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Temperature Distribution in Microwave Sintering of Alumina Cylinders

Published online by Cambridge University Press:  15 February 2011

J. R. Thomas Jr ,
Joel D. Katz  and
Rodger D. Blake
J. R. Thomas Jr
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
Joel D. Katz
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
Rodger D. Blake
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

Small cylinders of high-purity alumina were encased in a “casket” of low-density zir-conia insulation and heated to sintering temperature in a large multi-mode microwave oven. Optical fiber sensors were used to monitor the temperature at several locations in the system. It was found that the alumina samples heat faster than the zirconia insulation at temperatures above 1000°C, and that the temperature distribution in the sample is essentially uniform during the heating process.

A two-dimensional mathematical model of the heat transfer process was developed which reproduces the essential features of the observed phenomena. Literature data for all temperature-dependent properties were incorporated into the model. The model suggests that the alumina samples absorb a significant fraction of the microwave energy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 347: Symposium O – Microwave Processing of Materials IV , 1994 , 311
Copyright
Copyright © Materials Research Society 1994

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