|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||033 Characterization of Ceramic Powders during Compaction Using Electrical Measurements
||Timothy Pruyn, Rosario Gerhardt
|On-Site Speaker (Planned)
The use of ceramic composites with percolated segregated microstructures of conductive filler has numerous potential applications. Our focus is to optimize the green state of ceramic compacts by minimizing the conductive filler needed for percolation. In this study we evaluated the electrical response of ceramic compacts during dry pressing as a function of applied pressure. Semiconductive SiC and insulating Al2O3 powders were used for the experiments. A custom made die with an insulating outer sleeve was used to carry out dc and ac measurements. Measurements were performed in situ as a function of loading and unloading compaction pressure. Dc measurements can only detect the combined response from the powders and the porosity. However, from the complex impedance plot, at least two semicircles were observed. One of these semicircles represents the bulk material property, while the other is likely due to the void space and interfaces.