EFFECT OF CoCrAl COATING ON OXIDATION RESISTANCE OF INTERMETALLIC COMPOUND TiA1

Abstract

Abstract: Effect of a sputtered Co-30Cr-5Al microcrystalline coating on oxidation resistance of intermetallic compound TiAl and oxidation behavior of the bare TiAl were investigated at 900—1000℃ in static air.The oxidation kinetics for the TiAl alloy seems to approximately follow a linear rate law.Poor oxidation resistance of TiAl is due to the formation of the mixed Al_2O_3+TiO_2 scale which is loosely packed and easily spalled off.but not of dense and adherent pure Al_2O_3.A sputtered Co-30Cr-5Al coating,30 μm thickness,can remarkably improve the oxidation resistance of TiAl owing to the formation of adherent Al_2O_3 protective scale.However,many Kirkendall voids were formed between coating and substrate.

Key words: CoCrAl microcrystalline coating, TiAL, oxidation, void

WANG Fuhui LOU Hanyi WU Weitao Corrosion Science Laboratory,Institute of Corrosion and Protection of Metals,Academia Sinica,Shenyang,China associate professor,Institute of Corrosion and Protection of Metals,Academia Sinica,Shenyang 110015,China. EFFECT OF CoCrAl COATING ON OXIDATION RESISTANCE OF INTERMETALLIC COMPOUND TiA1[J]. Acta Metallurgica Sinica (English Letters), 1993, 6(11): 331-336.

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EFFECT OF CoCrAl COATING ON OXIDATION RESISTANCE OF INTERMETALLIC COMPOUND TiA1

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