New Sintered Li2O–Al2O3–SiO2 Ultra‐Low Expansion Glass‐Ceramic |
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| Authors: | Viviane O. Soares Oscar Peitl Edgar D. Zanotto |
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| Affiliation: | 1. Department of Science, State University of Maringá, , Goioerê, 87360‐000 Paraná, Brazil;2. Vitreous Materials Laboratory, Department of Materials Engineering, Federal University of S?o Carlos, , S?o Carlos, 13565‐905 S?o Paulo, Brazil |
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| Abstract: | We developed a new Li2O–Al2O3–SiO2 (LAS) ultra‐low expansion glass‐ceramic by nonisothermal sintering with concurrent crystallization. The optimum sintering conditions were 30°C/min with a maximum temperature of 1000°C. The best sintered material reached 98% of the theoretical density of the parent glass and has an extremely low linear thermal expansion coefficient (0.02 × 10?6/°C) in the temperature range of 40°C–500°C, which is even lower than that of the commercial glass‐ceramic Ceran® that is produced by the traditional ceramization method. The sintered glass‐ceramic presents a four‐point bending strength of 92 ± 15 MPa, which is similar to that of Ceran® (98 ± 6 MPa), in spite of the 2% porosity. It is white opaque and does not have significant infrared transmission. The maximum use temperature is 600°C. It could thus be used on modern inductively heated cooktops. |
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