Please use this identifier to cite or link to this item: http://hdl.handle.net/2080/2852
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dc.contributor.authorAnand, Rahul-
dc.contributor.authorNayak, Bibhuti B-
dc.contributor.authorBehera, Shantanu K-
dc.date.accessioned2018-01-04T10:45:25Z-
dc.date.available2018-01-04T10:45:25Z-
dc.date.issued2017-12-
dc.identifier.citation81st Annual session of Indian Ceramic Society and International conference on “Expanding Horizons of Technological Applications of Ceramics and Glasses", Pune, India, 14 - 16 December, 2017.en_US
dc.identifier.urihttp://hdl.handle.net/2080/2852-
dc.descriptionCopyright of this document belongs to proceedings publisher.en_US
dc.description.abstractPolymer-derived ceramics (PDCs) like SiCN, SiBCN poses excellent creep and oxidation resistance. Their unique shaping advantage (due to liquid precursors) and nanostructure make them suitable for coating for coating application, including TBCs and EBCs. SiC based coatings and composites, though perform well at high temperatures, usually disintegrate in atmosphere containing moisture. Polymer derived Si-ceramics are probable materials for applications as bond coats in such high temperature resistant coatings. The purpose of the present work is to explore the evolution of nanostructure in PDC materials with the introduction of transition metal ions. Molecular sources of Zr and/or Hf can affect the nanostructure during the pyrolysis induced conversion of the polymeric phase to ceramic. In the current work, Zr was incorporated into a commercially available polyvinylsilazane and pyrolyzed in an inert atmosphere at different temperatures, ranging from 1000-1400 oC. The pyrolyzed SiZrCN ceramic hybrid appeared as a single phase amorphous ceramic at 1000 oC, and exhibited phase separation of Zr into nanocrystals of t-ZrO2 with higher pyrolysis temperature. Interestingly the nanocrystals exhibited exceptional homogeneity in size (2-6 nm) and distribution in the amorphous SiCN matrix, as confirmed by HRTEM and XRD. The retention of tetragonal phase of ZrO2 in the ceramic matrix, even after pyrolysis at 1400 °C, provides a significant advantage for achieving enhanced toughness of the bond coat. These findings will allow the fabrication of a bond coat material with better toughness, oxidation resistant, hot strength, and tailorable thermal expansion coefficient to match between SiC and other top-coat oxides.en_US
dc.subjectPDCen_US
dc.subjectSilicon Carbonitrideen_US
dc.subjectZrO2en_US
dc.subjectEBCen_US
dc.subjectHRTEMen_US
dc.titlePhase evolution in polymer derived silicon carbonitride ceramic hybridsen_US
dc.typePresentationen_US
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