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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
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.v15.i2.10
pages 87-95

CHARACTERISATION OF AL2O3 PLASMA SPRAYING BY ATOMIC EMISSION SPECTROSCOPY AND NEAR INFRARED PYROMETRY

Ph. Bertrand
C. N. R. S., Institut de Science et de Genie des Materiaux et Procedes B. P. 5, Odeillo, F-66125 Font-Romeu Cedex
J. M. Badie
C. N. R. S., Institut de Science et de Genie des Materiaux et Procedes B. P. 5, Odeillo, F-66125 Font-Romeu Cedex
I. Yu. Smurov
C. N. R. S., Institut de Science et de Genie des Materiaux et Procedes B. P. 5, Odeillo, F-66125 Font-Romeu Cedex; Ecole Nationale d'Ingenieurs de Saint-Etienne, 58 rue Jean Parot, 42023 Saint -Etienne Cedex 2, France
G. Colonges
Projection Plasma Systeme, Z.I. du Colombier, BP 4, 12220 Montbazens

ABSTRACT

Plasma temperature measurement and 2D light intensity mapping of an industrial plasma spraying equipment developed by 2PS (14−45 kW, Ar/H2 plasma, Al2O3 powder) is performed based on atomic emission spectroscopy and near infrared pyrometry. The influence of the process parameter variations onto the plasma electron density with and without Al2O3 powder has been identified. Plasma temperature and electron density are determined by Atomic Emission Spectroscopy (a monochromator with focal length of 320 mm is used, allowing spectra acquisitions on a wide spectral range up to 70 nm) based on the H-beta line broadening in the assumption of plasma equilibrium. A 2D pyrometer (vision zone 10 × 10 mm2) with the 0.860 μm spectral band has been applied to obtain the radiative intensity mapping of the jet. A 1 spot monochromatic pyrometer (in the 1.5 μm spectral range) sighted to the impact area has been used to control in real time the substrate brightness temperature versus process parameters. The following variations of operational conditions were studied: hydrogen flow rate (0 − 15 l/min), powder flow rate (10 − 20 g/min) and current (500 − 700 A), argon flow rate was fixed (70 1/min). It has been found that along the jet axis (up to 40 mm from the nozzle) the temperature and the electron density vary in the range 13,000 − 11,000 K and 1.4 × 1017 − 4 × 1016 cm−3, respectively. The 2D radiation intensity fields are rather sensitive to the variation of current and H2 flow rate and visualize the plasma flow pattern.

REFERENCES

  1. Landes, K., Diagnostics and on-line-control of a plasma spraying process.

  2. Vardelle, M., Vardelle, A., Fauchais, P., and Moreau, C., Pyrometer system for monitoring the particle impact on a substrate during plasma spray process.

  3. Griem, H. R., Spectral Line Broadening by Plasma.

  4. Ignatiev, M., Smurov, I. Y., Flamant, G., Senchenko, V., and Dozhdikov, V., Two-dimensional resolution pyrometer for real-time monitoring of temperature image in laser materials processing.

  5. Ignatiev, M., Smurov, I., Flamant, G., Senchenko, V., Dozhdikov, V., and Bertrand, P., High speed pyrometers for temperature measurements in laser material treatment.


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