ZrO2-Transformation-Toughened Glass-Ceramics Prepared by the Sol-Gel Process from Metal Alkoxides |
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| Authors: | M. NOGAMI&# ,M. TOMOZAWA&# |
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| Affiliation: | Government Industrial Research Institute, Osaka, Ikeda, Osaka 563, Japan;Materials Engineering Department and Center for Glass Science and Technology, Rensselaer Polytechnic Institute, Troy, New York 12181 |
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| Abstract: | Glasses of composition 3ZrO2O · 2SiO2 were prepared by the sol-gel process from metal alkoxides. Tetragonal ZrO2 was precipitated by appropriate heat treatment at 1000° to 1200°C. The fracture toughness of these glass-ceramics increased with increasing crystallite size of the tetragonal ZrO2, reaching ∼5.0 MN/m3/2 at a size of ∼40 nm. The higher fracture toughness was attributed to tetragonal → monoclinic ZrO2 transformation toughening. |
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