摘要
采用差热扫描示量法(DSC)对平板式固体氧化物燃料电池(p-SOFC)封接材料SrO2-Al2O3-SiO2-La2O3-B2O3玻璃进行析晶动力学分析。运用动力学模型计算出玻璃的析晶活化能为271kJ/mol,析晶过程主要受扩散控制。利用热膨胀数据和VFT粘度方程计算得到玻璃在800～950℃区间对应的粘度曲线。结果表明,该玻璃满足封接的高温流动性要求。在p-SOFC封接和工作温度下对玻璃进行不同时间的热处理,该玻璃转变为微晶玻璃,主晶相为Sr2SiO4和Sr2AlSiO7。通过XRD图谱拟合计算得出,在工作温度下保温时间达到20h以上,玻璃析晶趋势趋于平缓,结晶度在55%以上。
Crystallization kinetics of SrO2-Al2 O3-SiO2-La2 O3-B2 O3 glass, a sealant material for planar solid oxide fuel cells （SOFC） have been investigated by differential scanning calorimetry （DSC）. The activation energy for glass crystallization was calculated to be 271 kJ/mol using bansal kinetic model, and the crystallization process was controlled by diffusion. Thermal expansion data and VFT viscosity equation were employed to calculate the glass viscosities between 800℃ and 950 ℃, which indicates the glass meet the requirements well for high-temperature sealing. After various heat treatments under p-SOFC sealing and operation temperatures, the glass turned into glass-ceramic with the major phases Sr2 SiO4 and Sr2 AlSiO2. Through the fitting calculation of XRD patterns, the crystallization ability tended to be gentle after 20 h heat treatment, with 55% crystallinity.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2011年第10期1-6,共6页
Journal of Wuhan University of Technology
基金
长沙市重点科技攻关项目(K1003027-11)
