Готові списки джерел за темами / Microarc oxidation

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Добірка наукової літератури з теми "Microarc oxidation"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Microarc oxidation"

Ma, Jie, Yuan Sheng Yang, Xiu Chun Wang, Jing Zhang, Shuo Liu, and Xi Bin Yi. "Effect of Impulse Voltage on Microstructure and Corrosion Resistance of Microarc Oxidation Coatings on AZ80 Magnesium Alloy." Key Engineering Materials 575-576 (September 2013): 418–22. http://dx.doi.org/10.4028/www.scientific.net/kem.575-576.418.

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Microarc oxidation coating and microarc oxidation-fluorocarbon coating were prepared on the surface of AZ80 magnesium alloy profiles. The phase structure, surface morphology and corrosion resistance of the coatings were investigated using SEM, XRD, copper sulfate spot test and polarization curve test. The main phase compositions of the microarc oxidation coatings were MgO, Mg2SiO4, MgSiO3, MgF2 and MgAl2O4. With increasing pulse voltage, the oxidation coating became thicker and the microstructure of the coating surface became compact; therefore the coating corrosion resistance was improved. The oxidation coating with pulse voltage of microarc oxidation controlled between 300-438V obtained the best corrosion resistance. The corrosion current density of magnesium alloy reduced 1-3 orders of magnitude after microarc oxidation treatment with increasing pulse voltage, and the corrosion resistance of microarc oxidation-fluorocarbon coating is desirable.

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Ma, Jie, Yuan Sheng Yang, Xiu Chun Wang, Jing Zhang, Shuo Liu, Li Kun Jiang, and Xi Bin Yi. "Microstructure and Corrosion Resistance of Microarc Oxidation Coatings on AZ31 Magnesium Alloy Extrusion Profiles." Advanced Materials Research 557-559 (July 2012): 1993–97. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.1993.

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Microarc oxidation coatings were prepared on the surface of AZ31 magnesium alloy profiles. Oxidation time of the coatings was between 5min-10min. The phase structure, surface morphology and corrosion resistance of the coatings were investigated using SEM, XRD, copper sulfate spot test and polarization curve test. The results indicate: the main phase compositions of the microarc oxidation coatings are MgO, Mg2SiO4 and MgSiO3; with increasing pulse voltage, the micropore diameter of the coating surface becomes larger, the micropore number reduces and the coating surface roughness increases; the corrosion current density of magnesium alloy reduces significantly after microarc oxidation treatment. The pulse voltage of microarc oxidation should be controlled between 240V-360V to obtain the best corrosion resistance.

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Peng, Guang Huai, Bao Jun Han, Ling Fang, Xue Feng Guo, and Xiao Lian Zhang. "Effect of Negative Pulse Voltage on the Microstructure and Corrosion Resistance of Microarc Oxidation Film of A356 Aluminum Alloy." Materials Science Forum 675-677 (February 2011): 1193–96. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.1193.

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The effect of negative pulse voltage on the microstructure and corrosion resistance of microarc oxidation film of A356 aluminum alloy treated by microarc technique was investigated by SEM, coating thickness gauge and electrochemical workstation etc. The results show the negative pulse voltage greatly influences the microstructure and corrosion resistance of microarc oxidation film by its electrode reaction. The film thickness increases while the size of pore and roughness of the film surface decreases initially and then increases with negative pulse voltage increasing. The microarc oxidation treatment considerably improved corrosion resistance, and the highest corrosion potential was -1.16V, which was 0.38V higher than that of substrate, and the corrosion current was lower than that of substrate about three orders of magnitude.

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Rakoch, A. G., and I. V. Bardin. "Microarc oxidation of light alloys." Metallurgist 54, no. 5-6 (September 2010): 378–83. http://dx.doi.org/10.1007/s11015-010-9309-y.

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Kuleshkov, Yuriy, Mykhailo Krasota, Timofey Rudenko, Ruslan Osin, and V. Kroshka. "Strengthening of Aluminum Alloy Parts by Micro-Arc Oxidation." Central Ukrainian Scientific Bulletin. Technical Sciences, no. 4(35) (2021): 44–53. http://dx.doi.org/10.32515/2664-262x.2021.4(35).44-53.

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The purpose of the research is to analyze the scientific and technical information to determine the possibility of strengthening the parts of aluminum alloys by microarc oxidation, in particular gear pump housings. The article presents the results of the analysis of possibility of using a new method of hardening roboczych surfaces - micro-arc oxidation to enhance the wear resistance of working surfaces of parts made of aluminum alloys, in particular housings, gear pumps NSH. The paper describes the essence of the process of hardening parts by microarc oxidation, presents the main physical and mechanical characteristics of the hardening coating. It is noted that the adhesion strength and mechanical properties of the coating largely depend on the state of the surface to be strengthened, in particular, on the method of pretreatment. At the same time, it was found that the strengthening coating of the metal after plastic deformation has a greater adhesion strength, greater thickness and hardness. The paper presents the basic information about microarc oxidation, which, according to the authors, will contribute to the development of the method in the poorly studied method of hardening in repair production. It can be concluded that the ceramic coatings obtained by microarc oxidation can be recommended for the restoration and strengthening of aluminum parts of gear pumps, in particular the pump housing.

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Liu, Wan Hui, Ai Lian Bao, Xin Yu Mao, and Guang Hai Zheng. "Microstructure and Properties of Microarc Oxidation Ceramic Coatings on Aluminum Alloy." Key Engineering Materials 353-358 (September 2007): 1895–98. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1895.

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The paper discusses structure and property aspects of oxide films formed on 7075 aluminum alloys by microarc oxidation in alkali-silicate electrolytic solution. Microstructure, surface morphology and phase composition of the ceramic coatings were investigated by SEM and XRD. Distribution of hardness along the coating thickness was determined by microhardness analyses. The friction and wear behavior of the oxide films against steel counterparts was evaluated with a friction and wear tester. The results showed that the microarc oxidation coatings composed mainly of α-Al2O3 and γ-Al2O3 phase are dense and uniform, which indicates that the wear resistance of Al alloy could be improved obviously by microarc oxidation. The films possess a beneficial combination of 25~45 μm thickness, HV0.11500 microhardness and provide a low wear rate but a relatively high friction coefficient against GCr15 steel under dry friction condition.

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Malyshev, V. N., A. M. Volkhin, and B. M. Gantimirov. "Tribological Characteristics Improvement of Wear Resistant MAO-Coatings." Journal of Coatings 2013 (June 19, 2013): 1–5. http://dx.doi.org/10.1155/2013/262310.

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Currently, the most promising technology of coating formation is microarc oxidation (MAO) with unique properties of the surface layer, which combine high wear resistance, corrosion resistance, and heat and erosion resistance. Microarc oxidation can be used for parts and components manufacturing in various segments of industries. However, the technology improvement by improving the tribological characteristics of MAO-coatings can not only enhance economic effect, but also expand its application.

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WANG, Y. M., B. L. JIANG, L. X. GUO, and T. Q. LEI. "ANTIFRICTION PROPERTY OF MICROARC OXIDATION COATING ON TITANIUM ALLOY UNDER SOLID LUBRICATING SLIDING CONDITION." Surface Review and Letters 11, no. 04n05 (August 2004): 367–72. http://dx.doi.org/10.1142/s0218625x04006360.

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Ceramic coatings were fabricated on Ti6Al4V alloy surface by microarc oxidation (MAO) in Na 2 SiO 3–( NaPO 3)6– NaAlO 2 solution using an AC power supply. Microstructure and phase composition of coating were characterized by SEM and XRD, respectively. The antifriction property of the coating with and without solid lubricant sliding against SAE 52100 steel ball was investigated on a pin-on-disk friction and wear tester. The results show that the microarc oxidation coating is relatively dense and uniform, mainly composed of rutile and anatase. The coating sliding against the steel has friction coefficient as low as 0.2–0.3 at an applied load of 0.5 N and sliding cycle below 2500, which is much smaller than that of uncoated Ti6Al4V against the same counterpart. The transferring of materials from the softer steel ball onto the coating surface is the main wear event, while the microarc oxidation coating is characterized by slight abrasive wear and adhesive wear. Introducing solid graphite lubricant into the porous surface of microarc oxidation coating significantly improves the long-term antifriction property (registering friction efficient of 0.15 in the long-term sliding) under a similar sliding condition. This improvement is attributed to the reduction of materials that are transferred from the softer steel ball onto the coating surface.

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Khokhlov, A., D. Maryin, D. Molochnikov, A. Khokhlov, I. Gayaziev, and O. Smirnova. "Influence of the thickness and porosity of the oxide coating on the piston heads depending on the parameters of the microarc oxidation mode." Journal of Physics: Conference Series 2131, no. 4 (December 1, 2021): 042046. http://dx.doi.org/10.1088/1742-6596/2131/4/042046.

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Abstract This paper discusses the process of formation of an oxide coating (hardening and heat-insulating coating) on the working surfaces of the head (top and piston grooves) of the piston by the method of microarc oxidation (MAO). In the process of oxidation of the piston head, the operating parameters of MAO will have a significant effect on the thickness and porosity of a formed oxide coating. The paper presents the theoretical relationships between the electrical parameters of the microarc oxidation mode and the thickness and porosity of the oxide coating. The thickness of the formed oxide coating on the piston heads will depend on the applied voltage and the composition of the electrolyte used. The porosity of the formed oxide coating will depend on the parameters of the current strength and the applied voltage. It is theoretically established that the formation of an oxide coating of a certain thickness and porosity occurs due to changes in the current strength, voltage and time of microarc oxidation.

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Lu, Chuang, Fa Qin Xie, and Li Ping Zhu. "Microstructure and Tribological Properties of Microarc Oxidation Coatings on Al-Si Alloy." Key Engineering Materials 703 (August 2016): 112–18. http://dx.doi.org/10.4028/www.scientific.net/kem.703.112.

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Microarc oxidation(MAO) was used to prepare the coatings on the surface of Al-Si alloy. Besides, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) were utilized to research the microstructure characteristics, the components distribution, and the phase compositions, for the microarc oxidation coatings on Al-Si alloys. Furthermore, the growth process and wear properties of the coatings were explored. Results indicated that:the phase compositions of microarc oxidized coating consisted of mullite (3Al2O3·2SiO2), α- Al2O3 and γ- Al2O3. With the increase of load, the friction coefficient of the coating decreased, however it was greater than that of Al-Si alloy substrate. The wear resistance of the coating were one time higher than that of the substrate.

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Більше джерел

Дисертації з теми "Microarc oxidation"

Смирнова, Олександра Юріївна. "Удосконалення технології формування оксидних шарів на сплаві титану ОТ4–0". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21923.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.17.03 – технічна електрохімія. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2016 р. Дисертація присвячена удосконаленню технології оксидування сплаву титану ОТ4–0 для створення матеріалів з протикорозійними та каталітичними властивостями. Обґрунтовано склад електролітів і експериментально визначено вплив режимів оксидування на склад, морфологію та властивості оксидних покриттів. Розроблено технологію мікродугового оксидування сплаву титану ОТ4–0 для одержання оксидних композицій Ti/TiOx∙CeOy, Ti/TiOx∙CeOy∙ZrOz, Ti/TiOx∙CeOy∙ZrOz∙CuOn. Експериментально встановлено, що церійвмісні оксидні шари виявляють високу каталітичну активність у реакціях окиснення бензолу та конверсії СО, а введення іонів міді та цирконію у церійвмісні МДО- покриття знижує температуру конверсії СО. Запропоновано склади електролітів для формування цирконій- та молібденвмісних оксидних покриттів із підвищеною термостійкістю. Визначено корозійну стійкість синтезованих матеріалів та їх каталітичну активність в модельній реакції конверсії монооксиду карбону та бензолу.
Thesis for granting the Degree of Candidate of Technical sciences in speciality 05.17.03 – Technical Electrochemistry. – National Technical University "Kharkiv Politechnical Institute", 2016. The thesis is dedicated to improvement of titanium alloy ОТ4–0 oxidizing technology for the creation of materials with anticorrosive and catalytic properties. The electrolytes composition and oxidation mode influence on the oxide coating composition, morphology and properties was established. The technology of titanium alloy ОТ4–0 microarc oxidation, the oxide composition Ti/TiOx∙CeOy, Ti/TiOx∙CeOy∙ZrOz, Ti/TiOx∙CeOy∙ZrOz∙CuOn synthesis was developed. The cerium-containing oxide layers show high catalytic activity in oxidation benzene and monoxide carbon; insertion cuprum and zirconium ions in cerium-containing oxide layers decrease monoxide carbon conversion temperature experimentally established. The electrolytes composition for zirconium- and molybdenum-containing thermostable oxide coatings synthesis is proposed. The synthesized materials corrosion resistance and catalytic activity in the model reaction of carbon monoxide conversion were determined.

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Batista, Luciana. "MicroRNAs and oxidative stress : mechanisms of regulation and impact on tumorigenesis." Paris 7, 2013. http://www.theses.fr/2013PA077168.

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Les microARNs (miRNAs) sont des régulateurs majeurs de l'expression génique et ont été impliqués dans un grand nombre de processus biologiques et pathologies, dont le cancer. Le stress oxydant est une accumulation des espèces réactives de l'oxygène et génère une réponse cellulaire dans laquelle le miRNAs peuvent jouer un rôle important. Dans cette étude nous nous intéressons au rôle et à la régulation des miRNAs de la famille miR-200 (miR-141, 200a, 200b, 200c and 429) qui accumulent en réponse au stress oxydant. Dans la première partie, nous invetiguons la fonction de miR-141 et 200a dans la tumorigénèse et la réponse au stress oxydant. Nous montrons que ces miRNAs ciblent une protéine clé de cette réponse, la p38alpha. Ils sont pro-tumorigènes mais leur surexpression augmentent la sensibilité à la chimiothrapie. Dans les tumeurs ovariennes humaines, l'expression du miR-200a est associée à une signature de Stress oxydant, ce qui corrèle avec une meilleure survie des patientes. La deuxième partie est dédiée à l'étude de deux miRNAs issus d'un même locus génomique, miR-200c et 141. Nous démontrons que leur transcription est associée à celle du gène localisé en amont, PTPN6. Nous proposons deux mécanismes originaux de co-régulation de ces gènes. Le premier est que la transcription de PTPN6 ne s'arrête pas à son site de polyadénylation, mais continue jusqu'aux miRNAs. Le deuxième mécanisme est l'association physique entre les deux promoteurs à travers une boucle de l'ADN, mis en évidence par des expériences de 3C (Chromosome Conformation Capture)
MicroRNAs (miRNAs) are key regulators of gene expression and habe been implicated in a vast number of biological processes and pathologies, including cancer. Oxidative stress is generated by an accumulation of reactive oxygen species and elicits a cellular response in which miRNAs can play an important role. By investigating miRNAs affected by oxidative stress, we identified the miR-200 family of miRNAs (miR-141, 200a, 200b, 200c and 429) and studied their function and regulation. In the first part, we investigated the miR-141 and 200a function in oxidative stress response and their impact on tumorigenesis. We showed that they directly target a key stress sensor, the p38alpha. These miRNAs are pro-tumorigenic but their overexpression in xenografted tumors lead to an increased sensitivity to paclitaxel chemotherapy. In an human ovarian cancers, miR-200a expression is associated with an Oxidative Stress signature, which correlates with a better clinical outcome. These findings have potential future clinical applications in prediction and treatment of ovarian cancer. The second part is focused on two genetically clustered miRNAs, miR-200c and 141, which are co-upregulated upon oxidative stress. We demonstrated that their transcription is intimately associated to this one of the upstream gene, PTPN6. We propose two original mechanisms for the tight co-regulation of these genes. The first is a transcriptional read-through of the PTPN6 polyadenylation site leading to the transcription of the downstream miRNAs. The second mechanism, supported by our 3C (Chromosome Conformation Capture) experiments, is a physical interaction between the two promoters by a DNA-loop

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Heliot, Amélie. "Étude de la réponse cellulaire et des Vésicules Extracellulaires produites par des macrophages primaires exposés aux particules fines (PM₂.₅)." Thesis, Littoral, 2018. http://www.theses.fr/2018DUNK0522.

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La pollution atmosphérique est un problème de santé publique. En 2013, le Centre International de Recherche sur le Cancer a classé la pollution de l'air, ainsi que les particules fines (PM₂.₅), de taille inférieure à 2,5 µm, comme cancérogène de groupe I pour l'homme. Les PM₂.₅ ont la capacité de pénétrer en profondeur dans l'appareil respiratoire. En se déposant au niveau des alvéoles pulmonaires, elles entraînent une réponse inflammatoire importante notamment via la libération de médiateurs de l'inflammation et des vésicules extracellulaires (EV) par les cellules immunitaires infiltrantes ou résidentes. Dans ce contexte, ce projet de thèse comportait deux objectifs majeurs : i) déterminer les caractéristiques chimiques des PM₂.₅ collectées en milieu industrialo-urbain, en identifier les origines et la variabilité saisonnière de leur composition chimique ; ii) étudier la réponse et les EV produites par les macrophages suite à l'exposition aux PM₂.₅ et observer les effets des EV sur les cellules pulmonaires.Pour cela, des macrophages primaires ont été exposés aux PM₂.₅ prélevées à Dunkerque et leur réponse cellulaire (stress oxydant, inflammation, polarisation, miARN) a été mesurée. Les EV produites en réponse à cette exposition ont été isolées et caractérisées. Enfin, des cellules épithéliales pulmonaires, les BEAS-2B, ont été exposées aux EV libérées en réponse à l'exposition aux PM₂.₅ et les effets de cette exposition (inflammatoire, stress oxydant, miARN) ont été mesurés. Nous avons mis en évidence une inflammation et une réponse anti-oxydante dans les macrophages, ainsi qu'une modification de leur polarisation. Les PM₂.₅ entrainent une libération plus importante d'EV
Air pollution is a major public health problem. In 2013, The International Agency for Research on Cancer classified air pollution and fine particle (PM₂.₅), with size lower than 2.5 µm, as carcinogenic to humans (group I). PM₂.₅ are able to penetrate deeply in lungs. When PM₂.₅ settle in pulmonary alveolar, they lead to strong inflammatory response, with inflammatory mediators ans extracellular vesicles release by infiltrating or resident immune cells. In this context, this thesis included two major aims : i) evaluate the physico-chemical characteristics of PM₂.₅ sampled in an industrial-urban site, identify their origin and study the seasonal variability of their composition ; ii) investigate the cellular response and EV produced by macrophages in response to PM₂.₅ and study EV's effects on epithelial cells. To achieve this, macrophages are exposed to PM₂.₅ collected in Dunkerque, and cellular response (oxidative stress, inflammation, polarization, miRNA) was quantified. EV released in response to PM₂.₅ exposition was isolated and characterized. Finally, epithelial cells, BEAS-2B, are exposed to EV released by exposed and non exposed macrophages to evaluate effects from this exposure (inflammation, oxidative stress, miRNA). We observed inflammation and anti-oxidant response in macrophages after PM₂.₅ exposure, as well as polarization modification. PM₂.₅ lead to increased number of EV by macrophages

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Liu, Shih-Jui, and 劉時瑞. "The Effect of Additives on Microstructure of Microarc Oxidation Films on Aluminum Alloys." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/90461207744568171741.

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碩士
中華大學
機械工程學系碩士班
100
Microarc oxidation (MAO) is an electrochemical surface treatment process for generating oxide coatings on metals. It involves the modification of a conventional anodically grown oxide film by the application of an electric field greater than the dielectric breakdown field for the oxide. This process has been widely used to grow thick oxide layer on aluminum which can offer protection against wear and corrosion. This study investigates the effects of adding graphite and nano-diamond powders into the electrolyte solution on structure and thermal properties of grown aluminum oxides by MAO process. The 6061 aluminum alloy was used as the substrate material and pulsed DC power supply was utilized to grow oxide layer. The results show that Al4C3, Al4O4C and Al2O3 are the main phases in grown layer when graphite particles are added into the electrolyte solution. The addition of graphite particles into the electrolyte solution significantly increases the thermal emissivity and hence decreases the heat spreading resistance of the grown layers. In the case of using nano-diamond particles as the additives, only diamond, Al2OC and Al2O3 phases are observed in the grown layer. The measured heat spreading resistance decreased obviously, which can be attributed to the high thermal conductivity of diamond particles trapped inside the coatings.

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Tsai, Hun-Hui, and 蔡弘輝. "Effect of electrolytic solution with different ceramic particles by microarc oxidation on aluminum alloy." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/21997162280506729992.

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碩士
龍華科技大學
工程技術研究所
97
Aiuminum alloy has been widely used in the industry because the characteristic of light mass and easy manufacturing for complicated components. Byuse of micro-arc oxidation (MAO) method, producing an oxidized ceramics coating on the surface of aluminum alloy substrate can enhance the hardness and corrosion resistance of the surface. This study aims to improve the substrate’s properties further by adding insoluble particle in the electrolyte separately. The results of hardness and corrosion resistance of the ceramic coating both show that the addition of AlO3 particles is superior to that of TiO2,or SiC and the hardnwss of the ceramic coating may reach to 1248 Hv. Add SiC particles has the best of the corrosion resistance. The particles can be added to decrease the roughness of ceramic coatings.

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Tsai, Wei-ting, and 蔡維庭. "Fabrication of Hydroxyapatite on the Microarc Oxidation Ceramic Coating of Titanium and its Alloy." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/20091608509132390809.

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Анотація:

碩士
龍華科技大學
工程技術研究所
99
With different methods, this study aims to fabricate hydroxyapatite on the titanium and its alloy surface by use of microarc oxidation treatment. The paper is composed of two parts. The first part is that RF magnetron sputtering technology and self-made targets were used to produce hydroxylapatite covering the surface of titanium and its alloy. The second part is that a coating containing rich calcium and phosphorus composition was formed on the surface of titanium and its alloy by means of Ca2+, PO43-ions added in the electrolyte; and then, the surface was treated with a hydrothermal method in order to obtain rich content of hydroxylapatite. The study also aims to prepare the titanium and its alloy with better corrosion resistance, hydrophilic property and biologically active structure. The corrosion resistance of oxide coating was analyzed by Electrochemical Impedance Spectroscopy (EIS). Hydrophilic property was investigated by water contact angle. Furthermore, the morphology, microstructure, chemical composition and phase structures of coating were studied by FSEM-EDS and XRD. Surface roughness and thickness were examined by micro-shape analyzer (α-step) analysis. In addition, the MTT assay was used to explore the cell proliferation rate. The first part of the study shows that the surface made from the RF magnetron sputtering treatment has amorphous hydroxyapatite structure. Moreover, its cell proliferation is worse than that of the secondary part; however, it is still superior to the surface of substrate. More importantly, the surface obtained from the second part appears better hydrophilic property, richer calcium and phosphorus content, favored surface roughness and higher cell proliferation.

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Huang, Wan-ting, and 黃婉婷. "Electroless copper with sodium hypophosphiteas as reductant on the surface of microarc oxidation coating." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/49362710918917328516.

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Анотація:

碩士
龍華科技大學
工程技術研究所
100
This study proposes the micro-arc oxidation and electroless copper plating two methods, the formation of a new process - micro-arc oxidation of direct copper plating process (Micro-the arc Oxidation Direct Plate Copper MAODPC) to improve the thermal resistance of the LED radiating ceramic substrate. The results of this technique can be applied to the ceramic printed circuit boards, multi-chip packaging,microelectronics and precision machinery manufacturing industry, and even anti-electromagnetic interference (EMI), so the implementation of this plan can expand the application fields of micro-arc oxidation film.technology to upgrade traditional industries, increase competitiveness and foreign. This study is divided into two parts: the first part of the current density 2、4、6、8、10 A/dm2 micro-arc oxidation, and then use the best conditions for the micro-arc oxidation ceramic layers of Electroless Copper Plating. The second part to replace commonly used in the past industrial formaldehyde as a reducing agent, the Taguchi method (hereinafter referred to as the Taguchi method) to change the operating conditions of temperature, time, copper sulfate concentration and pH of the electroless copper plating using sodium hypophosphite. The first part of the study results show that the know: According to the micro-arc oxidation film thickness, roughness and micro-arc oxidation surface electroless copper plating thickness to select current density 4A/dm2, electroless copper plating was better. The second part of the study results show that: at 85°C, CuSO4‧5H2O 6g / L, 60min, pH5 - conditions, the availability of thick copper film 22μm, and the measured resistance value of 5.8 × 10-4Ω‧cm. The results of the study to overcome the micro-arc ceramic layer resistive and ceramic layer and the copper bonding problems, the successful preparation of the three-layer structure of aluminum alloy - ceramic - metal copper.

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XU, ZHU-MIN, and 許筑旻. "Corrosion Behavior of AZ31B Pulse Microarc Oxidation and Effect of Magnesium Ion Release on Cells." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/tpjv8k.

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Анотація:

碩士
大葉大學
醫療器材設計與材料碩士學位學程
107
Magnesium is one of the essential elements in the human body. Magnesium alloy has good biocompatibility and degradability, and has the potential to become a temporary orthopedic implant material, providing temporary mechanical support for wound or diseased tissue healing. However, magnesium alloy implants have the problem of excessive corrosion in the human body. Therefore, in order to reduce the corrosion rate of magnesium alloy in the human body and explore the factors and biocompatibility of magnesium alloy degradation, and avoid complete degradation before the repair of the implant site. Surface treatment technology is considered to be the main improvement direction of magnesium alloys. 　　In order to improve the degradation rate of AZ31B magnesium alloy in human plasma, this study used Micro-Arc Oxidation (MAO) to improve corrosion resistance. The electrolyte was prepared by using citrate, sodium hydroxide and sodium citrate. The micro-arc oxidation treatment is performed by adjusting the time by a direct current pulse method. The experimental results show that AZ31B magnesium alloy is treated by micro-arc oxidation (MAO-AZ31B), analyzed by corrosion polarization curve of Simulated Body Fluid (SBF), and AZ31B micro-arc oxidation for 30 min has the best corrosion resistance. MAO-AZ31B was immersed in SBF for 7 days, from Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM) and X-ray photoelectron spectroscopy (XPS). Cross-alignment shows that SBF will degrade from the surface pores and cracks into the micro-arc oxidation layer, so that the pores of the porous layer are filled with Apatite, and a layer of Apatite deposit covers the MAO-AZ31B, according to In the depth analysis of atomic concentration, there was no significant difference in Ca2p and P2p between MAO-AZ31B and SBF solution for 1 day and 7 days. It was considered that there was a certain thickness of Apatite deposit for 1 day. Survival of Neuro2a mouse neuroblastoma cells with different numbers of AZ31B test strips for 48 hours showed significant inhibition of cell growth and death.

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Tseng, Kuo-Hang, and 曾國輝. "The study of ceramic coatings on aluminum alloy fabricated by DC microarc oxidation (MAO) technology." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/54698966941529063266.

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Анотація:

碩士
龍華科技大學
工程技術研究所
95
Aluminum alloy has been widely used in the industry because the characteristic of light mass and easy manufacturing for complicated components. By use of microarc oxidation (MAO) method, this study produces an oxidized ceramics coating on the surface of aluminum alloy substrate. The objective aims to enhance the hardness and corrosion resistance of the aluminum alloy substrate. This study divides into theoretical and applicable parts: the theoretical results indicate that the α-Al2O3 content and hardness of the ceramic coating are increase with the current density. The results of AC impedance method and polarization curve both show that the corrosion resistance of the ceramic coating is superior to the substrate at different current density and the corrosion rate may be retarded to three orders or more. The applied results indicate the optimal operational condition by use of Taguchi experimental plan: sodium tungstate concentration 8g/L, TiO2 0.5g/L, current density 7A/dm2 and reaction time 60min. Furthermore, the optimal hardness of the ceramic coating may reach to 1380 Hv.

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Книги з теми "Microarc oxidation"

author, Fang Zhigang, and Jiang Bailing author, eds. Wei hu yang hua ji shu ji qi zai hai yang huan jing zhong de ying yong: Microarc oxidation technology and its applications in sea environments. Beijing: Guo fang gong ye chu ban she, 2010.

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Частини книг з теми "Microarc oxidation"

Liu, Wan Hui, Ai Lian Bao, Xin Yu Mao, and Guang Hai Zheng. "Microstructure and Properties of Microarc Oxidation Ceramic Coatings on Aluminum Alloy." In Key Engineering Materials, 1895–98. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.1895.

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Xue, Wen Bin, Xiao Ling Wu, Jian Cheng Du, Xi Jin Li, and Hua Tian. "Structure and Properties of Microarc Oxidation Films on Zinc-Containing Aluminum Alloy." In Materials Science Forum, 1145–48. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.1145.

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Zhao, Hui, Ji Chen, and Zhen Liu. "Microstructure and Mechanical Properties of Ceramic Coating on AM50 Magnesium Alloy by Microarc Oxidation." In Materials Science Forum, 693–96. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-968-7.693.

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Wang, Ya Ming, Ting Quan Lei, De Chang Jia, Yu Zhou, and Jia Hu Ouyang. "Microstructure and Dry Sliding Tribological Behavior of Microarc Oxidation Coating Formed on Ti6Al4V against Steel." In Key Engineering Materials, 1734–36. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.1734.

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Li, Xi Jin, Wen Bin Xue, Xiao Ling Wu, Guo An Cheng, and Rui Ting Zheng. "Microarc Oxidation Coatings Fabricated on Ti₃Al-Based Alloy in Silicate Electrolyte." In Materials Science Forum, 1769–72. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.1769.

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Yuan, Quan, Zhen Tan, Ping Gong, Rong Rong Nie, Xiao Yu Li, Li Ru Shen, Yu Ban, et al. "The Effect of Microarc Oxidation Ceramic Coating on Sensory Reconstruction around Implants Using Cultured Schwann Cells." In Advanced Biomaterials VII, 697–700. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-436-7.697.

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Chen, Fei, Hai Zhou, Chen Chen, Fan Xiu Lu, and Fan Xiu Lu. "Study On the Corrosion Resistance Properties of the Ceramic Coating Obtained Through Microarc Oxidation on the Aluminium Alloy Surface." In Key Engineering Materials, 1733–36. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.1733.

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Wu, Kun, Y. Q. Wang, and Ming Yi Zheng. "Growth and Microstructure of Microarc Oxidation Coating on Al₁₈B₄w/AZ91 Mg Matrix Composite." In Materials Science Forum, 543–46. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.543.

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Wang, Y. Q., Ming Yi Zheng, and Kun Wu. "Characterization of Wear and Corrosion Protective Coatings Formed on AZ91 Magnesium Alloy and SiCw/AZ91 Magnesium Matrix Composite by Microarc Oxidation." In Materials Science Forum, 823–26. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-968-7.823.

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Bashkov, Oleg V., Fegnuan Bao, Xuewei Li, and Tatiana I. Bashkova. "Investigation of the Influence of Electrical Modes on the Morphology and Properties of Oxide Coatings on Aluminum Alloy 1163, Obtained by the Microarc Oxidation." In Current Problems and Ways of Industry Development: Equipment and Technologies, 87–95. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69421-0_10.

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Тези доповідей конференцій з теми "Microarc oxidation"

Yue Li, Hanhua Wu, Jiafu Wang, Genyu Chen, and Songnan Yu. "Microarc oxidation power supply based on automatically control." In 2011 3rd International Conference on Advanced Computer Control (ICACC). IEEE, 2011. http://dx.doi.org/10.1109/icacc.2011.6016371.

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Li, Song, Jingshan Jiao, Lei Ming, Jixin Yin, and Xiujuan Liu. "Corrosion resistance properties of microarc oxidation coatings on magnesium alloys." In 2012 2nd International Conference on Applied Robotics for the Power Industry (CARPI 2012). IEEE, 2012. http://dx.doi.org/10.1109/carpi.2012.6356304.

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Zhongcai, Shao, Jiang Haitao, Wei Shouqian, Li Xiaodan, and Zhai Yuchun. "Photocatalytic properties of TiO2 thin films prepared by microarc oxidation." In 2011 International Conference on Consumer Electronics, Communications and Networks (CECNet). IEEE, 2011. http://dx.doi.org/10.1109/cecnet.2011.5768415.

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Golubkov, P. E., E. A. Pecherskaya, I. I. Kochegarov, M. I. Safronov, and J. V. Shepeleva. "Simulation of Microarc Oxidation Process Based on Equivalent Electric Circuit." In 2019 XXII International Conference on Soft Computing and Measurements (SCM). IEEE, 2019. http://dx.doi.org/10.1109/scm.2019.8903897.

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Novikov, V. V., O. O. Novikova, and A. N. Bolotov. "Formation of diamond-containing ceramic abrasive material by microarc oxidation." In PROCEEDINGS INTERNATIONAL CONFERENCE “PROBLEMS OF APPLIED MECHANICS”. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0047434.

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Komarova, E. G., M. B. Sedelnikova, Y. P. Sharkeev, M. V. Chaikina, and E. A. Kazanceva. "Lanthanum- and silicon-incorporated calcium phosphate coatings formed by microarc oxidation." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2017 (AMHS’17). Author(s), 2017. http://dx.doi.org/10.1063/1.5013768.

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Wanhui Liu, Wenbin Liu, and Ailian Bao. "Structure and properties of ceramic coatings formed on 7N01 alloys by microarc oxidation." In 2011 6th International Forum on Strategic Technology (IFOST). IEEE, 2011. http://dx.doi.org/10.1109/ifost.2011.6021003.

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Zhao Yufeng, Yang Shiyan, and Yang Wei. "Design of microarc oxidation supply and study of switching losses and positive snubber." In 2008 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). IEEE, 2008. http://dx.doi.org/10.1109/speedham.2008.4581192.

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Shutao Huang and Li Zhou. "Structure and properties of ceramic coating on Al alloy by plasma microarc oxidation." In 2010 International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2010. http://dx.doi.org/10.1109/mace.2010.5535689.

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Sharkeev, Yu P., M. B. Sedelnikova, E. G. Komarova, and I. A. Khlusov. "Titanium surface modification by microarc oxidation in electrolyte based on wollastonite and hydroxyapatite." In NEW OPERATIONAL TECHNOLOGIES (NEWOT’2015): Proceedings of the 5th International Scientific Conference «New Operational Technologies». AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4936053.

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