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Progress in Plasma Processing of Materials, 2003

ISBN:
978-1-56700-192-1 (Print)
978-1-56700-447-2 (Online)

DIAGNOSTICS OF PLASMA SPRAY PROCESS AND DERIVED ON-LINE CONTROL

Pierre Fauchais
Laboratoire Sciences des Procedes Ceramiques et de Traitements de Surface UMR CNRS 6638 University of Limoges 123 avenue Albert Thomas, 87060 LIMOGES - France

J. F. Coudert
Laboratoire Sciences des Procédés Céramiques et Traitements de Surface, UMR-CNRS 6638, Université de Limoges, 87060 Limoges Cedex, France

Michel Vardelle
LMCTS-URA 320, University of Limoges, 123 Avenue Albert Thomas -87060 Limoges Cedex - France

Abstract

This paper summarizes what are the measuring techniques used in plasma spraying to characterize
- plasma jets and their fluctuations: emission spectroscopy, laser scattering spectroscopy, enthalpy probes coupled to mass spectroscopy and fast cameras,
- particles in flight in plasma jets: laser doppler anemometry, Phase Doppler Anemometry, fast two-color pyrometer, laser fluxmetry, hot particles light emission ...
- particles at impact: fast pyrometry and fast cameras,
- substrate and coating temperature: IR pyrometry and IR thermography.
The new set-ups to achieve an on-line control, on more precisely a monitoring of the spray process are also presented: DPV2000, Accuraspray, Plumespector, Spray watch, CCD cameras, SDC.