A comparison of low-pressure arc and low-pressure plasma sprayed titanium coatings

Abstract

Titanium coatings for protection in chemical plants are required to withstand severe corrosion attack. Low-pressure plasma spraying (LPPS) and low-pressure arc spraying (LPAS) of titanium were investigated as a means of producing such coatings. Metallographic, mechanical examination, and x-ray diffraction analyses of titanium coatings arc and plasma sprayed in a low pressure atmosphere, show that both coatings are dense and nearly free of contaminating phases. However, results of the comparison show that low-pressure arc sprayed titanium coatings had lower hardness, lower interstitial gas content, higher bond strength with the substrate, and were sprayed with higher efficiency than the low-pressure plasma sprayed titanium coatings.