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High-temperature titanium alloy for aeroengine compressor applications suers from high-temperature oxidation and environmental corrosion,which prohibits long-term service of this kind alloy at temperatures above 600-C.In an attempt to tackle this problem,Ti-48Al(at.pct)and Ti-48Al-12Cr(at.pct)protective coatings were plated on the substrate of alloy Ti-60 by arc ion plating(AIP)method.Isothermal and cyclic oxidation tests were performed in static air at elevated temperatures.Phase composition,morphology of the coatings and distribution of elements were investigated by X-ray di-raction(XRD),scanning electron microscopy (SEM)and energy dispersive X-ray analysis(EDX).The results showed that the Ti-48Al coating exhibited good isothermal oxidation resistance during exposure at 800-C,but poorer resistance against oxidation at 900-C.By contrast Ti-48Al-12Cr coating demonstrated excellent isothermal oxidation resistance at both temperatures. Cyclic oxidation tests performed at 800-C indicated that both coatings demonstrated good cyclic oxidation resistance and no spallation of coatings was observed.But at 900-C only Ti-48Al-12Cr coating demonstrated excellent cyclic oxidation resistance.
High-temperature titanium alloy for aeroengine compressor applications suers from high-temperature oxidation and environmental corrosion, which prohibits long-term service of this kind of alloy at temperatures above 600-C.In an attempt to tackle this problem, Ti-48Al (at. pct) and Ti-48Al-12Cr (at.pct) protective coatings were plated on the substrate of alloy Ti-60 by arc ion plating (AIP) method. Isothermal and cyclic oxidation tests were performed in static air at elevated temperatures. Phase composition , morphology of the coatings and distribution of elements were investigated by X-ray di-raction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The results showed that the Ti- Isothermal oxidation resistance during exposure at 800-C, but poorer resistance against oxidation at 900-C.By contrast Ti-48Al-12Cr coating demonstrated excellent isothermal oxidation resistance at both temperatures. Cyclic oxidation tests performed at 800-C that both of the films demonstrated good cyclic oxidation resistance and no spallation of coatings was observed. At 900-C only Ti-48Al-12Cr coated demonstrated excellent cyclic oxidation resistance.