|About this Abstract
||Materials Science & Technology 2012
||MS&T'12 Poster Session
||E30: Characterization of Alumina Powders during Compaction Using In-Situ Electrical Measurements
||Timothy Pruyn, Rosario Gerhardt
|On-Site Speaker (Planned)
A non destructive method for characterizing ceramic compacts still in their green state would allow for monitoring quality control that is typically only possible after the powders have been fully compressed and/or sintered. A custom made die that had an insulating inner sleeve was used to carry out impedance spectroscopy measurements. In this study we evaluated the electrical response of ceramic compacts during dry pressing as a function of applied pressure. Micron and nanosized Al2O3 powders were used for the experiments along with combinations of the two. This method allows for the determination of the contributions of the bulk powders, the interfaces, and the porosity to be identified. Both the presence of adsorbed moisture coating the particles as well as the purity of the powders were shown to have a dramatic influence on the impedance behavior.
||Definite: A CD-only volume