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The high temperature creep properties of a thermally sprayed CoNiCrAlY coating via small punch creep testing

Jackson, G.A.; Chen, H.; Sun, Wei; McCartney, D.G.


G.A. Jackson

H. Chen

Wei Sun

D.G. McCartney


Thermal barrier coatings (TBC’s) protect superalloy components from excessively high temperatures in gas turbines. TBC’s comprise of a ceramic top coat, a metallic bond coat and a thermally grown oxide (TGO). The creep behaviour of the MCrAlY bond coat, which is sensitive to the composition and the method of deposition, has a significant effect on the life of the TBC. High velocity oxy-fuel (HVOF) thermal spraying is a popular deposition method for MCrAlY bond coats however the creep properties of HVOF MCrAlY coatings are not well documented. The creep behaviour of a HVOF thermally sprayed CoNiCrAlY coating has been determined by small punch creep (SPC) testing. Tests were conducted between an equivalent uniaxial stress range of 37-80 MPa at 750 °C on two different SPC rigs and between 30-49 MPa at 850 °C on a single SPC rig. The measured steady-state creep deformation rates at 750 °C were consistent across the two rigs. A comparison with previous work demonstrated that the creep behaviour of HVOF CoNiCrAlY coatings is not sensitive to the manufacturing variability associated with HVOF thermal spraying. The CoNiCrAlY coating exhibited typical SPC deformation at 750 °C. At 850 °C the CoNiCrAlY coating showed significantly different creep behaviour which could be attributed to the onset of superplasticity.


Jackson, G., Chen, H., Sun, W., & McCartney, D. (2017). The high temperature creep properties of a thermally sprayed CoNiCrAlY coating via small punch creep testing. Key Engineering Materials, 734,

Journal Article Type Article
Acceptance Date Jan 17, 2017
Publication Date Apr 20, 2017
Deposit Date Apr 6, 2017
Journal Key Engineering Materials
Print ISSN 1013-9826
Electronic ISSN 1662-9795
Publisher Trans Tech Publications
Peer Reviewed Peer Reviewed
Volume 734
Keywords Small Punch Creep Testing, CoNiCrAlY, MCrAlY, HVOF, Creep, Mechanical properties
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