【摘要】 实验利用廉价的工业原料氧化铝、滑石、粘土等,加入少量添加剂和晶核剂TiO2,采用粉末烧结法制备出了具有低的介电常数、低的热膨胀系数和高的抗折强度等优良性能的MgO-A l2O3-SiO2系堇青石微晶玻璃。样品最佳热处理制度为:核化780℃,保温2h,晶化990℃,保温2h,升温速率3℃/m in。样品析出主晶相为α-堇青石,伴有少量镁橄榄石(Mg2SiO4)、镁铝钛酸盐(MAT)和金红石(TiO2)次晶相。更多还原

【Abstract】 MgO-Al₂O₃-SiO₂ cordierite glass-ceramics characterized by low dielectric constant,low thermal expansion and high bending strength were prepared by powder sintering method and using cheap industrial raw materials,such as alumina,talcum and kaolin in this experiment.At the same time a small amount of additive and nucleation agent TiO₂ were also added in order to improve its performance.The results show that the optimal processing regime is nucleation at 780℃ for 2h followed by crystallization at 990℃ for 2h with heating rate 3℃/min.The main crystalline phase α-cordierite together with a small quantity of secondary phases forsterite,MAT and rutile were detected by XRD and SEM.更多还原