摘要
以铁尾矿和金尾矿为主要原料,采用熔融法制备了添加020wt%Fe2O3的CaO-MgO-Al2O3-SiO2（CMAS）系纳米晶尾矿微晶玻璃,利用差示扫描量热分析（DSC）、X射线衍射分析（XRD）、红外光谱（IR）、扫描电镜（SEM）和综合力学性能仪等测试手段,研究了Fe2O3含量对该体系微晶玻璃显微结构及性能的影响。实验结果表明:随着Fe2O3含量的增加,样品的晶化温度和玻璃化转变温度逐渐降低;且Fe2O3可促进主晶相透辉石相(Mg0.6Fe0.2Al0.2)Ca(Si1.5Al1.5)O6的形成;同时Fe2O3能够有效减小透辉石相平均晶粒尺寸;另外,微晶玻璃的密度、显微硬度和耐碱性随晶粒尺寸的减小而增加,而抗折强度和耐酸性随晶粒尺寸的减小而降低。
CaO-MgO-SiO_2-Al_2O_3 nanocrystalline tailing-based glass-ceramics with extra addition of 0—20wt%Fe_2O_3 were prepared by the traditional melting-casting method using iron tailings and gold tailings as main materials.The effect of Fe_2O_3 on the microstructure and properties was systematically investigated by differential scanning calorimetry(DSC),X-ray diffraction analysis(XRD),infrared spectra(IR),scanning electron microscopy(SEM) and universal mechanical properties tester,etc.The results show that the crystallization temperature and glass transition temperature of the sample are gradually reduced by the addition of Fe_2O_3,and the main crystal phase in the glass-ceramics is identified as the(Mg_(0.6)Fe_(0.2)Al_(0.2))Ca(Si_(1.5)Al_(1.5)) O_6 diopside phase(JCPDS 72-1379) is enhanced.Meanwhile,Fe_2O_3 could effectively decrease the average grain size of diopside.In addition,the density,microhardness and resistances to alkali corrosion of glass-ceramics are improved with the decreasing of the average grain size,but the bending strength and resistances to acid corrosion are decreased with the decreasing of the average grain size.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2016年第1期176-181 186,共7页
Journal of Synthetic Crystals
基金
内蒙古创新引导奖励资金项目(414030501)
内蒙古科技计划项目(41402060901)
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)
