摘要
以包钢尾矿为主要原料,采用熔融法制备了Ca O-A1_2O_3-MgO-SiO_2系矿渣微晶玻璃陶瓷,采用X射线衍射(XRD)和扫描电子显微镜(SEM)对微晶玻璃陶瓷的物相组成及显微结构进行了表征,并研究了该微晶玻璃陶瓷的常温力学性能和抗Na OH化学侵蚀的动力学过程。结果表明:所制备微晶玻璃陶瓷的主晶相为透辉石,次晶相为石英,平均粒径约为142 nm;其显气孔率为0.05%,体积密度为3.0 g/cm3,常温抗折强度为71 MPa。Na OH侵蚀动力学研究表明:该微晶玻璃陶瓷的失重率随着侵蚀温度的升高而增大。采用阿伦尼乌斯方程和艾琳方程计算了Na OH侵蚀反应的活化能、反应焓及反应熵,其数值分别为40.8、37.9及–134.7 J/mol。
CaO-A1_2O_3-MgO-SiO_2 slag microcrystalline glass ceramics were synthesized via a melting method using the Baotou Iron and Steel Corporation tailings as the main raw material. X-ray diffraction(XRD) and scanning electron microscopy(SEM) were used for the characterization of phase composition and microstructure of the prepared microcrystalline glass ceramics. The room temperature mechanical properties and chemical erosion kinetic behavior of NaOH alkaline solution were also investigated. The results show that the main crystalline phase of the as-prepared microcrystalline glass ceramic with an average particle size of about 142 nm is diopside, and the secondary phase quartz. The room temperature MOR, porosity, and density of the microcrystalline glass ceramics are 71 MP, 0.05%, and 3.0 g/cm^3, respectively. The study on NaOH erosion kinetic indicate that the mass loss of the microcrystalline glass ceramics increases with increasing temperature. The activation energy, enthalpy, entropy calculated from Arrhenius and Eyring equation are 40.8, 37.9, –134.7 J/mol, respectively.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第S1期277-280,共4页
Rare Metal Materials and Engineering
基金
内蒙古科技大学白云鄂博矿多金属资源综合利用重点实验室开放基金项目
