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Atmospheric pressure high-power impulse plasma source for deposition of metallic coatings

Published online by Cambridge University Press:  04 June 2019

Vasiliki Z. Poenitzsch ,
Ronghua Wei ,
Michael A. Miller  and
Kent E. Coulter
Vasiliki Z. Poenitzsch*
Affiliation:
Materials Engineering Department, Southwest Research Institute, San Antonio, Texas 78238, USA
Ronghua Wei
Affiliation:
Materials Engineering Department, Southwest Research Institute, San Antonio, Texas 78238, USA
Michael A. Miller
Affiliation:
Materials Engineering Department, Southwest Research Institute, San Antonio, Texas 78238, USA
Kent E. Coulter
Affiliation:
Materials Engineering Department, Southwest Research Institute, San Antonio, Texas 78238, USA
*
a)Address all correspondence to this author. e-mail: vicky.poenitzsch@swri.org
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Abstract

A novel high-power impulse plasma source (HiPIPS) technology that combines atmospheric pressure plasma jets with high-power pulsed direct current generators is described. Pulsed power is applied in microsecond pulses (20 µs) at low duty cycle (10%) and low frequency (0.5 kHz) leading to high peak power densities (10–75 kW) and high peak currents (100–250 A) while maintaining low average power (<40 W) and low processing temperatures (<50 °C). These conditions result in the generation of a highly dense plasma discharge (ne = 6.23 × 1016 cm−3) for surface modification and deposition of coatings. Using HiPIPS, Ar-initiated metallic Ti, CoCr, or Ti–6Al–4V plasma was generated, and the plasma properties were characterized by measuring current–voltage characteristics, electron densities (Langmuir probe), and optical emission spectra. HiPIPS CoCr and Ti–6Al–4V coatings were deposited for proof of concept of the technique. The resulting coatings were examined with scanning electron microscopy, energy-dispersive X-ray spectroscopy, and nanoindentation.

Keywords

coatingplasma depositionmetal
Type
Invited Feature Paper
Information
Journal of Materials Research , Volume 34 , Issue 12 , 28 June 2019 , pp. 2078 - 2085
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

This paper has been selected as an Invited Feature Paper.

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