LITHIUM SILICATE GLASS CERAMIC AND GLASS CONTAINING TRANSITION METAL OXIDE

• Main Authors: HOELAND WOLFRAM PROF DR, RITZBERGER CHRISTIAN, SCHWEIGER MARCEL, RHEINBERGER VOLKER DR
• Format: Patent
• Language: English; Japanese
• Published: 26.05.2016
• Subjects: APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; DENTISTRY; GLASS; HUMAN NECESSITIES; HYGIENE; JOINING GLASS TO GLASS OR OTHER MATERIALS; MEDICAL OR VETERINARY SCIENCE; METALLURGY; MINERAL OR SLAG WOOL; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

PROBLEM TO BE SOLVED: To provide a lithium silicate-based glass ceramic capable of easily changing refractive index without practically deteriorating other properties.SOLUTION: There is provided a lithium silicate glass ceramic containing at least 8.5 wt.% of transition metal oxide selected from a group consisting of oxide of yttrium, oxides of transition metals consisting of Y, Nb, La, Ta and W having atomic number of 41 to 79 and a mixture of these oxides and containing, by mass%, SiOof 54.0 to 80.0%, LiO of 11.0 to 19.0%, alkali metal oxides consisting of KO, CsO and RbO of 0.5 to 13.5%, alkali earth metal oxides consisting of CaO, BaO, MgO and/or SrO of 0.1 to 5.0% and a nucleating agent selected from PO, TiOand/or a metal.SELECTED DRAWING: None 【課題】屈折率が容易に変更可能であるが、他の特性は実質的に損なわれない、ケイ酸リチウムベースのガラスセラミックを提供する。【解決手段】少なくとも８．５重量％の遷移金属酸化物を含有するケイ酸リチウムガラスセラミックであって、該遷移金属酸化物は、イットリウムの酸化物、４１〜７９の原子番号を有するＹ、Ｎｂ、Ｌａ、Ｔａ、Ｗよりなる遷移金属の酸化物およびこれらの酸化物の混合物からなる群より選択され、質量％でＳｉＯ２５４．０〜８０．０％、Ｌｉ２Ｏ１１．０〜１９．０％、Ｋ２Ｏ、Ｃｓ２Ｏ、Ｒｂ２Ｏからなるアルカリ金属酸化物を０．５〜１３．５％、ＣａＯ、ＢａＯ、ＭｇＯおよび／またはＳｒＯからなるアルカリ土類金属酸化物を０．１〜５．０％、Ｐ２Ｏ５、ＴｉＯ２および／または金属から選択される造核剤を含有するケイ酸リチウムガラスセラミック。【選択図】なし