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Diameter of plasma jet without powder and shroud. 66 x 31 mm
(300 x 300 dpi).
although difficult to achieve using a commercial <80 kW plas-
ma torch. In this study, a shroudedplasma torchwas examined
to improve YSZ evaporation. Plasma characteristics were diag-
nosed using optical emission spectroscopy. Results show that
electron number density in the plasma jet was maintained at
an order of magnitude of 1014 cm-3, which indicate local ther-
mal equilibrium of the plasma jet. Compared to a convention-
al torch, the shrouded torch results in a much higher plasma
temperature and much lower electron number density. With
the shrouded torch, more plasma energy was transferred to
YSZ material leading to increased evaporation of YSZ powder
and thereby a much higher deposition rate. Results show that
using a shrouded torch is a simple and effective approach to
improve the evaporation of feedstockmaterial during PS-PVD.
Surface morphology of Y2 SiO5 powders.
at 45 kW are 2.6 μm/s and 0.031 mg•cm -2•s-1 in the heat flux
of 2.38 MW/m 2 under oxyacetylene torch. During ablation,
a glassy layer of SiO 2+Y2O3 was formed, acting as a barrier to
high-speed gas flow of oxyacetylene flame.
“CHARACTERIZATION OF PLASMA JET IN
PLASMA SPRAY-PHYSICAL VAPOR DEPOSITION
OF YSZ USING A <80 KWSHROUDED TORCH
BASED ONOPTICAL EMISSION SPECTROSCOPY”
Qing-Yu Chen, Xiao-Zhuang Peng, Guan-Jun Yang,
Cheng-Xin Li, Chang-Jiu Li
During plasma spray-physical vapor deposition (PS-PVD)
of YSZ coatings, the evaporation of YSZ powder is essential,
PS-CITS Pro 2014-HalfPg-final.indd 1 5/16/14 2:08 PM