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Bridging stresses in sintered reaction-bonded Si3N4 from COD measurements
Affiliation:1. Forschungszentrum Karlsruhe, Institut für Materialforschung II, Postfach 3640, D-76021 Karlsruhe, Germany;2. Darmstadt University of Technology, Institute of Materials Science, Petersenstr. 23, 64287 Darmstadt, Germany;3. Ceramics Division, National Institute for Standards and Technology, Gaithersburg, MD 20899, USA;1. School of Materials Science and Technology, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences, Beijing 100083, China;2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;3. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK;1. Department of Ceramic Engineering, National Institute of Technology, Rourkela 769008, Odisha, India;2. TBM Division, Institute of Plasma Research, Bhat, Gandhinagar 382428, Gujarat, India;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;2. College of Materials Science and Engineering, Hunan University, Changsha 410082, PR China;1. Department of Electronics and Communications Engineering, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland;2. Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland;3. Department of Mathematics, Tampere University of Technology, P.O. Box 553, FI-33101 Tampere, Finland;1. National Scientific and Technical Research Council (CONICET), Av. Rivadavia 1917, (C1033AAJ), Buenos Aires, Argentina;2. Plastics Research and Development Center, National Institute of Industrial Technology (INTI-Plásticos), Av. Gral. Paz 5445, (B1650KNA), San Martín, Buenos Aires, Argentina;3. Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Strasse 6, D-01069 Dresden, Germany
Abstract:Crack opening displacement measurements on a sintered reaction-bonded Si3N4 ceramic obtained in bending tests with edge-V-notched specimens were evaluated. A procedure is proposed which allows a straight-forward evaluation of the experimental results in order to obtain the bridging stresses as a function of crack opening displacements. Bridging stresses up to 160 MPa were found acting over a distance of about 0.4 μm. In addition crack profile measurements were performed for Vickers indentation cracks which could approximately be described by use of the bridging relation obtained.
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