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The influence of yttrium on the Oxidation behaviour of Ni-23Co-19Cr-12Al alloy at high temperatures

✍ Scribed by Dr. E. Roszczynialska; Dr. J. Jedlinski; Dr. A. Gil; Prof. M. Danielewski

Publisher
John Wiley and Sons
Year
1992
Tongue
German
Weight
876 KB
Volume
43
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

The effect of 0.6 wt.% yttrium addition on the oxidation behaviour of the coating material Ni‐23Co‐19Cr‐12Al was studied under isothermal and thermal cycling conditions in air at 1373 and 1473 K. The reaction was followed thermogravimetrically while the SEM, EDX, EPMA and X‐ray diffraction techniques were used to characterise the starting materials and the oxidized samples. Intensive spalling and the formation of a deep internal oxidation zone were observed in the case of the yttrium‐free alloy. Yttrium strongly improved the oxidation resistance by substantial suppression of scale spalling and considerable reduction of internal oxidation.

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