铝钛渣固相反应合成六铝酸钙材料的研究

Research on Calcium-hexaluminate Material Prepared by Solid Reaction of Alumina-Titania Slag

以铁合金厂铝钛渣为主要原料,通过高温固相反应制备六铝酸钙材料,研究不同煅烧温度对六铝酸钙材料相组成、微观结构、致密度以及主晶相六铝酸钙的晶胞常数的影响。用XRD分析法和SEM法对烧后试样的相组成和显微结构进行研究,利用X'pert plus软件对试样中六铝酸钙的晶格常数、晶胞体积及相对结晶度进行计算。结果表明,随着煅烧温度的增高,六铝酸钙材料结构中的热缺陷浓度增大,六铝酸钙晶格常数和晶胞体积逐渐增大,六铝酸钙材料的体积密度及微观结构致密性逐渐增大,微观结构中液相量逐渐增多,六铝酸钙材料的相对结晶度降低。

Calcium-hexaluminate material was prepared by solid reaction of alumina-titania slag from ferroalloy plant as the main raw materials.The effects of sintering temperature on crystalline phase compositon,microstructure,density and lattice parameters and volume of calcium-hexaluminate were studied.The results showed that calcium-hexaluminate material could be prepared by solid reaction of alumina-titania slag from ferroalloy plant.The concentration of thermal defects in the calcium-hexaluminate material increases as the sintering temperature increasing,and the lattice parameters and volume of calcium-hexaluminate increase gradually.More liguid generated at high temperature in the structure of calcium-hexaluminate promote the development of density and compactness of microstructure,also the decrease of relative crystallinity of the calcium-hexaluminate samples.