熔制保温时间对CAMS系矿渣微晶玻璃结构与性能的影响

发布时间：2018-04-10 08:55

本文选题：熔制保温时间　切入点：矿渣微晶玻璃　出处：《材料导报》2017年18期

【摘要】：以白云鄂博二次选后尾矿、高炉渣和粉煤灰为主要原料,采用熔融法制得CaO-Al_2O_3-MgO-SiO_2(CAMS)系微晶玻璃,利用DSC、XRD、SEM、EDS、Raman、红外光谱及理化性能测试手段,研究了熔制过程中不同保温时间对微晶玻璃结构与性能的影响。结果表明:随着熔制保温时间的延长,矿渣玻璃熔液中氟的挥发及对氧化铝坩埚的侵蚀导致基础玻璃中氟含量降低而Al2O3含量升高,基础玻璃析晶温度呈先上升后下降的趋势,微晶玻璃主晶相为透辉石,晶粒出现先细化后粗化的趋势,第二相萤石相随着保温时间的延长逐渐消失,最终导致微晶玻璃结构及理化性能发生改变。当玻璃熔制保温时间为5h时,制备的微晶玻璃综合性能最优,其密度、抗折强度、显微硬度及耐酸碱性分别为3.09g/cm3、201 MPa、7 021 MPa、97.78%和98.83%。
[Abstract]:CaO-Al2O3-MgO-SiO2CAMS-based glass-ceramics were prepared from tailings of Bayan Obo secondary separation, blast furnace slag and fly ash as main raw materials, and CaO-Al2O3-MgO-SiO2CAMS-based glass-ceramics were obtained by melting method.The effect of different holding time on the structure and properties of glass-ceramics was studied.The results show that with the prolongation of melting and holding time, fluoride volatilization in slag glass melt and erosion of alumina crucible lead to the decrease of fluoride content and increase of Al2O3 content in base glass, and the crystallization temperature of base glass increases first and then decreases.The main crystal phase of glass-ceramics is diopside, the grain size is thinned first and then coarsened, and the second phase fluorite phase disappears gradually with the prolongation of holding time, which leads to the change of structure and physical and chemical properties of glass-ceramics.When the heat preservation time of glass melting was 5 h, the comprehensive properties of the glass ceramics were the best. The density, flexural strength, microhardness and acid and alkali resistance of the glass ceramics were 97.78% and 98.83%, respectively.
【作者单位】：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;内蒙古科技大学理学院;
【基金】：国家自然科学基金(11564031) 内蒙古自治区高等学校科学研究项目(NJZY158) 内蒙古科技大学创新基金(2014QDL042) 内蒙古创新引导奖励资金项目(4140300501)
【分类号】：TQ171.733

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