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Cobalt aluminide coating was deposited onto two directionally solidified Ni-based superalloys (DZ 466 and DS GTD111) by low-pressure chemical vapor deposition. Interdiffusion behaviors of the two coating/superalloy systems were examined during long-term thermal exposure at 1050 °C. It was observed that the inward diffusion of Al and Co from the coating to the substrate and the outward diffusion of...
La 2 Zr 2 O 7 (LZ) and La 2 (Zr 0.7 Ce 0.3 ) 2 O 7 (LZ7C3) as novel candidate materials for thermal barrier coatings (TBCs) were prepared by electron beam-physical vapor deposition (EB-PVD). The adhesive strength of the as-deposited LZ and LZ7C3 coatings were evaluated by transverse scratch test. Meanwhile, the factors affecting the critical...
The formation of diffusion barrier on the Ni-based superalloy substrate by low-pressure pre-oxidation is studied in this paper. The pre-oxidation was carried out by heating the substrate under a low-oxygen partial pressure with electron beam of the electron beam physical vapor deposition (EB-PVD) facility. The effect of diffusion barrier was investigated by both isothermal and cyclic oxidations at...
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