Mechanical properties of zirconia-based ceramics asfunctions of temperature |
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| Affiliation: | 1. Advanced Materials Technology, Caterpillar Inc., Peoria, IL 61656-1875, USA;2. Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge TN 37830-6069, USA;1. Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Polizu, 011061, Bucharest, Romania;2. Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 SplaiulIndependentei, 050095, Bucharest, Romania;3. Academy of Romanian Scientist, SplaiulIndependentei 54, 050094, Bucharest, Romania;1. Missouri Bone & Joint Research Foundation, St. Louis, Missouri;2. Signal Medical Corporation, Marysville, Michigan;3. Brainlab, Inc, Westchester, Illinois;1. Assistant Professor, Department of Operative Dentistry, School of Dentistry, University of North Carolina, Chapel Hill, NC;2. Assistant Professor, Department of General Practice, School of Dentistry, Virginia Commonwealth University, Richmond, Va;3. Doctoral student, Department of Prosthetic Dentistry and Turku Clinical Biomaterials Centre, Institute of Dentistry, University of Turku, Turku, Finland;4. Associate Professor and Laboratory Manager, Department of Prosthetic Dentistry and Turku Clinical Biomaterials Centre, Institute of Dentistry, University of Turku, Turku, Finland;1. Graduate student, College of Dentistry, Yonsei University, Seoul, Republic of Korea;2. Private practice, Seoul, Republic of Korea;3. Professor and Chairman, Department of Prosthodontics, College of Dentistry, Yonsei University, Seoul, Republic of Korea;4. Professor and Chairman, Department of Prosthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Republic of Korea;1. Department of Materials Engineering, Bu-Ali Sina University, Hamedan, 65178-38695, Iran;2. Environmental Science and Engineering Program, University of Texas at El Paso, El Paso, TX, 79968, USA |
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| Abstract: | Commercially available ceramics, MgO–ZrO2, CeO2–ZrO2, and an in-house fabricated zirconia-toughened mullite were examined in this study for use as a structural component in diesel engines. The fast fracture strengths of these materials were measured by loading ASTM C-1161-B specimens in four-point flexure at 30 MPa/s and at 20, 200, 400, 600, and 850 °C. The dynamic fatigue or slow crack growth susceptibility was assessed at 20 and 850 °C by combining the fast fracture strengths with strength data obtained by testing the same specimens in four-point flexure at 0.30 and 0.003 MPa/s stressing rates, as specified in the ASTM C 1368 standard. Fracture toughness was measured following the ASTM C-1421 standard and using chevron notch specimens in three-point flexure at room and elevated temperatures. The strength of the zirconia-toughened mullite was invariant to increases in the temperature and decreases in the loading rate, while the MgO–ZrO2 and CeO2–ZrO2 materials exhibited strength degradation as temperatures increased and the loading rates decreased. Temperature was observed to have the greatest influence on facture toughness. As temperatures increased, the fracture toughness values dramatically decreased for all the materials examined in this study. Improvements in the fracture toughness are needed most for these ceramic materials in order to meet the structural requirements and to develop a more durable and reliable diesel engine component. |
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