Tape Cast Multilayer Composite of Nano Zirconia with High Toughness |
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Authors: | S. Ghosh A. Guha K. M. Krishna A. K. Mukhopadhyay H. S. Maiti |
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Affiliation: | a Composite Laboratory, Non-Oxide Ceramic and Composite Division, Central Glass and Ceramic Research Institute, Kolkata, Indiab Department of Applied Mechanics, Motilal Nehru National Institute of Technology, Allahabad, India |
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Abstract: | During the last decade, worldwide attention of researchers has focused on nano-ceramic composites with superior mechanical behavior and improved reliability for structural applications. Here we report the development of a multi-layer composite (MLC) of tape cast nano zirconia with high failure energy. The MLC samples were fabricated by thermocompression of green tapes prepared from 3 mole % yttria stabilized zirconia (3-YSZ) powder with a primary crystallite size of 27 nm. Depending on the number of layers, the MLC samples exhibited failure energy (238.97 KJm-3) more than two times higher than that of the single tape (≈107 KJm-3) with a reasonably high bi-axial flexural strength (≈630 MPa), high hardness (≈ 13 GPa at 49 N), and indentation fracture toughness nearly four times as high as that of the single tape. In addition, these MLC materials showed the presence of a R-curve behavior. |
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Keywords: | Composite Crack deflection Failure energy Fracture Hardness Indentation Microstructure Multilayer Nano zirconia Strength Tape-casting Toughness Transformation-toughening |
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