Thermal cycling life and failure analysis of rare earth magnesium hexaaluminate based advanced thermal barrier coatings at 1400°C

Thermal cycling lifespan of novel rare earth magnesium hexaaluminate (REMHA) based thermal barrier coatings (TBCs) such as lanthanum magnesium hexaaluminate (LMHA), neodymium doped LMHA (LNMHA) and LNMHA-yttrium aluminium garnet (YAG) composite was tested using gas burner rig operating at 1400°C. A...

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Bibliographic Details
Published in:Surface & coatings technology 2017-11, Vol.328, p.398-409
Main Authors: Jana, P., Jayan, P.S., Mandal, S., Biswas, K.
Format: Article
Language:English
Subjects:
Aluminum
Burner rig test
Ceramic coatings
Failure analysis
Failure mechanisms
Fracture toughness
Hexaaluminate
Lanthanum
Magnesium
Neodymium
Plasma spraying
Rare earth elements
Temperature
Thermal barrier coating
Thermal barrier coatings
Thermal cycling
Thermal cycling life
Thermal expansion
Thermal properties
Yttria-stabilized zirconia
Yttrium oxide
Yttrium-aluminum garnet
Zirconium dioxide
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Summary:Thermal cycling lifespan of novel rare earth magnesium hexaaluminate (REMHA) based thermal barrier coatings (TBCs) such as lanthanum magnesium hexaaluminate (LMHA), neodymium doped LMHA (LNMHA) and LNMHA-yttrium aluminium garnet (YAG) composite was tested using gas burner rig operating at 1400°C. A standard TBC of yttria stabilized zirconia used as a reference was also tested under similar conditions. The failure mechanism of these coatings was also investigated. The REMHA based coatings have shown much higher life as compared to YSZ coating. LNMHA coating was found to last longer i.e., completed 7851cycles (almost 916h) which is 2.7 and 4.2 times higher than the parent LMHA and YSZ coatings, respectively. Thermal expansion coefficient and fracture toughness of the ceramic top coat play a vital role and determine the type of failure. LNMHA coating seems to be a promising candidate for advanced TBCs operating at temperature as high as 1400°C. [Display omitted] •Thermal cycling life of rare earth magnesium hexaaluminate (REMHA) based TBCs•Thermo-physical properties of LMHA (L=La) were enhanced by suitable tailoring.•Neodymium doped LMHA completed 8751cycles i.e., 4.2 times higher than YSZ coating.•Complete degradation of ceramic topcoat caused the failure REMHA based TBCs.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2017.09.019