Aluminization of a Si–Y co-deposition coating to protect a Ti2AlNb based alloy from high temperature oxidation

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

“…Fabrication of Si-Al, Al-Y, and Si-Al-Y layers on TiAl alloys have been shown to produce a series of different intermetallic layers (e.g., aluminide and silicide) and oxide layers, increasing the oxidation resistance of the coated alloys [227][228][229][230][231][232]. In particular, J. Xiang et al [232] Platinum aluminide coatings seem to protect the titanium alloys from oxidation as well as from hot corrosion, preventing the formation of the alpha phase. In ref.…”

“…They observed an excellent oxidation resistance of the Ti alloys up to 800 • C, thanks to Pt, which effectively promotes continuous alumina scale formation during high temperature exposure. Fabrication of Si-Al, Al-Y, and Si-Al-Y layers on TiAl alloys have been shown to produce a series of different intermetallic layers (e.g., aluminide and silicide) and oxide layers, increasing the oxidation resistance of the coated alloys [227][228][229][230][231][232]. In particular, J. Xiang et al [232] coated a Ti alloy by means of Si-Y co-deposition and aluminization, which, due to inward diffusion of Al atoms and outward diffusion of Ti and Nb atoms, gave rise to the formation of different mixed intermetallic layers and promoted the preferential development of Al2O3 on the surface in spite of the less resistant TiO2 oxide.…”

“…Fabrication of Si-Al, Al-Y, and Si-Al-Y layers on TiAl alloys have been shown to produce a series of different intermetallic layers (e.g., aluminide and silicide) and oxide layers, increasing the oxidation resistance of the coated alloys [227][228][229][230][231][232]. In particular, J. Xiang et al [232] coated a Ti alloy by means of Si-Y co-deposition and aluminization, which, due to inward diffusion of Al atoms and outward diffusion of Ti and Nb atoms, gave rise to the formation of different mixed intermetallic layers and promoted the preferential development of Al2O3 on the surface in spite of the less resistant TiO2 oxide. In a work by K. Bobzin et al [230], different coatings based on Si-Al and Si-Al-Y were deposited and tested on TiAl, showing an enhanced oxidation resistance thanks to Si and Y addition, promoting the formation of α-Al2O3, YAlO3, and a continuous intermetallic scale of TiSi, with consequent suppression of inward oxidation and outward Ti diffusion.…”

High temperature oxidation behaviors of Al/Cr composite coating on Ti2AlNb alloy

“…J J Dai et al [6] reported that operating temperature above 873 K, the conventional titanium alloys were oxidized and brittle oxides (TiO 2 , AlNbO 4 and so on) with porous structure were formed on the alloy surface, which was unfavorable for the application of alloys. The oxygen-containing and nitrogen-containing products are advantageous to the subsurface brittleness [7,8]. Thus, searching a method to enhance the oxidation resistance of Ti 2 AlNb alloy, which is significant to the application of Ti 2 AlNb alloy at high temperature.…”

“…To obtain the stable application, many efforts are been made though different preparation methods [14]. Lots of methods have been used to deposition protective coating on Ti 2 AlNb alloy, including laser melting, plasma spraying, and magnetron sputtering etc [7,15,16]. Magnetron sputtering technique is effective method to fabricate various kinds of coatings, which employ ions with high ionization of argon gas to strike target and beneficial elements was deposited on the substrate surface [17].…”