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Advances in Heat Transfer Engineering

ISSN:
1-56700-198-1 (Print)

EFFECT OF OUTLET NOZZLE DESIGN ON THE YSZ PARTICLE IN-FLIGHT CHARACTERISTICS IN PLASMA JET GENERATED BY DC PLASMA TORCH

Kristina Brinkiene
Lithuanian Energy Institute, 3 Breslaujos str., LT-3035 Kaunas, Lithuania

Romualdas Kezelis
Lithuanian Energy Institute

Vladas Mecius
Lithuanian Energy institute, Material testing and research laboratory, Breslaujos 3, 44403 Kaunas, Lithuania

Liudas Pranevicius
Vytautas Magnus University, Lithuanian Energy Institute, Kaunas, Lithuania

Abstract

The aim of this paper was to study the melting conditions of commercial yttria stabilised zirconia (YSZ) powder in high velocity air plasma jet. By means of calorimetric probe, the cross-section of outlet jet velocity and temperature profile were measured. The study covers investigations how the spray regime affects the microstructure of obtained YSZ films by using different shapes of plasma torch anode exit mode: Laval-like contour and cylinder. Outlet plasma flow parameters are discussed with respects to melting states of YSZ powder, anode exit mode and coating qualities of deposited films. The results showed plasma torch shape and started powder characteristics to be the most important parameters influencing the film microstructure.