以低品位菱镁矿与天然硅石为原料,以Al2O3为添加剂,通过反应烧结制备镁橄榄石.研究讨论Al2O3对镁橄榄石材料相组成、晶胞参数、微观结构及常温性能的影响.用XRD和SEM对烧后试样的相组成和显微结构进行表征.利用X'pert plus软件对试样中镁橄榄石相的晶胞参数进行计算.结果表明:以低品位菱镁矿轻烧氧化镁和天然硅石为原料,经1500℃煅烧合成制备的镁橄榄石中,由于Al2O3的加入,促进了系统中顽火辉石相的形成.Al2O3的加入导致镁橄榄石相的晶胞参数和晶胞体积的增大.随着Al2O3加入量增加,镁橄榄石的相对密度和常温耐压强度逐渐增加,说明了Al2O3对镁橄榄石的促烧结作用.
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