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Diagnostics and Modelling of a Thermal RF Plasma Process Used for the Flash Evaporation of Zirconia Powders
Author(s) -
Buchner P.,
Schubert H.,
Uhlenbusch J.,
Weiβ M.,
Willée K.
Publication year - 1999
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.1999.tb08776.x
Subject(s) - plasma , flash evaporation , evaporation , thermal , plasma diagnostics , cubic zirconia , materials science , plasma parameters , particle (ecology) , analytical chemistry (journal) , computational physics , mechanics , chemistry , atomic physics , thermodynamics , ceramic , physics , composite material , nuclear physics , oceanography , chromatography , geology
The evaporation process of zirconia powders injected in a thermal RF plasma is investigated. Both model calculations and experimental techniques such as Optical Emission Spectroscopy (OES) and Laser Doppler Anemometry (LDA) are used to study the evaporation behaviour. Gas temperatures and velocity distributions are determined numerically from conservation laws and Maxwell equations. The influence of plasma and particle parameters on the thermal interaction of injected particles is discussed. Asymmetric Abel inversion is applied to detect asymmetric emission profiles in the plasma source. Spectroscopic measurements reveal that evaporated zirconia is concentrated near the axis of the plasma. Numerical calculations show that line‐integrated emission profiles can be used to distinguish the cases of complete and incomplete evaporation. LDA measurements of the particle velocity distribution show good agreement with the results achieved with modelling.