High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes) An International Journal

ISSN for PRINT: 1093-3611

For Online Access

Best Paper Award Selection - Editorial Board Site

2002, Volume6

Issue 4

125 pages

Issue price - $144.00

Michel Vardelle
Laboratory Science of Ceramic and Surface Treatment Processes (SPCTS) XJMR-CNRS 6638 Faculty of Sciences - Univ. of Limoges 123 A. Albert Thomas 87060 Limoges Cedex, France

Th. Renault
Laboratory Sciences of Ceramic and Surface Treatment Processes (SPCTS UMR-CNRS 6638) - 123, avenue Albert Thomas 87060 Limoges Cedex - France

Pierre Fauchais
Laboratoire Sciences des Precedes Ceramiques et de Traitements de Surface, UMR 6638 CNRS-Universite de Limoges, faculte des Sciences et Technique, conventionne avec le CEA n° M08, France

To obtain reproducible and reliable plasma sprayed coatings, it is mandatory to achieve an on-line control of a few well chosen parameters. Among them the substrate and coating surface temperature time evolution, is a key parameter. To measure it, IR pyrometers are used. The aim of this paper is to determine in which wavelength range the pyrometric measurement will not be disturbed by the direct or reflected radiation of the plasma jet, the radiation of hot particles in flight and at last the absorption by the CO₂ or H₂O contained in the surrounding atmosphere. Measurements and calculations performed in the 2 to 14 mm wavelength range, have shown that in the 8 - 14 mm range, the thermal radiation emitted by the in-flight particles and the plasma jet and its plume are negligible as well as the absorption by the surrounding atmosphere. Measurements close to the sprayed spot, have been performed continuously during spraying and have demonstrated the feasibility and the interest of such a pyrometer.

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