High temperature fracture toughness of ceramic coatings evaluated using micro-pillar splitting

被引：27
作者：
Best, James P. [1 ,2 ]
Wehrs, Juri [2 ,3 ]
Polyakov, Mikhail [2 ]
Morstein, Marcus [3 ,4 ]
Michier, Johann [2 ]
机构：
[1] UNSW Sydney, Sch Mech & Mfg Engn, Sydney, NSW 2052, Australia
[2] Empa, Swiss Fed Labs Mat Sci & Technol, Lab Mech Mat & Nanostruct, Feuerwerkerstr 39, CH-3602 Thun, Switzerland
[3] PIATIT AG Adv Coating Syst, Eichholzstr 9, CH-2545 Selzach, Switzerland
[4] Hightech Zentrum Aargau AG, Badenerstr 13, CH-5200 Brugg, Switzerland
来源：
SCRIPTA MATERIALIA | 2019年 / 162卷
关键词：
Thin films - coatings; Ceramics; High-temperature deformation; Toughness; MECHANICAL-PROPERTIES; CRACK; DEFORMATION; BEHAVIOR;
D O I：
10.1016/j.scriptamat.2018.11.013
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Micro-pillar splitting at temperatures up to 500 degrees 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. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：190 / 194
页数：5
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