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Reinforcement Mechanisms in Yttria-Ceria-Co-Stabilized Zirconia-Alumina-Strontium Hexaaluminate Composite Ceramics
F. Kern, A. Gommeringer
University of Stuttgart, Institute for Manufacturing Technologies of Ceramic Components and Composites, Allmandring 7B, D-70569 Stuttgart, Germany
received June 30, 2017, , accepted September 12, 2017
Vol. 9, No. 1, Pages 93-98 DOI: 10.4416/JCST2017-00046
Abstract
Composite ceramics with 1 mol% yttria and 6 mol% ceria co-stabilized zirconia matrix were reinforced with 10 vol% alumina and 10 vol% in situ-formed strontium hexaaluminate. Samples were shaped by means of slip casting in plaster molds and sintered in air for 3 – 72 h at 1500 °C. Full density and highest fracture resistance were achieved in overfired material while the maximum strength of 900 MPa was obtained at a dwell of 12 h. The high fracture resistance up to 10.4 MPa√m results from contributions of different reinforcement mechanisms: microcracking, crack bridging, crack deflection and – predominantly – transformation toughening.
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Keywords
Zirconia, platelets, microstructure, mechanical properties
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