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Mostafa Seifan, Shaira Mendoza and Aydin Berenjian
In this study, the effects of micro-Al2O3 (MA) and nano-Al2O3 (NA) on the mechanical properties and durability performance of a mortar containing fly ash (FA) were investigated. In the first step, MA and NA were added to the mortar (as a cement replaceme...
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Abdulhamid Hamza,Alhaji Saleh Zanna Umara,Diya'uddeen Basheer Hasan
Pág. 68 - 75
Present work was aimed at the development of a-Al2O3 supported ZnFe2O4 visible-light responsive photocatalysts. ZnFe2O4 and a-Al2O3 supported ZnFe2O4 were synthesized using co-precipitation method followed by calcination at 500 °C. The synthesized photoc...
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Ying Yu, Yuxin Zuo, Zhonghao Zhang, Lei Wu, Chuanlong Ning and Chuncheng Zuo
The severe corrosion accompanied with hydrogen evolution reaction has become the main obstacle restricting the utilization of zinc as an electrode in alkaline batteries. Al2O3 coating helps control the corrosion of zinc in alkaline solution. Herein, a st...
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Valeria Subbotin?,Oleg S?b?l,Valery Belozerov,Alexander Subbotin,Yuliya Smyrnova
Pág. 14 - 23
The effect of electrolysis conditions with different electrolyte compositions on the growth kinetics, phase-structural state, and hardness of coatings obtained by microarc oxidation (MAO) on the D16 aluminum alloy (base ? aluminum, main impurity Cu) was ...
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Valeria Subbotin?,Oleg S?b?l,Valery Belozerov,Ubeidulla F. Al-Qawabeha,Taha A. Tabaza,Safwan Moh`d Al-Qawabah,Valentin Shnayder
Pág. 6 - 14
The influence of electrolysis conditions at different electrolyte compositions on the phase formation and properties of coatings obtained by microarc oxidation (MAO) on an aluminum alloy AMg6 was studied. For electrolysis, three types of electrolytes wer...
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He Guan and Shaoxi Wang
Au-Pt-Ti/high-k/n-InAlAs metal-oxide-semiconductor (MOS) capacitors with HfO2-Al2O3 laminated dielectric were fabricated. We found that a Schottky emission leakage mechanism dominates the low bias conditions and Fowler?Nordheim tunneling became the main ...
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Ville Matikainen, Kari Niemi, Heli Koivuluoto and Petri Vuoristo
Thermally-sprayed alumina based materials, e.g., alumina-titania (Al2O3-TiO2), are commonly applied as wear resistant coatings in industrial applications. Properties of the coatings depend on the spray process, powder morphology, and chemical composition...
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Yinghao Sun and Frank Cheng
Hydrogen embrittlement (HE) of steel pipelines in high-pressure gaseous environments is a potential threat to the pipeline integrity. The occurrence of gaseous HE is subjected to associative adsorption of hydrogen molecules (H2) at specific ?active sites...
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Zhixin Jia, Kaiyue Zhang and Jin Wang
Diamond wire sawing is one of the most widely used methods of cutting Al2O3 ceramic because it has good machining accuracy and causes less surface damage. However, its material removal rate (MRR) needs to be improved with the increasing demand for Al2O3 ...
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Aleksey V. Zhuzhgov, Lyubov A. Isupova, Evgeny A. Suprun and Aleksandr S. Gorkusha
This study revealed an increased reactivity of centrifugally thermoactivated products of gibbsite toward aqueous solutions of nickel nitrate at room temperature as well as under hydrothermal conditions. X-ray, thermal, microscopy, adsorption and chemical...
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Airingas ?uopys, Viktorija Grigaitiene, Liutauras Marcinauskas, Romualdas Ke?elis, Rolandas Uscila and Mindaugas Aikas
In this study, alumina coatings were formed using atmospheric plasma spraying, increasing the torch power from 29.4 to 45.1 kW. The surface morphology of the coatings was determined using scanning electron microscopy; the elemental composition was examin...
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Zeying Bao and Fulin Shang
The ideal mechanical shear properties and sliding characteristics of c-ZrO2(001)/a-Al2O3(11¯02" role="presentation">11_0211¯02
1
1
¯
02
) interfaces are examined through simulated shear deformations using first-principles calculations. We invest...
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Han Gao, Weimin Kong, Shuyuan Zhou, Xuwei Wang, Qingrong He and Yanchun Dong
Chemical warfare agents (CWAs) are highly toxic and fast-acting and are easy to cause large-scale poisoning to humans and livestock after being released. The activated carbon used for CWAs adsorption has disadvantages of limited adsorption capacity, easy...
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Gabriela Aristia, Le Quynh Hoa, Marianne Nofz, Regine Sojref and Ralph Bäßler
Al2O3 has been widely used as a coating in industrial applications due to its excellent chemical and thermal resistance. Considering high temperatures and aggressive mediums exist in geothermal systems, Al2O3 can be a potential coating candidate to prote...
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Aiming Bu, Yongfu Zhang, Yan Xiang, Yunjie Yang, Weiwei Chen, Huanwu Cheng and Lu Wang
This manuscript reported the synthesis of Al2O3 coating onto quartz fiber fabric by plasma electrolysis spray for enhanced thermal conductivity and stability. The nano- and micro-sized clusters were partially observed on the coating, while most coating w...
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Bruna Aparecida Rezende, Anderson Júnior dos Santos, Marcelo Araújo Câmara, Denilson José do Carmo, Manuel Houmard, Alessandro Roger Rodrigues and Juan Carlos Campos Rubio
In order to obtain better cutting tool performance, the coatings appear as an alternative in the machining process. The goal of the coating is to improve tribological conditions in the chip-tool and tool-workpiece interfaces. On the other hand, the use o...
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Muhammad Ali Abro and Dong Bok Lee
The 9Cr-1Mo steel (ASTM P91) was hot-dip aluminized, and its microstructural changes during oxidation were studied. Before oxidation, the coating consisted of (Al-rich topcoat containing a small amount of Al5Fe2 and Al13Fe4)/(Al13Fe4-rich, Al13Fe4-contai...
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Mohammad Mohsen Sarafraz, Faramarz Hormozi
Pág. 37 - 46
A large number of experiments have been performed to quantify the forced convective and nucleate flow boiling heat transfer coefficient of Al2O3 water based nanofluid. The employed test loop provides conditions to investigate the influence of operating p...
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M. M. Sarafraz, S. M. Peyghambarzadeh, S. A. Alavi Fazel, N. Vaeli
Pág. 71 - 77
Influence of Al2O3 nanoparticles on nucleate pool boiling heat transfer of diluted binary water-glycerol mixtures has been experimentally measured up to heat flux 91 kW/m2 at diluted volume fractions of 1% to 5% of glycerol into pure water at volumetric ...
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Hai-Chou Chang, Teng-Hui Wang and Christopher M. Burba
The interactions between 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([BMIM][TFS]) and nano-Al2O3 are studied using high-pressure infrared spectroscopy. The thickness of the [BMIM][TFS] interfacial layer on the aluminum oxide are adjusted by co...
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