Slow crack growth resistance of electrically conductive zirconia-based composites with non-oxide reinforcements |
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| Affiliation: | 1. KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, B-3001 Heverlee, Belgium;2. Univ. Lyon, UMR CNRS 5510 (MATEIS), INSA de Lyon, France;1. LSFC Laboratoire de Synthèse et Fonctionnalisation des Céramiques, UMR 3080, CNRS/Saint-Gobain CREE, 550 Av. Alphonse Jauffret, 84306 Cavaillon Cedex, France;2. Institute of Ceramics and Glass (ICV-CSIC), Kelsen 5, 28049 Madrid, Spain;1. School of Physics and Information Technology, Shaanxi Normal University, Xi’an, 710119, PR China;2. School of Science, Xi’an University of Posts and Telecommunications, Xi’an, 710121, PR China;1. School of Physics and Electronic Information, Henan Polytechnic University, Jiaozuo 454000, China;2. Xiamen Talentmats New Materials Science & Technology LLC, Xiamen 361015, China;3. Glass Coatings and Concepts LLC, A Subsidiary of Shepherd Materials Science Companies, Monroe 45069, United States;1. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, 221116, China;2. School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore;3. School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore |
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| Abstract: | Slow crack growth (SCG) behavior of four zirconia-based composites reinforced with 40 vol% WC, TiC, NbC or TiCN were studied by means of double-torsion testing. Compared to monolithic zirconia, the composites had a higher resistance to fast fracture, i.e., higher fracture toughness. The extent of toughening depended on the reinforcement type, shifting the V-KI (crack velocity versus stress intensity factor) curve parallel to higher KI values. More importantly, these composites were less sensitive to SCG. Identical V-KI/KIC curves with steeper slopes compared to monolithic zirconia were observed for the investigated composites, independent on the reinforcement type. No rising R-curve was measured, at least in the crack-size domain investigated by SCG. Therefore, the higher SCG resistance of the composites was due to the intrinsic stress-assisted corrosion resistance of the covalent non-oxide secondary phase. |
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| Keywords: | Fracture resistance Slow crack growth Zirconia Non-oxide reinforcements |
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