Vaporization from Refractory Bricks of the System MgO-Al<sub>2</sub>O<sub>3</sub>-Cr<sub>2</sub>O<sub>3</sub> and Effect of Oxide Additives on Vaporization Rate of MgAlCrO<sub>4</sub>

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  • LEE Hong Lim
    Research Laboratory of Engineering Materials, Tokyo Institute of Technology
  • SATA Toshiyuki
    Research Laboratory of Engineering Materials, Tokyo Institute of Technology

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  • MgO-Al<sub>2</sub>O<sub>3</sub>-Cr<sub>2</sub>O<sub>3</sub>系耐火物の蒸発挙動とMgAlCrO<sub>4</sub>スピネルの蒸発速度に及ぼす添加剤の影響
  • MgO Al2O3 Cr2Or2O3ケイ タイカブツ ノ ジョウハツ キョドウ

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Abstract

The vaporization behavior of multicomponent commercial refractories composed mainly of the system MgO-Al2O3-Cr2O3 was studied at 1600°C in vacuum It is found that the least volatile component in refractories, i.e., Al2O3, CaTiO3 or Mg (Al1-xCrx) 2O4, remained on the surface and made a non-volatile stable surface layer which disturbed diffusion of the more volatile components.<br>The vaporization rate of MgAlCrO4 spinel increased with increasing amount of additives, most pronounced with CaO followed by Fe2O3 and SiO2. Effect of CaO was explained by the formation of a volatile compound 8CaO⋅6Al2O3⋅2CrO3.

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