Diagnostics of thermal spraying plasma jets

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Journal of Thermal Spray Technology; (United States)

DOI:https://doi.org/10.1007/BF02659011· OSTI ID:6907375

Fauchais, P; Coudert, J F; Vardelle, M; Vardelle, A; Denoirjean, A ^[1]

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1. Limoges, Universite, (France)

The development of diagnostic techniques for dc plasma spraying is reviewed with attention given to the need for thick highly reproducible coatings of good quality for aeronautic and other uses. Among the techniques examined are fast cameras, laser-Doppler anemometry (LDA), coherent anti-Stokes Raman spectroscopy (CARS), enthalpy probes, and emission spectroscopy. Particular emphasis is given to the effect of arc fluctuations on the spectroscopic measurements, and a method is introduced for obtaining temperature and species density of vapor clouds traveling with each particle in flight. Coating properties can be deduced from data on single particles, and statistical approaches are often unreliable without added data on surface temperature and particle velocity. Also presented is a method for deriving the temperature evolution of a cooled splat and successive layers and passes. These methods are of interest to the control of adhesion and cohesion in coatings for critical aerospace applications. 70 refs.

• OSTI ID: 6907375
• Journal Information: Journal of Thermal Spray Technology; (United States), Journal Name: Journal of Thermal Spray Technology; (United States) Vol. 1:2; ISSN 1059-9630; ISSN JTTEE5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360100* -- Metals & Alloys
360200 -- Ceramics
Cermets
& Refractories
360600 -- Other Materials
ANEMOMETERS
COATINGS
CONTROL
DEPOSITION
DIAGNOSTIC TECHNIQUES
HOT PLASMA
LASER SPECTROSCOPY
MEASURING INSTRUMENTS
PLASMA
PLASMA ARC SPRAYING
PLASMA DIAGNOSTICS
PLASMA JETS
PROCESS CONTROL
RAMAN SPECTROSCOPY
SPECTROSCOPY
SPRAY COATING
SPRAYED COATINGS
SURFACE COATING