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Corrugated glass-ceramics from LZSA cast tapes
The aim of this work was to fabricate corrugated lightweight structures from green tapes of lithium oxide-zirconium dioxide-silicon dioxide-aluminum oxide (LZSA: Li2O-ZrO2-SiO2-Al2O3) glass-ceramics. The green tapes were cast, thermopressed, corrugated and sintered at 800 degrees C for 1 hour, yielding low porous and homogeneous microstructures confirmed by electron microscopy analysis. During thermal treatment, micrometer size crystals from main phases of beta-spodumene, lithium metasilicate and zirconium silicate were formed. The monociclic zirconium oxide did not transform to the zirconium silicate completely and remained in oxide form, even after a 10 h treatment at 850 degrees C. Dilatometric analysis demonstrated three linear regions, each one exhibiting a specific thermal expansion coefficient (TEC) in the 25 to 800 degrees C temperature range. The thermal expansion behavior was found to be structure-independent only up to the critical temperature of 600 degrees C, as a result of which the LZSA glass-ceramics should be utilized above this temperature. The deviations in thermal expansion behavior above 600 degrees C are ascribed to the changes caused by the rest glass phase. It was also concluded that 600 degrees C was the critical temperature above which the LZSA glass-ceramic structure could not be assembled. The fabricated bodies were also characterized macroscopically and geometrically to verify the integrity and the morphology of the structures.
Corrugated glass-ceramics from LZSA cast tapes
The aim of this work was to fabricate corrugated lightweight structures from green tapes of lithium oxide-zirconium dioxide-silicon dioxide-aluminum oxide (LZSA: Li2O-ZrO2-SiO2-Al2O3) glass-ceramics. The green tapes were cast, thermopressed, corrugated and sintered at 800 degrees C for 1 hour, yielding low porous and homogeneous microstructures confirmed by electron microscopy analysis. During thermal treatment, micrometer size crystals from main phases of beta-spodumene, lithium metasilicate and zirconium silicate were formed. The monociclic zirconium oxide did not transform to the zirconium silicate completely and remained in oxide form, even after a 10 h treatment at 850 degrees C. Dilatometric analysis demonstrated three linear regions, each one exhibiting a specific thermal expansion coefficient (TEC) in the 25 to 800 degrees C temperature range. The thermal expansion behavior was found to be structure-independent only up to the critical temperature of 600 degrees C, as a result of which the LZSA glass-ceramics should be utilized above this temperature. The deviations in thermal expansion behavior above 600 degrees C are ascribed to the changes caused by the rest glass phase. It was also concluded that 600 degrees C was the critical temperature above which the LZSA glass-ceramic structure could not be assembled. The fabricated bodies were also characterized macroscopically and geometrically to verify the integrity and the morphology of the structures.
Corrugated glass-ceramics from LZSA cast tapes
Wellglaskeramik aus gegossenem LZSA-Band
Hausöl, Tina (author) / Gomes, Cynthia M. (author) / Birol, Hansu (author) / Oliveira, Antonio P.N. (author) / Hotza, Dachamir (author) / Travitzky, Nahum (author) / Greil, Peter (author)
Journal of Materials Processing Technology ; 210 ; 1556-1561
2010
6 Seiten, 8 Bilder, 3 Tabellen, 17 Quellen
Article (Journal)
English
Wellwerkstoff , Glaskeramik , Leichtbauweise , Leichtbauprofil , Wabenstruktur , Bandgießen , Oxidkeramik , Lithiumoxid , Zirkoniumoxid , Siliciumdioxid , Aluminiumoxid , Mischoxid , Sinterkeramik , Mikrostruktur , Temperatureinfluss , Spodumen , Zirkoniumsilicat , monokline Kristallstruktur , Umwandlungsverhalten , Dehnungsprüfung , thermischer Ausdehnungskoeffizient , kritische Temperatur , amorpher Zustand , Maßbeständigkeit , Baustoff , Kristallisation , Werkstoffeignung
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