Thermal expansion of MCrAlY alloys

The thermal expansion behaviors of thirteen plasma-sprayed MCrAlY and related coatings, plus Tribomet TM-309 and its NiCo matrix were determined. Replicate runs to 1100 °C in argon for all coatings allowed the experimental variability and reliability of differences between coatings to be described....

Full description

Saved in:
Bibliographic Details
Published in:Surface & coatings technology 2004-01, Vol.177, p.24-31
Main Authors: Taylor, T.A., Walsh, P.N.
Format: Article
Language:English
Subjects:
Coatings
McrAlY
NiCrAlY
Thermal expansion
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The thermal expansion behaviors of thirteen plasma-sprayed MCrAlY and related coatings, plus Tribomet TM-309 and its NiCo matrix were determined. Replicate runs to 1100 °C in argon for all coatings allowed the experimental variability and reliability of differences between coatings to be described. Wet chemical analysis of eight samples allowed multiple correlations between coating expansion and composition to be found. The model equations give calculated expansions at 525 and 825 °C within a few 0.1 mm/m of the original measurement for most coatings. The model and the original expansion data both show a NiCrAlY alloy, such as LN-33 has significantly lower expansion than current CoNiCrAlY coatings. Using low expansion NiCrAlY as a bondcoat is predicted to generate longer thermal cycle life of TBC coatings due to reduced expansion-induced interface stress with the YSZ ceramic.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2003.05.001