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Automatic Control to Prevent Thermal Runaway During Microwave Joining of Ceramics

Published online by Cambridge University Press:  25 February 2011

Guy O. Beale  and
Francisco J. Arteaga
Guy O. Beale
Affiliation:
Department of Electrical and Computer Engineering, George Mason University, Fairfax, VA 22030
Francisco J. Arteaga
Affiliation:
Department of Electrical and Computer Engineering, George Mason University, Fairfax, VA 22030
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Abstract

A temperature control system is designed and simulated for microwave joining of ceramics. The objective is to develop a control system for reliable, high quality joints to be produced on a variety of ceramics. The described procedure permits the derivation of a closed-loop configuration for controlling temperature. The ceramics (alumina) heating model equation is linearized around an operating point and represented as a transfer function. Conditions for closed-loop stability with any linearized model are presented and mathematically proven. A computer simulation is implemented for the closed-loop control and numerical integration is used for solving the non-linear heating equations. Results are very good and show that the temperature can be regulated to a set point value and thermal runaway in the ceramics can be prevented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 269: Symposium L – Microwave Processing of Materials III , 1992 , 265
Copyright
Copyright © Materials Research Society 1992

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References

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