ZrO_2对钙钛矿/六铝酸钙复相材料组成结构的影响

Effect of Zirconia on Composition and Structure of Perovskite/Calcium-hexaluminate Material

以铁合金厂含铝废渣为主要原料,通过高温固相反应制备钙钛矿/六铝酸钙复相材料,研究了不同ZrO2加入量及煅烧温度对合成材料相组成、微观结构影响。利用XRD、SEM及相关分析软件对烧后试样中结晶相的晶胞参数、晶胞体积、相对结晶度及微观结构进行计算和分析。结果表明,加入氧化锆会改变合成产物中结晶相的结构缺陷形式和数量,虽然导致了微观结构中液相量增大,烧后试样相对结晶度降低,但却促进合成产物中结晶相的晶粒长大。煅烧温度的升高也减弱了由于加入氧化锆对烧后试样结晶度降低的影响,并且随着热缺陷数量增大,合成产物中结晶相晶粒逐渐长大。

Perovskite/Calcium-hexaluminate material was prepared by solid reaction of aluminum- containing slag from ferroalloy plant as the main raw materials. The effect of ZrO2 additive and sintering temperature on composition and structure of synthetic materials was studied. The lattice parameters and volume of crystalline phase, relative crystallinity and microstructure of synthetic materials were determined and calculated by XRD, SEM and related software. Results show that the defects form and quantity of crystalline phases in the synthetic product can be changed by Zr02 addition. The relative crystallininty of crystalline phase in burned samples was decreased with liquid increasing. Crystalline grain could be promoted to grow up by ZrO2 addition. The effect of ZrO~ on the relative crystallinity of synthetic product was weakened by elevated sintering temperature. Thermal defects and crystalline phase grains growth were promoted by elevated sintering temperature.