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Al 2 O 3 diffusion barriers of various thicknesses have been fabricated by filtered arc ion plating between the NiCrAlY coating and the O-Ti 2 AlNb alloy. Isothermal oxidation tests and three-point bend tests have been conducted to investigate the influence of the Al 2 O 3 diffusion barriers on the oxidation and interfacial fracture behaviour of the coatings...
Ion-plated Al–Al 2 O 3 cermet films were fabricated as diffusion barriers between NiCrAlY coating and orthhombic-Ti 2 AlNb alloy. The oxidation and interdiffusion behaviour of coatings with and without diffusion barrier were investigated in isothermal and cyclic oxidation tests at 800°C. The results indicated that substantial interdiffusion and rapid oxidation degradation occurred...
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