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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v6.i4.60
22 pages

CHOICE OF AN IR PYROMETER TO MEASURE THE SURFACE TEMPERATURE OF A COATING DURING ITS FORMATION IN AIR PLASMA SPRAYING

Michel Vardelle
LMCTS-URA 320, University of Limoges, 123 Avenue Albert Thomas -87060 Limoges Cedex - France
Thierry Renault
Laboratory Sciences of Ceramic and Surface Treatment Processes (SPCTS UMR-CNRS 6638) - 123, avenue Albert Thomas 87060 Limoges Cedex - France; Thermadyne Inc. 82 Benning Street, West Lebanon, NH 03784, USA
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

ABSTRACT

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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