Fracture properties of SiC ceramics with oxynitride additives |
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| Affiliation: | 1. Max-Planck-Institut für Metallforschung and Institut für Nichtmetallische Anorganische Materialien der Universität Stuttgart,Pulvermetallurgisches Laboratorium, Heisenbergstraße 5, D-70569 Stuttgart, Germany;2. Indian Institute of Technology, Kanpur 208016, India;1. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, LuoYu Road 1037, Wuhan, China;2. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, China;3. Northwest Institute for Non-ferrous Metal Research, Xi’an 710016, Shaanxi, China;1. Department of Chemistry, DePaul University, 1110 W Belden Ave, Chicago, IL 60614, United States;2. Department of Medicinal Chemistry and Pharmacognosy, University of Illinois at Chicago, 833 S Wood St, Chicago, IL 60612, United States;3. Department of Pharmaceutical Sciences, College of Pharmacy, Rosalind Franklin University of Medicine and Science, 3333 Green Bay Rd, North Chicago, IL 60064, United States;1. Technical University of Denmark, Department of Energy Conversion and Storage, Risø Campus, Frederiksborgvej 399, P.O. Box 49, Building 779, 4000 Roskilde, Denmark;2. San Diego State University, Mechanical Engineering Department, 5500 Campanile Dr., San Diego, CA 92182-1323, USA;1. DICATAM, Università di Brescia, via Branze 43, 25123 Brescia, Italy;2. Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, United States;3. Center for Shock Wave-processing of Advanced Reactive Materials, University of Notre Dame, Notre Dame, IN, United States |
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| Abstract: | Silicon carbide ceramics incorporating sintering additives from the system AlN–Y2O3 can be gas-pressure sintered to theoretical density. While commonly a combination of sesquioxides is used such as Al2O3–Y2O3, oxynitride additives offer the advantage that only a moderate nitrogen overpressure is required instead of a powder bed for thermochemical stabilization at the sintering temperature. In the present study aspects of the fracture behavior of these materials are addressed, namely the influence of anisotropic grain growth and processing flaws, additional toughening at high temperatures and thermal shock characteristics. They are correlated with microstructural data obtained by scanning electron microscopy. |
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