Author/Authors :
Tang، نويسنده , , Z and Niewolak، نويسنده , , L and Shemet، نويسنده , , V and Singheiser، نويسنده , , L and Quadakkers، نويسنده , , W.J. and Wang، نويسنده , , F and Wu، نويسنده , , W and Gil، نويسنده , , A، نويسنده ,
Abstract :
In this paper the suitability of various coating types for the oxidation protection of γ-TiAl based alloys is discussed. Conventional aluminide and MCrAlY coatings are not suitable as protective coatings for γ-TiAl due to the poor coating–substrate compatibility. A Ti–50Al–10Cr coating remarkably improves the oxidation resistance of γ-TiAl, and exhibits an excellent chemical and physical compatibility with the γ-TiAl substrate. Moreover, the potential suitability of Ti–Al–Cr–Ag alloys as coating system for γ-TiAl was investigated. Alloy Ti–48Al–7Cr–2Ag exhibits excellent oxidation resistance at 800 and 900 °C, and may become a new candidate coating material for γ-TiAl with improved coating toughness.
Keywords :
Oxidation , Magnetron-sputtering , Coating–substrate compatibility , TiAl intermetallics , Coatings
