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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.
ACKNOWLEDGMENTS
The authors appreciate the financial support from Project No. CMM 0022, CSIR, award of a CSIR Diamond Jubilee Research Internship to S. Ghosh; and experimental help received from Mr. S. K. Dalui, Mr. A. K. De, Mr. A. Mandal, Mr. R. Singha Roy, Dr. Mrs. S. Sen, Dr. A. Chakraborty, and Dr. D. Basu of Central Glass and Ceramic Research Institute (CGCRI), Kolkata, India. Encouragements received from Dr. D. K. Bhattacharyay and Dr. K. K. Phani of CGCRI are also deeply appreciated.