional diagram of the automation of the rubber compound production process is proposed, which will allow to obtain a product with quality indicators corresponding to the regulated level.

Oxide Layer Formation by Micro-Arc Oxidation on Structurally Modified Al-Si Alloys and Applications for Large-Sized Articles Manufacturing

2008 ◽  
Vol 59 ◽  
pp. 204-208 ◽  
Author(s):  
Mikhail M. Krishtal
Keyword(s):  
Oxide Layer ◽  
Layer Growth ◽  
Oxidation Products ◽  
Cylinder Block ◽  
Initial Structure ◽  
Near Surface ◽  
Oxide Layers ◽  
Micro Arc Oxidation ◽  
High Level

The effect of the shape, size and kind of distribution of the silicon inclusions in Al-Si alloys of hypoeutectic, eutectic, and hypereutectic compositions (6–22 % Si) on the quality of oxide layer formed by micro-arc oxidation (MAO) is studied. The hitherto unknown phenomenon of oxide layer growth inhibition by the silicon particles under MAO is discovered and researched. The filling of near-surface pores by oxidation products in MAO process is observed also. The discovered ability to increase the properties of oxide layers obtained by the MAO due to prior directed modifica¬tion of the initial structure provides the good quality of oxide layers for aluminium alloys with high level of silicon content up to hypereutectic compositions of Al-Si alloys. The physical opportunity to get the high quality oxidized layers by MAO on structurally modified Al-Si alloys is confirmed for large-sized Al-Si alloys castings (including cylinder block for engine).

Study on Effects of Technological Parameters of Micro-Arc Oxidation on Properties of Oxide Coatings

2019 ◽  
Vol 24 (4) ◽  
pp. 363-369
Author(s):  
Ekaterina A. Pecherskaya ◽  
◽  
Pavel E. Golubkov ◽  
Oleg V. Karpanin ◽  
Dmitriy V. Artamonov ◽  
...  
Keyword(s):  
Oxide Coatings ◽  
Technological Parameters ◽  
Micro Arc Oxidation

scholarly journals Results of Laboratory Studies of the Automated Sorting System for Root and Onion Crops

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1257
Author(s):  
Alexey Dorokhov ◽  
Alexander Aksenov ◽  
Alexey Sibirev ◽  
Nikolay Sazonov ◽  
Maxim Mosyakov ◽  
...  
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Technological Parameters ◽  
Post Harvest ◽  
Manual Sorting ◽  
Sorting System ◽  
Working Bodies ◽  
Automatic Removal

The roller and sieve machines most commonly used in Russia for the post-harvest processing of root and tuber crops and onions have a number of disadvantages, the main one being a decrease in the quality of sorting due to the contamination of working bodies, which increases the quantity of losses during sorting and storage. To obtain high-quality competitive production, it is necessary to combine a number of technological operations during the sorting process, such as dividing the material into classes and fractions by quality and size, as well as identifying and removing damaged products. In order to improve the quality of sorting of root tubers and onions by size, it is necessary to ensure the development of an automatic control system for operating and technological parameters, the use of which will eliminate manual sorting on bulkhead tables in post-harvest processing. To fulfill these conditions, the developed automatic control system must have the ability to identify the material on the sorting surface, taking into account external damage and ensuring the automatic removal of impurities. In this study, the highest sorting accuracy of tubers (of more than 91%) was achieved with a forward speed of 1.2 m/s for the conveyor of the sorting table, with damage to 2.2% of the tubers, which meets the agrotechnical requirements for post-harvest processing. This feature distinguishes the developed device from similar ones.

scholarly journals Biocoatings synthesized on magnesium alloy in system Ca3(PO4)2–CaSiO3 by micro-arc oxidation method

2021 ◽  
Vol 1954 (1) ◽  
pp. 012037
Author(s):  
M B Sedelnikova ◽  
A V Ugodchikova ◽  
T V Tolkacheva ◽  
Yu P Sharkeev ◽  
O V Kazmina ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Oxidation Method ◽  
Micro Arc Oxidation

Growth of aluminum-free porous oxide layers on titanium and its alloys Ti-6Al-4V and Ti-6Al-7Nb by micro-arc oxidation

2014 ◽  
Vol 41 ◽  
pp. 343-348 ◽  
Author(s):  
Laís T. Duarte ◽  
Claudemiro Bolfarini ◽  
Sonia R. Biaggio ◽  
Romeu C. Rocha-Filho ◽  
Pedro A.P. Nascente
Keyword(s):  
Oxide Layers ◽  
Micro Arc Oxidation ◽  
Porous Oxide

Controlled Synthesis, Mechanism and Degradation Property of Birnessite-MnO2 Nanoflowers and Nanoflakes

2021 ◽  
Vol 21 (9) ◽  
pp. 4846-4851
Author(s):  
Xin-Li Hao ◽  
Yue-Hong Song ◽  
Lin-Yi Li ◽  
Lu-Feng Li ◽  
Shuo-Shuo Chang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Optical Property ◽  
Controlled Synthesis ◽  
Synthesis Mechanism ◽  
Oxidation Method ◽  
X Ray ◽  
Aqueous Oxidation ◽  
Degradation Properties ◽  
Scanning Electron

Birnessite-MnO2 nanoflakes were synthesized via an aqueous oxidation method at 90 °C using Mn(CH3COO)2, NaOH, and KMnO4. The samples’ morphology, crystalline structure, and optical property were determined by field emission scanning electron microscopy, X-ray powder diffraction and UV-Vis spectrophotometry. The birnessite-MnO2 nanoflakes were converted to KxMn8O16 and Mn suboxides following a decrease in the concentration of KMnO4 in the reaction. The amount of NaOH in the reaction determined the type of precursor. Without NaOH, the precursor was converted from Mn(OH)2 to Mn2+ (from Mn(CH3COO)2), thereby enabling the synthesis of birnessite-MnO2 nanoflowers. The formation mechanism of birnessite-MnO2 nanoflowers and nanoflakes was clarified via the corresponding simulated crystal structures. Evaluation of the synthesized samples confirmed that the birnessite-MnO2 nanoflakes and nanoflowers exhibited excellent degradation properties.

Sign in / Sign up

Export Citation Format

Share Document