Abstract
With Y 2 O 3 /CeO 2 powder, instead of part of Al 2 O 3 , acting as filler, Y 2 O 3 /CeO 2 -modified aluminide coatings were produced on Ni based using a conventional pack-cementation method at 600 °C for 10 h. For comparison, a normal aluminide coating was also produced using pure Al 2 O 3 acting as filler. Effect of Y 2 O 3 /CeO 2 in the pack on the alumina phase transformation and cyclic oxidation resistance in air at 1000 °C was investigated. The results indicate that Y 2 O 3 and CeO 2 have different effects on θ-α phase transformation: Y 2 O 3 suppresses the growth of the θ-alumina but CeO 2 promotes the q-a phase transformation. However, compared to the normal aluminide coating, the addition of Y 2 O 3 /CeO 2 significantly improves the cyclic oxidation resistance due to the formation of adherent alumina scale, especially the later. The effects of Y 2 O 3 /CeO 2 on alumina phase transformation and cyclic oxidation resistance were discussed.
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