A New Approach to Ceramic Liquid-Phase Sintering Paradigms

“旧”液相烧结模型中关于等温变的主要假设不适用于实际工艺。本项目提出使用透射式电子显微镜来观察实际的纳米事件。观测到的透射电子显微镜数据将被用来改变金格里在1959年发展的“旧的”定量表达式。将观察加热过程中的微观结构变化和变化速率，重点是材料分布和分布的变化。对于添加剂加热过程中的过程，将建立定量的表达式。这些过程最终发展为液态烧结。研究将从Al_2O_3-TiO_2系统开始。%这个项目研究了活性物质存在时的升温过程。将在纳米尺度上对微观结构的变化及其变化率进行微观观察，重点是材料的分布和分布的变化。这项研究首先假设焦点应该放在晶界和表面“相”的分布、结晶度和性质上，这些“相”的存在是为了加速物质的转移。这项研究挑战了PI多年前开发的定量表达式的应用。这项研究旨在开发新的配方，不仅在陶瓷加工方面，而且在陶瓷科学和粉末冶金方面，都将对快速和创新的进展产生深远的影响。

The major assumption of isothermal changes in the "old" liquid-phase sintering model is notsuitable for the actual processings. This project proposes to use the transmission electron microscope (TEM) to observe the actual nanometer events. The observed TEM data will be used to change the "old" quantitative expressions as developed by Kingery in 1959. Observations of microsctructural changes and rates of change during the heating-up process, with emphasis on material distribution and distribution changes, will be made. Quantitative expressions will be formulated for the processes during the heating-up process with additives. These processes develop ultimately into liquid-phase sintering. The study will begin with the Al2O3-TiO2 system. %%%% This project examines the heating-up process with the presence of actives. Microscopic observations in nanoscales will be made of the microstructural changes and their rates of change with emphasis on material distribution and distribution changes. The study begins with the hypothesis that the focal point should be on the distribution, crystallinity, and properties of boundaries and surface "phases", which are present to allow acclerated material transfer. This study challenges the applications of the quantitative expressions the PI developed many years ago. This study aims to develop new expressions which will have a profound effect in catalyzing rapid and innovative advances, not only in ceramic processing, but also in ceramic sciences as well as in powder metallurgy.