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8CaO·6Al2O3·2CrO3의 고온증발
High Temperature Vaporization of 8CaO·6Al2O3·2CrO3
HWAHAK KONGHAK, April 1980, 18(2), 109-116(8), NONE
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Abstract
Ca-Al-Cr-O계의 새로운 화합물로 알려진 8CaO·6Al2O3·2CrO3에 대한 증발기구를 밝히기 위하여 600 ℃ ∼ 1,320 ℃의 온도범위에서 수소 및 수소-수증기분위기하에서 연구하였다. 주어진 온도에서 이 화합물은 CaO·Al2O3（s）, CaO·Cr2O3(s) 및 CaO(s)로 분해되어 표면층을 형성하며, 내부에서 분해된 산소가 이 표면층을 통하여 확산하는 과정이 증발반응의 율속단계인 것으로 믿어진다.
The vaporization mechanism of 8CaO·6Al2O3·2CrO3 was studied in 1 atm of H2 and H2-H2O atmospheres over the temperature range of 600 to 1,320 ℃.
It was found that the weight loss of 8CaO·6Al2O3·2CrO3 is attributed to the reduction of CrO3 and the vaporization rate is controlled by diffusion of oxygen through the stable surface layer composed of CaO·Al2O3, CaO·Cr2O3, and CaO which is formed on the sample surface due to the incongruent vaporization of 8CaO·6Al2O3· 2CrO3.
It was observed that the increase of water vapor pressure in the H2-H2O atmosphere enhances the vaporization rate of 8CaO·6Al2O3·2CrO3.
It was found that the weight loss of 8CaO·6Al2O3·2CrO3 is attributed to the reduction of CrO3 and the vaporization rate is controlled by diffusion of oxygen through the stable surface layer composed of CaO·Al2O3, CaO·Cr2O3, and CaO which is formed on the sample surface due to the incongruent vaporization of 8CaO·6Al2O3· 2CrO3.
It was observed that the increase of water vapor pressure in the H2-H2O atmosphere enhances the vaporization rate of 8CaO·6Al2O3·2CrO3.
