α-堇青石矿渣微晶玻璃热处理工艺优化及氟的影响  

Heat Treatment Optimization and the Effect of Fluorine on the Slag Glass-ceramics of α-Cordierite System

作　　者：吴伟良 李保卫 赵鸣 石钰 WU Weiliang;LI Baowei;ZHAO Ming;SHI Yu(Key Laboratory of Integrated Exp/oitation of Bayan Obo Mu/ti-Meta/ Resources Inner Mongoha University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室

出　　处：《中国陶瓷》2018年第10期48-53,共6页China Ceramics

基　　金：973项目(2012CB722802)结余经费资助项目

摘　　要：研究以白云鄂博西尾矿、粉煤灰为主要原料,用1~7 wt%的MgF2渐近取代原组分中的MgO,采用熔融工艺成功制备了α-堇青石基矿渣微晶玻璃。采用XRD、SEM及相关力学及电学测试手段研究核化温度、晶化温度等热处理工艺参数及氟含量变化的影响。研究结果表明在所研究条件下760℃和1050℃分别进行核化与晶化热处理最有利于α-堇青石的析出。此时,随着F^-含量的增加,α-堇青石相先增加后减少,同时由六方柱变为条针状。MgF_2取代量为3wt%时,所制备α-堇青石微晶玻璃表现出最佳综合性能：维氏硬度7.04 GPa,抗折强度113.5 MPa,平均热膨胀系数1.86×10^（-6）/℃,介电常数6.62,介电损耗~10^（-2）。其抗折强度与热膨胀系数已与工业堇青石相当。In the context of substituting MgO with 1 - 7 wt% MgF2, the traditional melting to casting method was successfully adopted to prepare the slag glass-ceramics of α-cordierite system from Bayan Obo Western tailings and fly ash. XRD, SEM, and the relevant mechanical and electrical testing methods were used to study the effect of varying heat-treatment parameters, such as nucleating and crystallizing temperature, and the amount of MgO substitution by MgF2 on the microstructure and properties of the α-cordierite based glass ceramics. The result shows that 760 ℃ and 1050 ℃ are respectively the best temperatures for nucleating and crystallizing heat-treatment in this study. Moreover, with the increase of the substitution of MgO by MgF2 to 5 wt%, the formation of α-cordierite increases and then decreases with further increase of the substitution. Meanwhile, the morphological feature of α-cordierite crystals changes from that of resembling hexagonal column into needle-alike gradually. The sample, in which MgO substituted by 3 wt% MgF2, shows the optimal comprehensive performance. Its Vickers hardness is 7.04 GPa, bending strength 113.5 MPa, average thermal expansion coefficient 1.86 ×l0^-6/℃, dielectric constant 5.62, dielectric loss -l0^-2. The bending strength and coefficient of thermal expansion （CTE） values in this study are already comparable to those of industrial cordierite.

关 键 词：矿渣微晶玻璃 α-堇青石 氟 热处理 显微结构 

分 类 号：TQ171[化学工程—玻璃工业]