Optimal control of microstructural gradients during composite fabrication

R. Bhatkal, V. Fradkov, K. Kyriakopoulos, H. E. Stephanou, K. Rajan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Microstructural observations of plasma sprayed thick films of nickel and laminated composites of Al2O3/MoSi2, have been made. It is shown that the lack of control of temperature gradients across the thickness of the deposit results in enormous microstructural gradients. Computational algorithms have been developed which trace the development of temperature gradients across the deposit thickness during rapid solidification by plasma processing. Based on reduced order models of heat transfer, a control problem is set up in order to minimize the temperature gradients across the deposit thickness, which consequently results in the desired microstructure and minimum residual stresses. The impact of the lack of such a temperature gradient control on microstructural evolution of the deposit is investigated, and the necessity of temperature gradient control is emphasized.

Original languageEnglish (US)
Title of host publicationProceedings of the International Conference on Advanced Composite Materials
EditorsT. Chandra, A.K. Dhingra
PublisherPubl by Minerals, Metals & Materials Soc (TMS)
Pages1235-1241
Number of pages7
ISBN (Print)0873392515
StatePublished - 1993
EventProceedings of the International Conference on Advanced Composite Materials - Wollongong, Aust
Duration: Feb 15 1993Feb 19 1993

Publication series

NameProceedings of the International Conference on Advanced Composite Materials

Conference

ConferenceProceedings of the International Conference on Advanced Composite Materials
CityWollongong, Aust
Period2/15/932/19/93

ASJC Scopus subject areas

  • General Engineering

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