Fabrication and characterization of polymer-derived Si2N2O-ZrO2 nanocomposite ceramics |
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| Authors: | V M Sglavo R Dal Maschio G D Sorarù A Bellosi |
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| Affiliation: | (1) Dipartimento di Ingegneria dei Materiali, Università del Trento, via Mesiano 77, I-38050 Trento, Italy;(2) CNR Istituto di Ricerche Tecnologiche per la Ceramica, via Granarolo 64, I-48018 Faenza, Italy |
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| Abstract: | Amorphous Si-Zr-N-O powders, obtained by nitridation in an NH3 flow of zirconium modified polycarbosilane, have been sintered to full density by hot pressing at 1500 C. The resulting ceramic shows an extremely fine-grained microstructure composed of Si2N2O and ZrO2 crystallites 20–30 nm in diameter. Thermal stability measured in air appears excellent up to 1300C for 48 h. Mechanical characterization pointed out good values of flexural strength (330 MPa), fracture toughness (4.1 MPam0.5) and Weibull modulus. |
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