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Measurements of elastic modulus and fracture toughness of an air plasma sprayed thermal barrier coating using micro-cantilever bending
University of Manchester,School of Materials, M13 9PL, Manchester, United Kingdom.
University of Manchester,School of Materials, M13 9PL, Manchester, United Kingdom.
Shanghai Jiao Tong University, Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, Shanghai, 200240, China.
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT). (PTW)ORCID-id: 0000-0002-9578-4076
Vise andre og tillknytning
2019 (engelsk)Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 374, s. 12-20Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The elastic modulus and fracture toughness of an air plasma sprayed thermal barrier coating (APS TBC) were measured using the micro-cantilever bending technique. The micro-cantilevers were machined by a focused ion beam with their central arms either parallel or normal to the bond coat/topcoat interface. Such orientations allowed direct measurements of both the in-plane and out-of-plane elastic moduli as well as mode I fracture toughness by bending. The calculated elastic modulus along the in-plane and out-of-plane direction is 144 GPa and 110 GPa, respectively, suggesting that the APS TBC is elastically anisotropic at microscale. The derived mode I fracture toughness along the plane parallel to the interface is 0.40 MPam. This relatively low toughness reflects the weak fracture resistance of the highly-flawed APS for short cracks at microscale. The measurements in this study can be incorporated into micromechanical life time prediction models of the APS TBCs. © 2019 Elsevier B.V.

sted, utgiver, år, opplag, sider
2019. Vol. 374, s. 12-20
Emneord [en]
Elastic moduli; Ion beams; Microstructure; Nanocantilevers; Plasma jets; Plasma spraying; Thermal barrier coatings, Air plasma sprayed thermal barrier coatings; Direct measurement; Lifetime prediction; Measurements of; Micro-cantilevers; Micro-mechanical; Mode-i fracture toughness; Out-of-plane direction, Fracture toughness
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Forskningsprogram
TEKNIK, Produktions- och materialteknik; Produktionsteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-14455DOI: 10.1016/j.surfcoat.2019.05.031ISI: 000486360000002Scopus ID: 2-s2.0-85066829982OAI: oai:DiVA.org:hv-14455DiVA, id: diva2:1356397
Tilgjengelig fra: 2019-10-01 Laget: 2019-10-01 Sist oppdatert: 2020-01-10bibliografisk kontrollert

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Markocsan, NicolaieNylén, Per

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