Microstructures and Properties of Al2O3/ZrO2 Composite Ceramics from In Situ Growth in the Melts Produced by Combustion Synthesis

Zhong Min Zhao; Long Zhang; Hong Bai Bai; Jian Zheng; Jiang Wu

doi:10.4028/www.scientific.net/KEM.336-338.2260

Paper Titles

Multifunctional BN/Si₃N₄ and TiN/Si₃N₄ Nanocomposites Prepared by In Situ Nitridation Method
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Microstructure and Mechanical Properties of SiC-Al₂O₃ Nanocomposite Prepared by Surface Modified SiC Nanopowders
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Preparation and Properties of Al₂O₃ Particle Dispersed 3Y-TZP Nanoceramics Doped with TiO₂
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Microstructures and Multi-Toughening of ZrO₂ Nano-Micron Fibers Self-Toughening Al₂O₃ Ceramics from In Situ Growth in the Melts Produced by Combustion Synthesis
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Microstructures and Properties of Al₂O₃/ZrO₂ Composite Ceramics from In Situ Growth in the Melts Produced by Combustion Synthesis
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From Kaolins (with Addition of Al₂O₃) to Mullite Composite Nanocrystals: Experiments and Analysis
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Spectroscopic Study of Rod-Like Mesoporous ZnO-SiO₂ Composites
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Role of Amorphous Silicon Carbide in Microstructure and Mechanical Properties of nc-TiC/a-SiC Nanocomposite Coatings Prepared by PECVD
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Preparation and Characterization of CdSe/SiO₂ Nanocomposites by Sol Gel Method and In Situ Growth
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Microstructures and Properties of Al₂O₃/ZrO₂ Composite Ceramics from In Situ Growth in the Melts Produced by Combustion Synthesis

Abstract:

By introducing ZrO2 (3Y) micron powder into the thermit, Al2O3/18%, 21%, 24%, 27% and 30%ZrO2 composite ceramics were obtained from in-situ growth in the melts produced by combustion synthesis. As the volume fraction of ZrO2 is below 27%, the ceramics is comprised of lath-shaped and rod-shaped α-Al2O3 matrix, within the rod-shaped grain the nano-micron fibers are oriented in essentially the same direction. As volume fraction of ZrO2 is over 27%, the ceramics is mainly composed of lamina-shaped grains with alternating α-Al2O3 and t-ZrO2 layers. The flexural strength and the fracture toughness measured simultaneously the maximum values with increasing volume fraction of ZrO2 to 24%, indicating that flexural strength and fracture toughness are simultaneously under the control of rod-shaped grains in which ZrO2 nano-micron monocrystal fibers are embedded.