• Title, Summary, Keyword: Magnesium

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Optimal Sythesis Conditions of Magnesium Trisilicate (규산마그네슘의 최적합성조건)

  • Shin, Wha-Woo;Park, In-Hyun
    • YAKHAK HOEJI
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    • v.44 no.6
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    • pp.545-551
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    • 2000
  • Magnesium trisilicate was prepared by reacting Magnesium sulfate solution with Sodium silicate solution in this study. The optimum synthesis conditions base on the yield of the product were established by applying Box-Wilson experimental design. It was found that the optimum synthesis conditions of Magnesium trisilicate were as follows; Reacting temperature : $57{\sim}90^{\circ}C$, Concentration of reactant solution : $19.1{\sim}20.0%$, Molar concentration ratio of two reactants : [Sod.silicate]/[Mg.sulfate] : $1.47{\sim}1.80$, Temperature of washing water : $45{\sim}48^{\circ}C$, Drying temperature : $65{\sim}82^{\circ}C$. The antacidic capacity of the five Magnesium trisilicate samples which shows the maximum antacidic efficacy was tested by pharmacopeia acid consuming capacity test. The five Magnesium trisilicate samples were identified by chemical analysis.

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Effect of Dietary Magnesium on Stress Reactions in Rats with Abdominal Surgery (마그네슘 부족식이가 수술받은 쥐의 Stress 반응에 미치는 영향)

  • 손숙미
    • Journal of Nutrition and Health
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    • v.25 no.5
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    • pp.397-403
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    • 1992
  • This study was performed to investigate the effect of dietary magenesium on stress reactions in rats having abdominal surgery. Sixty three male rats of sprague-dawley strain were blocked into 3 groups : rats fed regular magnesium (0.05% Mg: control) rats receiving regular magnesium with surgery(Mg-adeq : S) Five weeks after feeding abdominal surgery was performed and randomly chosen 7 rats from each group were sacrificed on 1, 3 and 5 days after surgery. Te following were found ; 1) Rats fed marginal magnesium showed significantly elevated urinary urea nitrogen urinary potassium and plasma glucose compared controls only one day after abdominal surgery but not 3 days or 5 days after surgery 2) Rats fed adequate magnesium did not show any significant change in metabolic stress indicator after surgery. 3) Plasma free fatty acid and cortisol level were not different among groups. 4) Decreased plasma magnesium and potassium level were found in rats fed marginal magne-sium and sacrificed one day and three days after surgery.

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The Characteristic of a Hydrostatic Extrusion of Magnesium Alloy(AZ31) (Mg 합금(AZ31)의 열간 정수압 압출 특성에 관한 연구(I))

  • Yoon D. J.;Seo Y. W.;Jeong H. G.;Na K. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.128-131
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    • 2004
  • Magnesium alloys are being extensively used in weight-saving applications and as a potential replacement for plastics in electronic and computer applications. Magnesium alloy has some good characteristics, EMI shielding property and high specific strength. Nevertheless their high brittleness make it uneasy to process the magnesium. Magnesium alloys are extruded like aluminium alloys. The present work was done to find a characteristic of magnesium alloy(AZ31) changing the extrusion ratio 8.5, 19.1, 49 respectly and changing the die half angle $30^{\circ},\;45^{\circ},\;60^{\circ}$. Here this present done by the hydrostatic extrusion in the hot condition, $310^{\circ}$. The higher the extrusion ratio goes, the higher the extrusion force goes.

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Fused Salt Electrolysis of Magnesium Chloride (염화마그네슘의 용융염전해 연구)

  • Lee, Hoo-In
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.546-547
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    • 2007
  • Magnesium is widely used as a lightweight alloy for car engine components and case of cellular phone. Extraction technologies of magnesium are divided to fused salt electrolysis process and thermal reduction process. In this study, electrolysis magnesium is prepared by fused salt electrolysis process with magnesium chloride. We compared two kinds of mixed salt at 7V. As a result, 47% of current efficiency was obtained by electrolyzing KCl/NaCl/$MgCl_2$ mixed salt bath at $760^{\circ}C$, and purity of the prepared magnesium was over 98%. With this study, we can scale up fused salt electrolysis device and accumulate basic data which will be needed for designing an electrolysis cell.

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Influence of Magnesium Oxide on Carbon Dioxide Adsorption Behaviors of Mesoporous Carbons (메조포어러스카본의 마그네슘 옥사이드의 처리에 따른 이산화탄소 흡착 거동)

  • Jang, Dong-Il;Park, Soo-Jin
    • 한국신재생에너지학회:학술대회논문집
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    • pp.221.2-221.2
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    • 2011
  • In this study, we prepared the magnesium oxide decorated ordered mesoporous carbons processed by the reduction of magnesium oxide precursor on the CMK-3 surfaces in order to investigate the characterization and the effect on their carbon dioxide adsorption behaviors. The magnesium contents of the prepared samples were characterized using XPS. The textural properties of the prepared samples were investigated by $N_2$/77 K adsorption isotherms by BET equation. The carbon dioxide adsorption capacities of the prepared samples were investigated by the amounts of carbon dioxide adsorptions at 298 K and 1.0 atm. The results showed that the magnesium oxide on the CMK-3 surface enhanced interaction between carbon dioxide and adsorbents. Consequently, it was found that the magnesium oxide led to an increase in the carbon dioxide adsorption capacity of the CMK-3.

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Development of magnesium tube manufacturing technology with strip cast and warm rolled AZ31 sheet. (마그네슘 압연판재를 이용한 용접 튜브 제조 기술 개발)

  • Lee, Mok-Young;Han, Soo-Sik;Chang, Woong-Seong;Lee, Heung-Gyu
    • Proceedings of the KWS Conference
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    • pp.96-96
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    • 2010
  • Magnesium alloy is being used for structural material since it has high specific strength. Tubular shape was effective way for enhanced structural design. To manufacture the tube, it is necessary to weld the butted joint of both tubular formed sides. But the magnesium alloy was hardly welded with conventional welding processes. The laser welding was effective way to joint magnesium alloys because it had high weld strength and productivity compare with other welding processes. In this study, magnesium alloy sheets was formed at elevated temperature to tubular shape and welded with laser. Consequently, the magnesium alloy tube was making successful with warm forming and laser welding and bicycle frame was making with it.

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Study on Hardness and Corrosion Resistance of Magnesium by Anodizing and Sealing Treatment With Nano-diamond Powder (양극산화와 나노 다이아몬드 분말 봉공처리에 의한 마그네슘의 경도와 부식에 관한 연구)

  • Kang, Soo Young;Lee, Dae Won
    • Journal of Korean Powder Metallurgy Institute
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    • v.21 no.4
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    • pp.260-265
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    • 2014
  • In this study, in order to increase surface ability of hardness and corrosion of magnesium alloy, anodizing and sealing with nano-diamond powder was conducted. A porous oxide layer on the magnesium alloy was successfully made at $85^{\circ}C$ through anodizing. It was found to be significantly more difficult to make a porous oxide layer in the magnesium alloy compared to an aluminum alloy. The oxide layer made below $73^{\circ}C$ by anodizing had no porous layer. The electrolyte used in this study is DOW 17 solution. The surface morphology of the magnesium oxide layer was investigated by a scanning electron microscope. The pores made by anodizing were sealed by water and aqueous nano-diamond powder respectively. The hardness and corrosion resistance of the magnesium alloy was increased by the anodizing and sealing treatment with nano-diamond powder.

A Study on Warm Forming Technology of Car Body Reinforced Dash Using Magnesium Alloy Sheet (마그네슘 합금 판재를 활용한 차체 Reinforced Dash 부품 온간성형 공정 연구)

  • Park, Dong Hwan;Tak, Yun Hak
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.23 no.5
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    • pp.519-524
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    • 2014
  • The use of light weight magnesium alloy offers significant potential towards improvement of the automotive fuel efficiency. However, the application of formed magnesium alloy components in auto-body structures is restricted due to the low formability at room temperature and lack of knowledge for processing magnesium alloys at elevated temperatures. In this study, a warm tensile test of magnesium alloys was performed to measure tensile strength and elongation. An improvement in formability was confirmed at increased temperatures above about $250^{\circ}C$. Car body warm forming technology was conducted for forming forming reinforced dash components of the magnesium alloy AZ31B sheet at elevated temperatures.

A Study on the Evaporation Behavior of Magnesium Alloy (AM50) Scrap Melt under Reduced Pressure (감압 하에서 마그네슘 합금(AM50) 스크랩 용탕의 증발 거동에 관한 연구)

  • Wi, Chang-Hyun;Hong, Seong-Hun;You, Byung-Don
    • Korean Journal of Metals and Materials
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    • v.48 no.3
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    • pp.241-247
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    • 2010
  • In order to develop the vacuum distillation process of magnesium alloy scrap, a fundamental study on the evaporation behavior of magnesium alloy (AM50) scrap melt was carried out. Melt temperature, pressure, reaction time, and initial specific surface area of melt were considered as experimental variables. The evaporation rate of magnesium increased with the increase of melt temperature and initial specific surface area of melt, and with the decrease of the pressure. The activation energy of magnesium evaporation reaction calculated by an Arrhenius plot decreased with the decrease of the pressure and with the increase of the initial specific surface area of melt. An empirical equation was derived for the evaporation rate of magnesium from AM50 alloy melt.

Magnesium Thin Films Possessing New Corrosion Resistance by RF Magnetron Sputtering Method

  • Lee, M.H.;Yun, Y.S.;Kim, K.J.;Moon, K.M.;Bae, I.Y.
    • Corrosion Science and Technology
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    • v.3 no.4
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    • pp.148-153
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    • 2004
  • Magnesium thin flims were prepared on cold-rolled steel substrates by RF magnetron sputtering technique. The influence of argon gas pressure and substrate bias voltage on their crystal orientation and morphology of the coated films were investigated by scanning electron microscopy (SEM) and X-ray diffraction, respectively. And the effect of crystal orientation and morphology of magnesium films on corrosion behaviors was estimated by measuring anodic polarization curves in deaerated 3%NaCl solution. From the experimental results, all the sputtered magnesium films showed obviously good corrosion resistance to compare with 99.99% magnesium target of the sputter-evaporation metal. Finally it was shown that the Corrosion-resistance of magnesium films can be improved greatly by controlling the crystal orientation and morphology with effective use of the plasma sputtering technique.