Lithium containing aluminosilicate glass with low expansion after chemical toughening

A chemically toughenable or toughened glass has, before chemical toughening, a thickness t of at most 1100 μm. The glass comprises the following components: 45-75 mol-% SiO2; 10-25 mol-% Al2O3; >1-11 mol-% Li2O; 0-15 mol-% P2O5; 0-8 mol-% B2O3; and 0-5 mol-% TiO2. The average number of bridging o...

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Bibliographische Detailangaben
Hauptverfasser:	He, Feng, Da, Ning, Xue, Junming, Zimmer, Jose
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS 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:	A chemically toughenable or toughened glass has, before chemical toughening, a thickness t of at most 1100 μm. The glass comprises the following components: 45-75 mol-% SiO2; 10-25 mol-% Al2O3; >1-11 mol-% Li2O; 0-15 mol-% P2O5; 0-8 mol-% B2O3; and 0-5 mol-% TiO2. The average number of bridging oxygen per polyhedron (BO) calculated as 24−2(cmol(O)/(cmol(Si)+cmol(Al)+cmol(B)+cmol(P)+cmol(Ti))) is higher than 3.55. Upon chemical toughening, the linear dimension variation in the unit of percentage (V1) is so low that the overall geometry variation (OGV) calculated as (DoL/t)/V1 is higher than 0.8. DoL is the total depth of all ion-exchange layers on one side of the glass and DoL is more than 1 μm, when the glass is chemically toughened with NaNO3 only, KNO3 only or with both KNO3 and NaNO3.