|About this Abstract
||Materials Science & Technology 2012
||Novel Sintering Processes and News in Conventional Sintering and Grain Growth
||Use of Grain Boundary Complexion Transitions as a Diagnostic Tool in Predicting the Sintering Behavior and Reactivity of Industrial Grade Alumina Ceramics
||Charles Compson, Erik Koep, Marcel Spreij, Donald Carpenter, Abigail Kremer Lawrence, Jeffrey Biser, Animesh Kundu, Martin Harmer, Eric Weiss
|On-Site Speaker (Planned)
This study was aimed at obtaining a better understanding of the fundamental mechanisms and driving forces governing the sintering reactivity and behavior of 99.7-99.9% aluminas. It involved testing a hypothesis that the “reactivity” of a powder is governed in part by its predisposition to forming particular types of grain boundary complexions. The term complexion refers to an interface-stabilized equilibrium phase that is thermodynamically stabilized by its adjoining grains. Complexion phases are chemically and structurally distinct from any bulk phases and can be represented on complexion phase diagrams analogous to bulk phase diagrams. Four different grades of alumina powders of varying impurity levels were studied and compared. High-density samples were prepared by SPS and then annealed for various times and temperatures between 1250°C and 1750°C. The grain size distributions were measured, and grain boundary complexion transitions were identified and related to those reported in the literature.