原位反应烧成莫来石-堇青石复合材料及其特性(英文)

IN SITU REACTION SINTERING AND CHARACTERIZATION OF MULLITE-CORDIERITE COMPOSITES

通过原位反应烧成方法制备了不同莫来石、堇青石含量比的复合材料。首先,根据堇青石和莫来石的理论化学组成,分别将高岭土、工业氧化铝和滑石混合,配制出堇青石生料粉(C粉)和莫来石生料粉(M粉)。然后,再将C粉和M粉按不同的设计比例混合,烧结制备出一系列莫来石-堇青石复合材料。添加V2O5添加剂,考察其对烧结复合材料的影响。并通过X射线衍射,微观结构观察,热力学性质检验,比较了不同莫来石、堇青石含量比的复合材料的特性。制备的莫来石-堇青石复合材料所用的烧结温度可降低至1380℃,且复合材料中堇青石和莫来石晶体发育良好,复合材料抗热震性好。

Mullite-cordierite composites with different mullite to cordierite ratios were prepared by an in situ reaction sintering method.First,a cordierite started powder （C powder） and a mullite started powder （M powder） were prepared by mixing kaolin,alumina,and talc based on the theoretical chemical composition of cordierite and mullite,respectively.Then,the C powder and the M powder were mixed together at different ratios,formed and sintered to produce a series of mullite-cordierite composites.In order to promote the formation of mullite crystals,the V2O5 additive was introduced.The phase composition,microstructures,thermal and mechanical properties of the composites were characterized by X-ray diffraction etc.The sintering temperature of the composites with only cordierite and mullite phases can be as low as 1 380 ℃.The cordierite and mullite crystals in the composite grow well,and their thermal shock resistance is good.