발간논문

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Vol.38, No.8, 1053 ~ 1062, 2000
Title
The Effect of Nb and Cr on the Diffusion Coating of TiAl for Improvement of Oxidation Resistance
정환교Hwan Gyo Jung,오창혁Chang Hyeok Oh,김규영Kyoo Young Kim
Abstract
The effects of alloying elements in the TiAl₃ coating layer are studied with respect to mechanical property and oxidation resistance. All the TiAl alloys are pack aluminized in the same condition of high activity process. The mechanical property of TiAl₃ coating layer formed on the surface by pack aluminizing depends considerably on the third alloying element in the TiAl matrix. The TiAl₃ layer formed on the TiAl alloy becomes thicker and has the finer micostructure as the content of Nb or Cr is increased. Micnhardness test reveals that addition of alloying element of Nb or Cr improves the ductility of the coating layer and thus improves the cracking resistance. Cyclic oxidation test shows that the TiAl₃ coating layer formed on the TiAl alloy has a better oxidation resistance as the content of Nb is increased. The ductility and oxidation resistance of the TiAl₃ coating layers are increased by Nb addition, which contributes to the grain refinement of TiAl₃ structure.
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