STRUCTURAL AND MORPHOLOGICAL CHARACTERISTICS OF PLASMA SPRAYED TiO2 -COATINGS

Abstract

STRUCTURAL AND MORPHOLOGICAL CHARACTERISTICS OF PLASMA
SPRAYED TiO2
-COATINGS. TiO2
thin layers have been deposited on glass substrates using Plasma Spray
technique. The TiO2
starting powders are a laboratory grade commercial powders. Before spraying, to check
the availability of the basic material for Plasma Spray technique, a series of characterization was conducted.
The TiO2
starting powders were identified its particle size using Particle Size Analyzer (PSA) resulting
diameter at 90% was 42.72 m. X-Ray Diffractometer (XRD) measurement was done to identify the peaks of
the basic material elements using K radiation at wavelength 1.5406 Å resulted TiO2
of Anatase structure.
Spray dry process was then conducted in order to get circular and free flowing particles for feedstock of plasma
spray system. Distribution of particles showed a dominat of 20 m diameter-free flowing particle. Plasma
Spray process of TiO2
powder furthermore was conducted on slide glass microscope under several parameter
conditions such as power, flame-substrate distance and preheating treatment variation. The TiO2
/glass coatings
with variation of flame-substrate distance (10 and 12 cm) resulted in 5.806 m and 4.913 m layer thickness
with grain size in the range of 0.8-2 m and 1-2.8 m, respectively. XRD diffractogram results revealed that the
TiO2
layer are dominat in rutile phase but at a little higher of plasma power, low anatase phase existed. The
preheated-plasma sprayed TiO2
coatings were visibly difussed into the glass substrate and resulted in dominat
rutile phase (at 2 cycles preheating) but not existed in a longer preheating time (4 cycles preheating treatment).