• Title, Summary, Keyword: Aluminium

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I-V characteristics of ground electrode fabricated using an aluminium scrap (알루미늄 스크랩을 이용하여 제작한 접지 전극의 전압-전류 특성)

  • 이우선;정용호;박진성
    • Electrical & Electronic Materials
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    • v.9 no.8
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    • pp.806-812
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    • 1996
  • I-V characteristics of ground electrode fabricated using an aluminium scrap are presented. We fabricated several shapes of aluminium scraps and aluminium electrodes. The results show that the current of aluminium electrode increased linearly by the voltage increase. AC breakdown voltage of copper plate electrode was higher than that of aluminium electrode. AC breakdown current of aluminium electrode was higher than that of copper plate electrode. As applied voltage increased, grounding resistance of aluminum electrode decreased linearly.

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Synthesis and characterization of sugarcane bagasse/zinc aluminium and apple peel/zinc aluminium biocomposites: Application for removal of reactive and acid dyes

  • Safa, Yusra;Tariq, Saadia Rashid;Bhatti, Haq Nawaz;Sultan, Misbah;Bibi, Ismat;Nouren, Shazia
    • Membrane Water Treatment
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    • v.9 no.5
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    • pp.301-307
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    • 2018
  • In this research work, synthesis of sugarcane bagasse/zinc aluminium biocomposite and apple peel/zinc aluminium biocomposite and their application for removal of Reactive Red-241 and Acid Orange-7, respectively, was studied using various parameters. At pH 2 the sorption was the highest for both dyes. The trend showed that the dye sorption declined by decreasing the biocomposite dose and enhanced by increasing the dye concentration and temperature. Equilibrium was achieved at 60 minutes for Reactive Red-241 onto sugarcane bagasse/zinc aluminium biocomposite and 90 minutes for Acid Orange-7 onto apple peel/zinc aluminium biocomposite.The research data was good fitted to pseudo-2nd-order kinetic model and Langmuir isotherm. FT-IR analysis was used to confirm the biosorption of the selected dyes at the surface of biosorbent through various binding sites. Surface morphology modification of both biocomposites before and after biosorption was inspected through SEM. Crystallinity of biocomposite was examined through XRD analysis. It was implied that sugarcane bagasse/ zinc aluminium biocomposite and apple peel/ zinc aluminium biocomposite are good adsorbents for dyes elimination from aqueous solutions.

A Study on the Press Forming by Rectangular Tube of Al6063 Alloys (Al6063 합금 중공각재 튜브에 의한 프레스 성형 연구)

  • Lee, Choung-Kook;Kim, Won-Jung
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.6
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    • pp.56-62
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    • 2011
  • In this study, a method for the press forming of rectangular aluminium tube has been proposed. Rectangular aluminium tube has high stiff as the cold steel which can be lighter over 30% weight. It is increased every year by being recycled over 80%. Press die consists of punch, wing-die and holder for aluminium tube bending. When punch is applied with aluminium tube, holder is operated as same punch and wing-die is rotated through hinge. Stress-strain relations and springback are considered by bending angle of aluminium tube. In this study, the behaviors on tubes of square aluminium and rectangular aluminium with different thickness and area are established by the analysis of $DEFORM^{TM}$-3D program. Reducing fuel consumption is expected by using the aluminium tube deformation and it becomes the lightweight through recycling.

Phosphorus Removal by Aluminium Ion Generated with the Pitting Corrosion of Aluminium (알루미늄의 부식으로 발생한 알루미늄 이온에 의한 인 제거)

  • Cheong Kyung-Hoon;Jung Oh-Jin
    • Journal of Environmental Science International
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    • v.8 no.6
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    • pp.705-710
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    • 1999
  • The fundamental experiments on the phosphorus removal from water were carried out by the batch and continuous reactors which used aluminium and copper plate. In this systems, the phosphorus was removed by aluminium ion generated with the electrochemical interaction (pitting corrosion) of aluminium and copper. In the batch experiments, the efficiencies of phosphorus removal increased when the surfaces of aluminium and copper plate were brushed. The phosphorus removal by aluminium ion was affected the copper plate and NaCI in this system. The optimal pH values were 5 and 6 for the phosphorus removal. The efficiency of phosphorus removal increased with increasing NaCI concentration, surface area of aluminium and copper plate. The $CUSO_4{\cdot}5H_2O$ instead of copper plate could be used as Cu source. The effluent $PO_4-P$ concentration as low as 2 $mg/{\ell}$ could have been obtained during the continuous experiment at HRT of 48 hrs.

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Aluminium Aluminium Titanate-Mullite Composites: Part2. Thermal Shock Resistance (Aluminium Aluminium Titanate-Mullite 복합체: Part2. 열충격성)

  • Kim, Ik-Jin;Gang, Won-Ho;Go, Yeong-Sin
    • Korean Journal of Materials Research
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    • v.4 no.2
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    • pp.206-212
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    • 1994
  • Aluminium titanate-mullite composites with varying chemical compositions were prepared by the stepwise hydrolysis of $Si(OC_2H_5)_4$, and $Ti(OC_2H_5)_4$in $AI_2O_3$ ethanolic colloidal dispersion. Sintered bodies having 20-50~01% mullite at $1600^{\circ}C$ for 2h have shown, that it is possible to develop an aluminium titanate with moderately high strength and low thermal expansion coefficient. This was obtained by inhibiting grain site of aluminium titanate with mullite and microcracks. Those with 80-70vol % aluminium titanate have excellent thermal shock resistance and has room-temperature strengths of 31-45MPa. The relation between thermal shock resistance and strength, Young's modulus, sound velocity and thermal expansion coefficient was discussed.

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Variation in Aluminium Tolerance Among 5 Species of In Vitro Cultured Populus (기내(器內)에서 배양(培養)된 5수종(樹種)의 Populus류(類)에 대(對)한 Aluminium 내성비교(耐性比較))

  • Chung, Kyung Ho;Chun, Young Woo
    • Journal of Korean Society of Forest Science
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    • v.79 no.1
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    • pp.26-32
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    • 1990
  • The relative aluminium tolerance of 5 Populus species (Populus davidiana, P. maximowiczii, P. nigra, P. alba ${\times}$ P. glandulosa, and P. nigra ${\times}$ P. maximowicizii) was evaluated on Murashige and Skoog medium with 5 levels of aluminium-EDTA concentration (0, 0.1, 0.2, 0.5, 1.0mM). The number of root initiation of 5 Populus species was significantly affected by the medium containing various levels of aluminium concentration. The native poplar, P. davidiana showed the highest aluminium tolerance among 5 species and even stimulated shoot and root growth on the medium containing at the low levels aluminium, 0.1 to 0.2 mM concentrations. The medium containing 1.0 mM aluminium inhibited root initiation from plantlets of all species except P. davidiana. Plantlets cultured on the medium with more than 0.5 mM aluminium exhibited retarded growth and abnormal leaf shape. P. nigra ${\times}$ P. maximowiczii exhibited significantly higher aluminium tolerance than its parental species. Silvicultural aspects associated with aluminium tolerance of Populus are also discussed.

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Anodization of Aluminium Samples in Boric Acid Solutions by Optical Interferometry Techniques

  • Habib, K.
    • Corrosion Science and Technology
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    • v.4 no.6
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    • pp.217-221
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    • 2005
  • In the present investigation, holographic interferometry was utilized for the first time to monitor in situ the thickness of the oxide film of aluminium samples during anodization processes in boric acid solutions. The anodization process (oxidation) of the aluminium samples was carried out by the technique of the electrochemical impedance spectroscopy(EIS), in different concentrations of boric acid (0.5-5.0% $H_3BO_3$) at room temperature. In the mean time, the real-time holographic interferometry was used to measure the thickness of anodized (oxide) film of the aluminium samples in solutions. Consequently, holographic interferometry is found very useful for surface finish industries especially for monitoring the early stage of anodization processes of metals, in which the thickness of the anodized film of the aluminium samples can be determined without any physical contact. In addition, measurements of electrochemical values such as the alternating current (A.C) impedance(Z), the double layer capacitance($C_{dl}$), and the polarization resistance(Rp) of anodized films of aluminium samples in boric acid solutions were made by the electrochemical impedance spectroscopy(EIS). Attempts to measure electrochemical values of Z, Cdl, and Rp were not possible by holographic interferometry in boric acid especially in low concentrations of the acid. This is because of the high rate of evolutions of interferometric fringes during the anodization process of the aluminium samples in boric acid, which made measurements of Z, Cdl, and Rp are difficult.

Phosphorus and Nitrogen Removal from Synthetic Wastewater by Intermittently Activated Sludge combined with Aluminium Corrosion (알루미늄부식을 조합한 간헐폭기법에 의한 합성폐수 중의 인 및 질소 제거)

  • 정경훈;정오진;최형일
    • Journal of Environmental Health Sciences
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    • v.27 no.3
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    • pp.99-106
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    • 2001
  • A laboratory experiment was performed to investigate phosphorus and nitrogen removal from synthetic wastewater by intermittently activated sludge process packed with aluminium plate. Three continuous experimental systems, I. e. an intermittently activated sludge process(Run A), an intermittently activated sludge process with an aluminium plate packed into the reactor(Run B), and a reactor post stage(Run C) were compared. In the batch experiments, the phosphorus removal time in the reactor packed with copper and aluminium plate simultaneously was faster than that of the reactor packed with only an aluminium plates. However, the reactor packed with only an aluminium plate could be used for phosphorus removal. Move phosphorus was removed with an increase of surface area of aluminium plate and electrolysis(NaCl) concentration. The efficiency of COD and nitrogen removal was not affected in Run B. However, the phosphrus removal efficiency decreased because of reaction products and activated sludge which gradually covered gradually the surface of the aluminium plate. The efficiency of phosphorus removal in Run C was 86.3% at the HRT of 3.2 hours. Especially, the efficiency of phosphorus removal in Run C was higher than that in Run B.

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Effect of Die Angle in the Hydrostatic Extrusion of Copper-clad Aluminium Composites (Copper-clad Aluminium 복합재료의 정수압 압출시 다이 각이 미치는 효과)

  • 한운용;박훈재;윤덕재;정하국;김승수;김응주;이경엽
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.414-417
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    • 2003
  • A copper-clad aluminium composite bar is lighter and less expressive than a commercial copper alloy bar. Copper-clad aluminium composite bar can be fabricated by hot hydrostatic extrusion process. In this work, the effect of die angle on the compressive properties of copper-clad aluminium composites fabricated using hydrostatic extrusion process was investigated experimentally. The results showed that optimum half die angle was in the range of 40$^{\circ}$ to 50$^{\circ}$ for an extrusion ratio of 19. The results also showed that the half die angle had little influence on the compressive strength of copper-clad aluminium composites. A diffusion layer increased with increasing die angle.

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Effects of Aluminium Alloy on the Oxidative Stability of Frying Oil

  • Jong-Youn Son;Soo
    • The Korean Journal of Food And Nutrition
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    • v.7 no.4
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    • pp.318-322
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    • 1994
  • Aluminium alloy, comprising water, silicone manganese and porous aluminium carrier added into soybean oil in order to investigated its effect on polar lipid content, polymer content, conjugated dienoic acid and free fatty acid value during deep-fat frying at 185$^{\circ}C$. Increase rates of polar lipid and polymer content of the frying ell were reduced about one thirds of the oil without aluminium alloy during deep-fat frying. The aluminium alloy, however, have no significantly effect to inhibit the increase of conjugated dienoic acid and free fatty acid value. Treatment of the frying oil with aluminium alloy was found to be able to inhibit polymer and polar lipid formation.

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