摘要
纳米金红石TiO2粉末在高温热膨胀仪中进行恒速无压烧结,升温速率为2℃/min和5℃/min,热膨胀仪自动记录烧结收缩量,根据全期烧结模型,建立TiO2主烧结曲线;利用阿基米德法测量烧结体的相对密度,利用扫描电镜观察烧结体在不同温度的显微组织演变。结果表明:利用主烧结曲线得到的相对密度和Archimedes法实测的密度吻合,证明了主烧结曲线对烧结路径不敏感,烧结体的相对密度仅是时间和温度的函数。烧结体的显微组织是烧结温度和时间的函数,烧结体的相对密度和显微组织有关联,主烧结曲线理论可以用来预测和控制烧结体的相对密度、显微组织和陶瓷性能。
The master sintering curve （MSC） of rutile of TiO2 was constructed using constant heating rate dilatometry data based on the combined-stages sintering model. The present research was taken to predict and control microstructural evolution with densification of TiO2 ceramics during pressureless sintering. Densification of TiO2 was continuously recorded during heating rate of 2℃/min and 5℃/min. The density continuously determined by dilatometer agreed well with the densities determined by Archimedes method with different heating history. The results show that the MSC, in which the sintered density is a unique function of the integral of a temperature function, over time, is insensitive to the heating path. Quantitative image analysis was used to characterize sintered microstructure as a function of the timetemperature sintering conditions, and to verify the link between sintered density and microstructure. The results demonstrate how MSC theory can be applied to design a reproducible process to fabricate controlled density, microstructure, and property ceramics.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2007年第5期994-997,共4页
Bulletin of the Chinese Ceramic Society
关键词
显微组织
主烧结曲线
烧结
二氧化钛
microstructure
master sintering curve
sintering
titania
