High temperature fracture toughness of ceramic coatings evaluated using micro-pillar splitting. (15th March 2019)

• Record Type: Journal Article
• Authors: Best, James P.; Wehrs, Juri; Polyakov, Mikhail; Morstein, Marcus; Michler, Johann
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 190
• Page End: 194
• Publication Date: 2019-03-15
• Subjects: Thin films - coatings -- Ceramics -- High-temperature deformation -- Toughness; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.11.013
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Micro-pillar splitting at temperatures up to 500 °C was used to evaluate the toughness for a series of thin physical vapour deposited ceramic-nitride coatings. When compared to ion beam notched geometries, this testing approach reduces the likelihood of ion impregnation within a material volume where fracture may initiate. A toughness increase with elevated temperature was observed for the nanostructured ceramic coatings; the magnitude of which varied between the coatings. A transmission electron microscopy investigation showed deposition-specific periodic nano-layering within the films as a result of the deposition process, which may explain the observed differences in the toughness trends. Graphical abstract: Unlabelled Image