【摘要】 采用高温熔融法制备了MgO-Al2O3-SiO2(MAS)系堇青石基微晶玻璃。借助X射线衍射仪(XRD)、扫描电镜(SEM)及热膨胀系数仪研究了晶化热处理工艺、MgO/Al2O3质量比以及晶核剂种类(TiO2/ZrO2)与含量对MAS系堇青石基微晶玻璃理化性能和晶化特性的影响。结果表明:在核化温度750℃、保温时间l h,晶化温度1050℃、保温时间2.5 h,升温速率5℃/min时,微晶玻璃中堇青石含量最高,析晶性能最好;当MgO/Al2O3质量比为1左右时,在30~700℃温度范围内,平均热膨胀系数最小,在4.4~4.8×10-6K-1范围内可调;TiO2是MAS系堇青石基微晶玻璃的有效晶核剂,而ZrO2的加入并不利于基础玻璃的晶化。更多还原

【Abstract】 The cordierite-based MgO-Al2O3-SiO2( MAS) glass-ceramics were prepared by a melting method. The crystallization heat treatment process,ratio of MgO / Al2O3,and different type and quantity of nucleation agent were identified as having significant effects on physical and crystallization properties of the cordierite-based glass-ceramic. The optimized conditions for the enhancement of these performances were investigated by X-Ray Diffraction( XRD),Scanning Electron Microscope( SEM) and Thermal Expansion Coefficient Differential Apparatus. It is found that good crystallization performance and low thermal expansion coefficient( 4. 50 × 10-6K-1) are obtained when calcining at the nucleation temperature( 750 ℃) for 1 h,and the crystallization temperature( 1050 ℃) for 2. 5 h with the heating rate of 5 ℃ / min; when the ratio of MgO / Al2O3is around 1,the thermal expansion coefficient is among 4. 4 ~ 4. 8 × 10- 6K- 1,which is in good agreement with the predicted results; an analysis of obtained results indicate that TiO2is an efficient nucleation agent for the cordierite-based MAS glass-ceramic rather than ZrO2.更多还原