OXIDATION BEHAVIOUR OF NEW COMPOSITENiAl-TYPE COATINGS MODIFIEDWITH DISPERSED Gd_2O_3
LI Tiefan;MA Xinqing Institute of Corrosion and Protection of Metals; Corrosion Science Laboratory; Academia Sinica; Shenyang
Cite this article:
LI Tiefan;MA Xinqing Institute of Corrosion and Protection of Metals; Corrosion Science Laboratory; Academia Sinica; Shenyang. OXIDATION BEHAVIOUR OF NEW COMPOSITENiAl-TYPE COATINGS MODIFIEDWITH DISPERSED Gd_2O_3. Acta Metall Sin, 1991, 27(1): 102-107.
Abstract Studies were made of the influences of the nature of Gd_2O_3 and itscontent on the oxidation behaviour in air at 1100℃ of the NiAl-type compositecoatings modified with dispersed Gd_2O_3, which were prepared by co-electrodeposi-tion and diffusion aluminizing techniques. In comparison with Gd_2O_3-free coatings,the oxidation of the modified coating may be remarkably retarded and their scalesadherence to substrate may be much improved. It was revealed that some Gd_2O_3 par-ticles are still dispersed in the coatings, but other sub-microscopical Gd_2O_3 particl-es are accumulated at the coating/substrate interface just after aluminizing. Theaccumulated layer is found as the diffusion barrier. A continuous Gd_2O_3 particlelayer would be more effective to reduce the degradation and to prolong the life ofthe coatings.
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