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Progress in Plasma Processing of Materials, 2003

ISBN Print: 978-1-56700-192-1

ISBN Online: 978-1-56700-447-2

DIAGNOSTICS OF PLASMA SPRAY PROCESS AND DERIVED ON-LINE CONTROL

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.
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