Research Status of Aluminum Base Coating on Titanium Alloy

Abstract

At present, in the aviation industry, titanium alloy is mainly used to manufacture parts such as compressor discs, blades, and the casings of aircraft engines. When titanium alloys are in service, high temperature is generated due to high-speed running friction, which requires them to have high-temperature oxidation resistance and friction resistance. If they are used in an environment with salt corrosion, titanium alloys will face thermal corrosion, which limits their wider practical applications. At present, there are many methods to protect titanium alloys. This paper mainly includes alumina-based coatings and some preparation methods. The characteristics and functional mechanisms of three functional coatings for the service environment, namely highly temperature-resistant alumina-based coating, thermal corrosion-resistant alumina-based coating, and wear-resistant alumina-based coating, are summarized. Finally, the development direction of composite coatings of titanium and titanium alloys for a complex service environment is suggested.

High-temperature coatings for titanium alloys

“…Other elements that are added to the aluminide system include Cr, Pt and Nb. 7 Silicide coatings have been used to protect titanium alloys from wear due to their low density and high microhardness. Several deposition techniques have been developed, including methods such as powder siliconising, 8 laser surface alloying 9 and ion implantation.…”