Transparent glass ceramics that can be darkened by adding...

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

C03C 10/12 (2006.01) C03C 4/02 (2006.01) C03C 10/00 (2006.01)

Patent

CA 2422405

The invention relates to transparent glass ceramics that can be darkened by adding vanadium oxide, said glass ceramics containing high-quartz mixed crystals as the major crystal phase. The invention further relates to a method for producing said glass ceramics and to various uses thereof. The inventive transparent glass ceramics that contain high-quartz mixed crystals as the major crystal phase and that can be darkened by adding vanadium oxide are characterized in that the glass ceramics, except for unavoidable traces, contain none of the chemical refining agents arsenic oxide and/or antimony oxide. The darkened glass ceramics are further characterized by a light transmission factor in the visible range of .tau. < 5 % and an IR transmission factor at 1600 nm of greater 65 % for glass ceramics of 4 mm thickness. Said transmission factors are adjusted by combining the vanadium oxide as the colorant with at least one solid, liquid and/or gaseous reducing agent added to the glass melt.

Vitrocéramiques transparentes foncées à l'aide d'un ajout d'oxyde de vanadium, qui comportent des cristaux mixtes de quartz haute température en tant que phase cristalline prédominante, et procédé de fabrication desdites vitrocéramiques ainsi que leur utilisation. Selon la présente invention, ces vitrocéramiques transparentes foncées à l'aide d'un ajout d'oxyde de vanadium, qui comportent des cristaux mixtes de quartz haute température en tant que phase cristalline prédominante, ne contiennent pas, à part les traces inévitables, de trioxyde de diarsenic et / ou de trioxyde de diantimoine en tant qu'agents chimiques d'affinage. Ces vitrocéramiques foncées possèdent un facteur de transmission dans la plage visible de .tau. < 5 % et un facteur de transmission des IR à 1600 nm supérieur à 65 % pour une vitrocéramique de 4 mm d'épaisseur. Lesdits facteurs de transmission sont obtenus par une combinaison de l'oxyde de vanadium en tant que colorant et d'au moins un réducteur solide, liquide et / ou gazeux ajouté au verre en fusion.

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