A novel approach for magnesia hydration assessment in refractory castables

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• 作者：Rafael Salomã ; o ; L.R.M. Bittencourt ; V.C. P ; olfelli
• 关键词：Magnesia hydration ; Refractory castables ; Curing temperature
• 刊名：Ceramics International
• 出版年：2007
• 出版时间：July 2007
• 年：2007
• 卷：33
• 期：5
• 页码：803-810
• 全文大小：826 K

文摘

Magnesium oxide (MgO) or magnesia is one of the most important raw materials in the refractory industry. Because of its high refractoriness (melting point of 2800 °C) and corrosion resistance, the presence of this oxide in refractory compositions promotes an increase in the performance of pre-shaped linings for steel production [1], [2], [3] and [4]. Nevertheless, in refractory castables formulations, magnesia additions are restricted to coarse particles (usually above 50 μm) and contents of up to 10 wt. % due to their high tendency to react with water and the following great volumetric expansion promoted by this reaction [5], [6], [7], [8], [9], [10], [11], [12] and [13]. Despite the great number of studies describing the behavior of powdered magnesia or high-magnesia bricks, not much research has systematically been done related to its hydration behavior in castables [7], [13], [14], [15], [16], [17] and [18]. In this paper, aspects of magnesia hydration were briefly reviewed. Novel insights concerning magnesia hydration products generated under different curing conditions were attained adapting techniques already used in castables study.