Details

IMPEDANCE RESPONSE OF ALUMINA-SILICON CARBIDE WHISKER COMPOSITES

by Mebane, David Spencer

Abstract (Summary)
The impedance response of silicon carbide whisker-alumina composites is investigated utilizing novel stereological techniques along with a microstructural simulation. The stereological techniques developed allow for a measurement of the trivariate length, radius and orientation distribution of whiskers in the composite from measurements made on two-dimensional sectioning planes. The measured distributions are then utilized in a Monte Carlo simulation that predicts connectivity in the composite for a given volume fraction. It is assumed in the simulation that connectivity factors dominate the electrical response, not interfacial phenomena. The results of the simulation are compared with impedance spectra taken from real samples, and conclusions are drawn regarding the nature of the impedance response.
Bibliographical Information:

Advisor:Hamid Garmestani; Arun M. Gokhale; Rosario A. Gerhardt

School:Georgia Institute of Technology

School Location:USA - Georgia

Source Type:Master's Thesis

Keywords:materials science engineering

ISBN:

Date of Publication:12/08/2004

© 2009 OpenThesis.org. All Rights Reserved.