scholarly journals Actualities and Problems of Surface Finishing for Aluminum. Simultaneous Formation of Aluminum Oxide and Polypyrrole Layers by Anodic Oxidation.

1997 ◽  
Vol 48 (10) ◽  
pp. 990-993
Author(s):  
Katsuhiko NAOI ◽  
Masayuki TAKEDA
Keyword(s):  
Aluminum Oxide ◽  
Anodic Oxidation ◽  
Surface Finishing ◽  
Simultaneous Formation

Development of Aluminum Gate Thin-Film Transistors Based on Aluminum Oxide Insulators

1992 ◽  
Vol 284 ◽  
Author(s):  
Toshjhisa Tsukada
Keyword(s):  
Thin Film ◽  
Aluminum Oxide ◽  
Anodic Oxidation ◽  
Thin Film Transistors ◽  
Low Resistivity ◽  
Aluminum Metallization

ABSTRACTDevelopment of aluminum gate thin-film transistors (TFT) is described. This TFT is fabricated based on an aluminum oxide insulator technology, in which aluminum is anodically oxidized to form Al2O3. The use of aluminum is effective in reducing the delay of the gate busline of the display panels due to its low resistivity. The Al2O3 films formed by an anodic oxidation, block the growth of hillocks during TFT fabrication which is one of the biggest issues of aluminum metallization. With this technology it is possible to design and fabricate TFT/LCD panels larger than 30 inches and with more than 1000 scan lines.

scholarly journals Surface roughness of composite resins after finishing and polishing

2003 ◽  
Vol 14 (1) ◽  
pp. 37-41 ◽  
Author(s):  
Halim Nagem Filho ◽  
Maria Tereza Fortes Soares D'Azevedo ◽  
Haline Drumond Nagem ◽  
Fernanda Pátaro Marsola
Keyword(s):  
Surface Roughness ◽  
Aluminum Oxide ◽  
Statistical Difference ◽  
Composite Resins ◽  
Surface Finishing ◽  
Resin Composites ◽  
Average Surface Roughness ◽  
Average Roughness ◽  
Average Surface ◽  
Effect Of Surface

This study evaluated the effect of surface finishing methods on the average surface roughness of resin composites. Seven composites and two polishing systems were used. One hundred and twenty-six conical specimens of each material were prepared in stainless steel molds against a polyester strip. Forty-two of them remained intact and were used as controls. Each half of the remaining samples was polished with either diamond burs or diamond burs + aluminum oxide discs. The results showed no statistical difference in average surface roughness (Ra, µm) between the polyester strip and aluminum oxide discs (p>0.05). However, finishing with diamond burs showed a statistically higher average roughness for all composites (p<0.05). Statistical differences were detected among materials (p<0.05) in the use of diamond burs.

scholarly journals Surface Quality Evaluation of Various Metals After Grinding with Aluminum Oxide Grinding Wheel

2020 ◽  
Vol 9 (1) ◽  
pp. 25-31
Author(s):  
Rosemar Batista Da Silva ◽  
Giordano Francis Vieira ◽  
Letícia Cristina Silva ◽  
Carlos Alberto Damião ◽  
Rodrigo De Souza Ruzzi ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Cast Iron ◽  
Aluminum Oxide ◽  
Surface Quality ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Surface Finishing ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Machined Surfaces

Different metals can respond differently when grinding using the same abrasive grinding wheel, especially in terms of surface quality. In this context, this work aims give a contribution to the metalworking industry by presenting the results of surface finishing after grinding the following metals: VP Atlas steel grade, Gray Cast Iron and two superalloys, Inconel 718 and Ti-6Al-4V. Tests were performed with the aluminum oxide grinding wheel and with following parameters: cutting speed of 37.6 m/s and workspeed of 10 m/min. Two values of depth of cut (15 μm and 30 μm) were tested. The surface roughness (Ra and Rz parameters) were analyzed and SEM images of the machined surfaces were taken and analyzed in order to identify the cutting mechanisms and provide better results discussion. The results showed that the surface roughness increased with the depth of cut; Ra values kept below 0.48 μm for all metals tested. Regarding the machined surface quality, some cracks were observed on the gray cast iron and Ti-6Al-4V surfaces, thereby indicating their relative lower grindability compared to VP Atlas steel under the investigated conditions. No visual thermal damage was observed in the machined surfaces of the samples.

Fabricating Anodic Aluminum Oxide by Anodic-Oxidation

2011 ◽  
Vol 383-390 ◽  
pp. 5522-5525
Author(s):  
Ji Yan He ◽  
Jian Dan Ren ◽  
Yan Bin He
Keyword(s):  
Aluminum Oxide ◽  
Anodic Oxidation ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Pore Distribution ◽  
Aao Template ◽  
One Dimensional ◽  
Anodic Aluminum

Uniform parallel pores and controllable pore diameter make Anodic Aluminum Oxide (AAO) membrane one of the best materials in synthesis of one-dimensional nano-structured material. High orderly AAO template was prepared by anodic-oxidation. The prepared AAO membrane’s apertures ranged from 30 nm to 75 nm. Within a few microns, holes were orderly arranged. The fabricating methods of AAO template in different electrolyte were studied and the factors which affect the pore distribution, such as electrolyte types, voltage and concentration were discussed.

scholarly journals Catalytic Activity of Ni, Co, Mo Supported Anodic Aluminum Oxide Nanocomposites

2020 ◽  
Vol 15 (3) ◽  
pp. 845-852
Author(s):  
Anvar Xamidov ◽  
Farhodjon Hoshimov ◽  
Shavkat Mamatkulov ◽  
Khakimjan Butanov ◽  
Mirakhmat Yunusov ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Anodic Oxidation ◽  
Nanostructured Catalysts ◽  
Nickel Catalysts ◽  
Porous Aluminum ◽  
3D Metals ◽  
Nickel Cobalt ◽  
Molybdenum Nanoparticles ◽  
Porous Aluminum Oxide ◽  
Similar Yield

Nanostructured catalysts based on porous aluminum oxide (PAO) and some 3d metals, such as: nickel, cobalt, and molybdenum, have been obtained by anodic oxidation and impregnation. The synthesis of porous aluminum oxide with a highly ordered pore structure with pore sizes of 50 nm and a thickness of 50 µm is carried out by the method of two-stage anodic oxidation. The catalysts are obtained by impregnation of 3d metals into nanosized pores of aluminum oxide. The obtained catalysts based on nickel and porous Al2O3 are studied by scanning electron microscopy (SEM-EDX). The results of SEM-EDX analysis shows that a spongy structure with filament sizes of 100 nanometers containing particles of 3d metals formed on the surface of the aluminum oxide matrix. The results are presented on the activity of nickel and heterogenic cobalt and molybdenum nanoparticles in the reaction of hydrogenation of hexene to hexane. The results show that the yield temperature of the hexane is decreased and the yield of hexane is observed at 200 °C with Ni/Al2O3 catalysts, and a similar yield of hexane mass is achieved at temperatures higher than 250 °C with Co-Mo/Al2O3 and traditional nickel catalysts on kieselguhr. Copyright © 2020 BCREC Group. All rights reserved 

Preparation of Highly Ordered Anodic Aluminum Oxide Membranes with Wide-Range Tunable Pore Intervals in Mixed Electrolytes

NANO ◽  
2016 ◽  
Vol 11 (05) ◽  
pp. 1650051
Author(s):  
Yi Chang ◽  
Zhiyuan Ling
Keyword(s):  
Oxalic Acid ◽  
Phosphoric Acid ◽  
Aluminum Oxide ◽  
Anodic Oxidation ◽  
Anodic Aluminum Oxide ◽  
Ionization Constants ◽  
Mixed Electrolytes ◽  
Anodic Aluminum ◽  
Oxidation Current ◽  
Acid Radical

Highly ordered anodic aluminum oxide (AAO) membranes with pore interval from 100[Formula: see text]nm to 520[Formula: see text]nm were fabricated successfully in the mixed electrolytes, which are composed of 0.3[Formula: see text]M oxalic acid and 1[Formula: see text]wt.% phosphoric acid/0.01[Formula: see text]M aluminum oxalate. The study results show that oxalic acid volume percentage has an approximate linear relationship with the optimal anodic oxidation voltage. The optimal anodic oxidation voltage is basically equal to the critical oxidation voltage. The theoretical analysis suggests that the anodic oxidation current is closely related to the ionization constants of acid radical ion in the electrolyte. Since the secondary ionization constant of oxalic radical ion is greater than that of phosphoric acid radical ion, the optimal anodic oxidation voltage increases and the steady anodic oxidation current decreases with the decrease of oxalic acid volume percent.

scholarly journals Enhancement in sustained friction and wear resistance of nanoporous aluminum oxide films obtained by controlled electrochemical oxidation process

RSC Advances ◽  
2019 ◽  
Vol 9 (43) ◽  
pp. 25056-25063 ◽  
Author(s):  
Lidia Benea ◽  
Valentin Dumitrascu
Keyword(s):  
Wear Resistance ◽  
Aluminum Oxide ◽  
Electrochemical Oxidation ◽  
Anodic Oxidation ◽  
Friction And Wear ◽  
Oxidation Process ◽  
Oxide Films ◽  
Electrochemical Parameters ◽  
Anodic Oxidation Process

The primary purpose of this study is to investigate the effect of the electrochemical parameters required in the anodic oxidation process on the friction and wear resistance of the obtained nanoporous aluminum oxide films.

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