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The influence of yttrium on the Oxidation behaviour of Ni‐23Co‐19Cr‐12Al alloy at high temperatures
Author(s) -
Roszczynialska E.,
Jedlinski J.,
Gil A.,
Danielewski M.
Publication year - 1992
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19920430306
Subject(s) - yttrium , alloy , isothermal process , materials science , metallurgy , electron microprobe , spall , temperature cycling , coating , internal oxidation , composite material , thermal , thermodynamics , oxide , physics
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.