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以轻烧镁砂粉和轻烧白云石粉为原料在不同的烧结温度下制备了MgO-CaO材料。研究了不同的烧结温度对MgO-CaO材料的显微结构及体积密度、抗水化等性能的影响。结果表明,MgO-CaO材料的主要矿相为MgO、CaO,与烧结温度无关,其合成实际上是原料中的MgO与CaO在高温下扩散至均匀以及MgO、CaO晶粒长大的过程;MgO-CaO材料的相对密度随温度的变化呈现抛物线增长趋势,MgO-CaO材料的抗水化性能取决于CaO的分布及其晶粒的大小,烧结温度越高,CaO分布越均匀,晶粒粒径越大,抗水化性能越好;只有当烧结温度大于1830℃时,才能制备致密度高、MgO与CaO分散均匀、晶粒发育完善、抗水化性能优越的MgO-CaO材料。
The MgO-CaO materials were prepared at different sintering temperatures using light burned magnesia powder and light burned dolomite powder as raw materials. The effects of sintering temperature on the microstructure, bulk density and hydration resistance of MgO-CaO were investigated. The results show that the main phase of MgO-CaO is MgO and CaO, which has nothing to do with the sintering temperature. The synthesis of MgO-CaO is actually the process of MgO and CaO diffusing to homogeneity and the grain growth of MgO and CaO in the raw material. The relative density of -CaO material shows a parabolic growth trend with temperature. The hydration resistance of MgO-CaO material depends on the distribution of CaO and its grain size. The higher the sintering temperature, the more uniform the CaO distribution and the smaller the grain size The higher the hydration resistance, the better the hydration resistance. The MgO-CaO material with high density, uniform MgO and CaO distribution, perfect grain growth and superior hydration resistance can be prepared only when the sintering temperature is higher than 1830 ℃.