AN INVESTIGATION OF THE EFFECT OF WORKING GAS TYPE ON MORPHOLOGICAL FEATURES OF THE DEPOSITED LAYERS ON A STEEL ALLOY PRODUCED BY IMPULSE PLASMA DEPOSITION TECHNIQUE

Document Type : Original Article

Authors

Egyptian Armed Forces.

Abstract

ABSTRACT
This paper is concerned with the nature and morphology of deposited Carbon - Alumina
coatings produced under various discharging conditions of the Impulse Plasma
Deposition (IPD) process. The deposition of the coating material was carried out on a
non-heated steel substrate by means of plasma pulses generated from a coaxial
plasma gun. The pulsed plasma mainly consists of two kinds of ions: working gas ions
and inner electrode ions. Coatings were produced by a number of plasma pulses (50 -
200) from 15.42 μF capacitor bank at 13.5 kV discharging voltage. The microstructure
of the deposited films was observed using scanning electron microscope (SEM).
Structural features were greatly affected by the type of the working gas which controls
the ionization potential. Using the Acetylene (C2H2) only as a working gas produces a
layer of graphite and coarse alumina particles (AL2O3) with non uniform distribution.
Mixing the used gas with a molecular gas (either N2 or H2) enhances the ionization and
gives more uniform distribution of finer alumina particles.

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