NON-ALKALI GLASS

• Main Authors: TOKUNAGA HIROFUMI, ONO KAZUTAKA, AKIYAMA JUN
• Format: Patent
• Language: English; Japanese
• Published: 07.11.2019
• Subjects: 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

To provide a non-alkali glass that is a glass having low thermal shrinkage, wherein there is less trouble caused by BHF, the productivity is good, and thermal shrinkage is low.SOLUTION: The present invention pertains to the non-alkali glass which has a strain point of 680°C or more, a glass transition point of 730°C or more and an average thermal expansion coefficient at 50-350°C of 30×10to 45×10/°C, contains, expressed by mass% in terms of oxides, SiO: 54-66%, AlO: 10-27%, BO: 0.2-5.5%, MgO: 0-10%, CaO: 0-15%, SrO: 0-15%, BaO: 0-15%, MgO+CaO+SrO+BaO: 8-25%, and NaO of 600 mass ppm or less, and has a mass ratio (NaO/BO) of NaO and BOof 0.001-0.3 inclusive.SELECTED DRAWING: None 【課題】低い熱収縮率のガラスにおいて、ＢＨＦによる問題が発生しにくく、生産性がよく、かつ熱収縮率が低い無アルカリガラスの提供。【解決手段】 歪点が６８０℃以上であり、ガラス転移点が７３０℃以上であり、５０〜３５０℃での平均熱膨張係数が３０×１０−７〜４５×１０−７／℃であり、酸化物基準の質量％表示で、ＳｉＯ２：５４〜６６％、Ａｌ２Ｏ３：１０〜２７％、Ｂ２Ｏ３：０．２〜５．５％、ＭｇＯ：０〜１０％、ＣａＯ：０〜１５％、ＳｒＯ：０〜１５％、ＢａＯ：０〜１５％、ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯ：８〜２５％を含有し、かつ、Ｎａ２Ｏを６００質量ｐｐｍ以下含有し、Ｎａ２ＯとＢ２Ｏ３との質量比（Ｎａ２Ｏ／Ｂ２Ｏ３）が０．００１以上０．３以下である無アルカリガラス。【選択図】なし