Continuous alumina fiber-reinforced yttria-stabilized zirconia composites with high density and toughness |
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| Affiliation: | 1. Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;2. Key Lab of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;3. Gas Turbine Research Institute, Shanghai Jiao Tong University, Shanghai, 200240, China;4. Institute of Materials Modification and Modeling, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;5. School of Materials, University of Manchester, MSS Tower, Manchester, M13 9PL, UK;1. The Fifth Research Institute, Equipment Academy of the Rocket Force, Beijing 100094, China;2. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, Hunan Province, China;3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 10083, China;1. Institute of Structures and Design, German Aerospace Center Stuttgart, 70569 Stuttgart, Germany;2. Fraunhofer Institute for Silicate Research ISC / Center for High Temperature Materials and Design HTL, Germany;3. Walter E. C. Pritzkow Spezialkeramik, Germany;1. Department of Applied Science and Technology, Politecnico di Torino, Italy;2. Department of Ceramic Materials Engineering, University of Bayreuth, Bayreuth, Germany |
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| Abstract: | Continuous alumina fiber-reinforced yttria-stabilized zirconia (YSZ) composites with a LaPO4 fiber coating were fabricated by slurry infiltration and spark plasma sintering (SPS). The LaPO4 coating was deposited on the reinforcement alumina fabrics by a modified sol-gel method. The YSZ slurry with good dispersion and stability was prepared by optimizing the pH value, dispersant addition and ball milling time. The fabricated composite with a high density of ∼ 92 % has a good flexural strength of 277 ± 43 MPa, and a superior fracture toughness of 15.93 ± 0.75 MPa·m1/2 exhibiting a non-brittle failure behavior. It was found that the LaPO4 coating reduced the residual stress near the fiber/matrix interface to 131 ± 41 MPa, which was 369 ± 63 MPa in the composite without the fiber coating. The LaPO4 coating renders a weak interphase to improve the composite toughness by activating several toughening mechanisms including crack deflection, fiber debonding and pullout, and delamination behavior. |
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| Keywords: | Fiber-reinforced composites Alumina fibers Yttria-stabilized zirconia Mechanical properties Residual stress |
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