摘要
通过对ZrO_2-Y_2O_3纳米级粉末烧结动力学过程的研究,分析了陶瓷的致密化机理。实验结果表明:超细粉末在烧结初期,晶界扩散起主要作用。在存在团聚体的粉末中,由于团聚体与基体间界面应力的相互作用,致使烧结体的密度降低,影响了陶瓷的显微结构,从而限制了在烧结后期获得细晶粒的陶瓷体。对于无团聚体的粉末,通过烧结过程中晶粒生长过程的控制,可获得相对密度达98.5%(1250℃保温2h),且晶粒尺寸仅为160nm的Y-TZP陶瓷体。
This paper is about the densification mechanism of ultrafine ZrO_2-Y_2O_3 powder. The experimental resultsshowed that grain boundary diffusion played an important role in the initial stage of sintering. The effects ofagglomerates on the densification process were analyzed. It was found that the interaction of the interface stressbetween the agglomerate and matrix decreased the density of the agglomerates and influenced the microstructureas well as prevented the potential growth of fine erystallites in the final stage of sintering. Agglomerate-freepowder was sintered to attain 98.5% of theoretical density at 1250℃ for 2h when the resulting grain size was only 160nm.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1992年第1期35-41,共7页
Journal of The Chinese Ceramic Society
关键词
烧结
超细粉未
氧化锆
陶瓷粉未
sintering mechanism
ultrafine powder
zirconia
