ALKALI-FREE GLASS

The present invention relates to an alkali-free glass having a strain point of 700° C. or higher and 740° C. or lower, a density of 2.6 g/cm3 or lower, a Young's modulus of 90 GPa or higher and 100 GPa or lower, an average coefficient of thermal expansion at 50° C. to 350° C. of 30×10−7/K or hi...

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Bibliographische Detailangaben
Hauptverfasser:	TOKUNAGA, Hirofumi, HAMADA, Yuya
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES METALLURGY MINERAL OR SLAG WOOL SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS
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Beschreibung
Zusammenfassung:	The present invention relates to an alkali-free glass having a strain point of 700° C. or higher and 740° C. or lower, a density of 2.6 g/cm3 or lower, a Young's modulus of 90 GPa or higher and 100 GPa or lower, an average coefficient of thermal expansion at 50° C. to 350° C. of 30×10−7/K or higher and 39×10−7/K or lower, a temperature T2 at which a glass viscosity reaches 102 dPa·s of 1590° C. or higher and 1690° C. or lower, a temperature T4 at which the glass viscosity reaches 104 dPa·s of 1350° C. or lower, a glass surface devitrification temperature (Tc) of lower than (T4+80)° C., and a specific elastic modulus of 36 MN·m/kg or higher, and including a prescribed glass composition.