Preparation of anodized aluminium oxide at high temperatures using low purity aluminium (Al6082)

2019 ◽  
Vol 378 ◽  
pp. 124970 ◽  
Author(s):  
A.E. Kozhukhova ◽  
S.P. du Preez ◽  
D.G. Bessarabov
Keyword(s):  
High Temperatures ◽  
Aluminium Oxide ◽  
Purity Aluminium

Effects of Pretreatment and the First Anodization Time on Morphology of Anodic Aluminium Oxide Templates

2011 ◽  
Vol 181-182 ◽  
pp. 707-711 ◽  
Author(s):  
Yu Cheng Wu ◽  
Jie Wu Cui ◽  
Yan Wang ◽  
Guang Qing Xu ◽  
Xin Yi Zhang
Keyword(s):  
Aluminium Oxide ◽  
Sem Images ◽  
Anodization Time ◽  
Effect Mechanism ◽  
Anodic Aluminium Oxide ◽  
Purity Aluminium ◽  
High Purity Aluminium ◽  
Aluminium Sheets ◽  
Anodization Method ◽  
Scanning Electron

Anodic aluminium oxide(AAO) templates were fabricated by a two-step anodization method utilizing high purity aluminium sheets. On the basis of getting the optimum preparation parameters of AAO templates, effects of the pretreatment and the first anodization time on morphology of AAO templates were studied. Field emission scanning electron microscope(FESEM) was used to investigate surface morphology of AAO templates. The SEM images indicated that both pretreatment and the first anodization time had a significant influence on morphology of AAO templates. Meanwhile,effect mechanism of pretreatment and the first anodization time on AAO templates morphology was elucidated.

scholarly journals Determination of trace impurities in high-purity aluminium oxide by acid pressure decomposition-ICP-AES.

1986 ◽  
Vol 35 (8) ◽  
pp. 636-640 ◽  
Author(s):  
Hisashi MORIKAWA ◽  
Yasuo IIDA ◽  
Toshio ISHIZUKA ◽  
Fumiaki YOKOTA
Keyword(s):  
High Purity ◽  
Aluminium Oxide ◽  
Trace Impurities ◽  
Purity Aluminium ◽  
High Purity Aluminium

scholarly journals Determination of trace impurities in high-purity aluminium oxide by spark source MS.

1986 ◽  
Vol 35 (8) ◽  
pp. 753-758 ◽  
Author(s):  
Masao SASAKI ◽  
Youichi UMADA ◽  
Hiromi WATANABE ◽  
Hiroshi UMEZAKI
Keyword(s):  
High Purity ◽  
Aluminium Oxide ◽  
Trace Impurities ◽  
Purity Aluminium ◽  
High Purity Aluminium

scholarly journals Effects of Quartz Glass Insulation on Platinum Gold Thermocouples

2019 ◽  
Vol 19 (5) ◽  
pp. 209-212
Author(s):  
Peter Pavlasek ◽  
Jan Rybař ◽  
Stanislav Ďuriš ◽  
Jakub Palenčar
Keyword(s):  
Quartz Glass ◽  
Freezing Point ◽  
Aluminium Oxide ◽  
Platinum Resistance ◽  
Insulation Material ◽  
Glass Insulation ◽  
Purity Aluminium ◽  
Platinum Resistance Thermometers ◽  
High Purity Aluminium ◽  
Freezing Point Of Silver

Abstract Au/Pt thermocouples are considered as an alternative to High Temperature Platinum Resistance Thermometers and are one of the prime candidates to replace them as the interpolating instrument of the International Temperature Scale of 1990 (ITS-90) in the temperature range between about 660 °C and 962 °C. This work presents the results of investigation of two Au/Pt thermocouples that used exclusively quartz glass (SiO2) as insulation material. Measurements in fixed points of Zn, Al, and Ag were realized on these thermocouples as well with interchanged inner insulation made of high purity aluminium oxide (Al2O3). The conducted experiments tested the performance of Au/Pt thermocouples with the use of different insulation materials. The measured electromotive forces were found to be sensitive to the replacement of the quartz glass by aluminium oxide as an insulation material of the Au/Pt thermocouples. This change of insulation has resulted in a temperature increase up to about 0.5 K measured at the freezing point of silver. The decreasing insulation resistance of quartz glass at higher temperatures is believed to be the source of thermoelectric instability.

scholarly journals The Crucial Role of the K+–Aluminium Oxide Interaction in K+‐Promoted Alumina‐ and Hydrotalcite‐Based Materials for CO2Sorption at High Temperatures

ChemSusChem ◽  
2008 ◽  
Vol 1 (7) ◽  
pp. 643-650 ◽  
Author(s):  
Stéphane Walspurger ◽  
Luciaan Boels ◽  
Paul D. Cobden ◽  
Gerard D. Elzinga ◽  
Wim G. Haije ◽  
...  
Keyword(s):  
High Temperatures ◽  
Crucial Role ◽  
Aluminium Oxide

In situ REM imaging of surface processes on ceramic bulk crystals from 300 to 1670 K in a conventional TEM

1991 ◽  
Vol 49 ◽  
pp. 660-661
Author(s):  
Z. L. Wang ◽  
J. Bentley
Keyword(s):  
High Temperatures ◽  
Image Resolution ◽  
Atomic Processes ◽  
Crystal Surfaces ◽  
Beam Radiation ◽  
Surface Areas ◽  
Transmission Electron ◽  
Reflection Electron Microscopy ◽  
Gas Reactions

Studying the behavior of surfaces at high temperatures is of great importance for understanding the properties of ceramics and associated surface-gas reactions. Atomic processes occurring on bulk crystal surfaces at high temperatures can be recorded by reflection electron microscopy (REM) in a conventional transmission electron microscope (TEM) with relatively high resolution, because REM is especially sensitive to atomic-height steps.Improved REM image resolution with a FEG: Cleaved surfaces of a-alumina (012) exhibit atomic flatness with steps of height about 5 Å, determined by reference to a screw (or near screw) dislocation with a presumed Burgers vector of b = (1/3)<012> (see Fig. 1). Steps of heights less than about 0.8 Å can be clearly resolved only with a field emission gun (FEG) (Fig. 2). The small steps are formed by the surface oscillating between the closely packed O and Al stacking layers. The bands of dark contrast (Fig. 2b) are the result of beam radiation damage to surface areas initially terminated with O ions.

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