GLASS-CERAMIC MATERIAL OF SPINEL TYPE FOR PRODUCTION OF COSTUME JEWELLERY AND JEWELLERY STONES Russian patent published in 2024 - IPC C03C10/02 C03C3/66 B44C5/06 B82Y40/00 

FIELD: synthetic jewellery.

SUBSTANCE: invention is related to a glass-ceramic material for production of synthetic stones for costume jewellery and jewellery, available in a wide range of colours, reliably imitating natural precious stones, due to the high content of the crystalline phase of spinel and the low content of SiO₂. The glass-ceramic material contains at least 20% of the nanocrystalline spinel phase and has the following composition, in wt.%: SiO₂ from 20 to 40, B₂O₃ from 1.5 to 10, Al₂O₃ from 20 to 35, MgO from 0.1 to 20, ZnO from 0.1 to 20, where the content of MgO + ZnO is according to at least 10%. The glass-ceramic material may additionally contain a nucleating agent, in wt.%: ZrO₂ from 0.5 to 15 and TiO₂ from 0 to 15, where the content of TiO₂+ZrO₂ is at least 5%, for controlled crystallization of the crystalline phases ZrO₂ and ZrTiO₄ in the volume of glass-ceramic material, as well as from 0 to 20 wt.% of colouring additives in form of CoO, NiO, CuO, Fe₂O₃, MnO₂, Cr₂O₃, V₂O₅, Pr₂O₃, CeO₂, Nd₂O₃, Er₂O₃, AgO and Au.

EFFECT: material has excellent mechanical properties, chemical resistance and heat resistance.

6 cl, 2 tbl, 1 dwg