【摘要】 采用熔融法制备了不同氧化铈含量的MgO-Al2O3-SiO2系玻璃;采用差热分析方法研究了氧化铈含量对MgO-Al2O3-SiO2系玻璃转变温度和晶化峰值温度的影响以及该系玻璃的晶化机理;采用红外光谱技术研究了氧化铈对玻璃结构的影响,并验证了玻璃的差热分析结果;采用X射线粉末衍射分析方法对经900℃热处理后不同氧化铈含量的玻璃样品进行了晶相分析。研究结果表明:加入少量的氧化铈(w(CeO2)≤4%)能降低玻璃的转变温度,有利于玻璃粉体的烧结和促进α-堇青石相的形成,但氧化铈含量超过4%时将起相反作用;玻璃的析晶难易程度和析晶峰温度的高低不存在相互对应关系;玻璃的析晶活化能随着氧化铈含量的增加而增加;所有玻璃的晶化为表面晶化。更多还原

【Abstract】 Glasses of the MgO-Al₂O₃-SiO₂ system were prepared by quenching of molten.The effect of CeO₂ content on the glass transition and crystallization temperature of the MgO-Al₂O₃-SiO₂ system and the crystallization mechanism were investigated by DTA（differential thermal（analysis）.） The effect of CeO₂ content on the glass structure was studied using FTIR spectra technology to verify the results in DTA.Phase compositions of glass samples with different contents of CeO₂ sintered at 900 ℃ were measured by X-ray diffraction.The results show that the addition of CeO₂（w（CeO₂）≤4%） can obviously decrease glass transition temperature and improve the formation of α-cordierite phase.The mass fraction of CeO₂ over 4% inhibits the phase transformation of μ-to α-cordierite and sintering.Whether it is difficult or easy for the glass to crystallize does not show whether the glass crystallization peak temperature is high or low.The crystallization activation energy increases with the increase of CeO₂ content.The crystallization mechanism of all the glass is believed to crystallize from the surface.更多还原