Kinetics of deposition of MgO coating on surface of MgO-CaO clinker

李波涛

doi:10.3969/j.issn.0438-1157.2012.05.041

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Kinetics of deposition of MgO coating on surface of MgO-CaO clinker

更新时间：2025-12-10

- Kinetics of deposition of MgO coating on surface of MgO-CaO clinker
- CIESC Journal Issue 5, Pages: 1615-1621(2012)
- 作者机构：
  
  西安建筑科技大学材料科学与工程学院
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.05.041
  CLC： Q175.713
- Online First：05 May 2012，
  
  Published：05 May 2012
- 稿件说明：
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李波涛. Kinetics of deposition of MgO coating on surface of MgO-CaO clinker[J]. CIESC Journal, 2012, (5): 1615-1621.
DOI：

李波涛. Kinetics of deposition of MgO coating on surface of MgO-CaO clinker[J]. CIESC Journal, 2012, (5): 1615-1621. DOI： 10.3969/j.issn.0438-1157.2012.05.041.

摘要

采用MgO碳热还原和扩散氧化法在镁钙砂表面沉积MgO涂层，研究了MgO涂层的沉积动力学、微观形貌、生长机制以及涂层厚度对镁钙砂抗水化性能的影响。结果表明：随着反应温度的升高，沉积过程存在两个控制机理，在1400～1500℃之间，为化学动力学控制，反应为一级反应，活化能为97.82 kJ·mol-1;在1500～1600℃之间，沉积过程为扩散控制，扩散活化能为19.18 kJ·mol-1；MgO涂层以方镁石和方钙石为基底均呈二维台阶状生长，但二者生长机制并不完全相同；抗水化实验结果显示最佳处理温度为1600℃、沉积时间为6 h，镁钙砂水化质量增加率为0.02%，约是处理前的1/150。

Abstract

MgO-CaO clinker refractory has the disadvantage of poor hydration resistance.MgO coating was deposited on the surface of MgO-CaO clinker by carbothermal reduction of MgO with carbon black as reducing agent and oxidation of the resulted vapor-phase Mg through diffusion.Deposition kinetics，morphology and growth mechanism of MgO coating and influence of coating thickness on hydration resistance of MgO-CaO clinker were investigated.The results indicated that there existed two kinds of controlling mechanism at 1400—1600℃.Deposition process was controlled by chemical reaction and the apparent activated energy was 97.82 kJ·mol-1 at 1400—1500℃.However，at 1500—1600℃ the process was controlled by diffusion，and the apparent activated energy was 19.18 kJ·mol-1.Morphology of MgO coating showed that the MgO growth on magnesia or calcia was typical two-dimensional step-like，but the growth mechanism of MgO coating on either one was not the same.Hydration results showed that the optimal process parameters was that MgO-CaO clinker was treated at 1600℃ for 6 h，and the mass gain percent for treated MgO-CaO clinker was 0.02%，which was 1/150 of untreated one.

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