Preliminary exploration of the deposition time compensation of APPJ direction to thickness of SiO2 electrical insulation coating

Abstract

SiO₂ coatings are deposited on the stainless steel plate by atmospheric pressure plasma jet (APPJ) technology. APPJ direction changes from gravity direction to anti-gravity direction, by which to simulate SiO₂ coatings deposited on the inner wall of pipes. The results show that SiO₂ coatings are amorphous structure with about 10 MΩ/μm electrical insulation resistance. APPJ direction has little influence on above properties. While, the deposition rate of SiO₂ coatings is influenced by APPJ direction. The loss of desorbed SiO₂ partials increases with the increase of angle between APPJ and gravity directions, which decreases the deposition rate of SiO₂ coatings. In order to deposit SiO₂ coatings on the inner wall of pipes with uniform thickness, the deposition time compensation ratio is also calculated, which display the complex parabola structure. With the deposition time compensation, APPJ technology will be the potential one to deposit SiO₂ coatings on the inner wall of pipes.