A New Approach to Ceramic Liquid-Phase Sintering Paradigms

陶瓷液相烧结范例的新方法

• 批准号: 9207897
• 负责人: W. David Kingery
• 金额: $ 2.5万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-06-15 至 1993-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9207897&HistoricalAwards=false
• 关键词: New; Approach; Ceramic; Liquid; Phase

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.

在“旧”的等温变化的主要假设 液相烧结模型不适合实际 处理。 该项目建议使用传输 电子显微镜（TEM）观察实际的纳米 事件 将利用观测到的TEM资料来改变“旧” 由Kingery在1959年开发的定量表达式。 显微结构变化和变化率的观察 在加热过程中，重点是材料 将进行分配和分配变更。 定量 表达式将制定的过程中， 加热过程中添加剂。 这些过程发展 最终进入液相烧结。 研究将开始， Al_2O_3-TiO_2系统。 %%%% 该项目研究了加热过程中存在的 活跃分子。 将进行纳米尺度的显微观察 微观结构的变化及其变化率， 强调材料分配和分配变化。 的 研究始于这样一个假设，即焦点应该在 边界的分布、结晶度和性质， 表面“相”，其存在允许加速材料 转移 这项研究挑战了定量的应用， PI多年前开发的表达。 本研究旨在 发展新的表达方式， 不仅在陶瓷领域， 加工，而且在陶瓷科学以及在粉末 冶金.