Evaluation of Oxidation of Ti-Al and Ti-Al-Cr Coatings Arc-ion Plated on Ti-60 High-temperature Titanium Alloy

Abstract

Abstract:

High-temperature titanium alloy for aeroengine compressor applications suffers 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 diffraction (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.

Key words: Oxidation, Ti-48Al coating, Ti-48Al-12Cr coating, High temperature
titanium alloy

Wei Yan,Qingjiang Wang,Jianrong Liu,Shaoqiang Li,Fengjiu Sun. Evaluation of Oxidation of Ti-Al and Ti-Al-Cr Coatings Arc-ion Plated on Ti-60 High-temperature Titanium Alloy[J]. J Mater Sci Technol, 2009, 25(05): 637-644.

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