SYNTHETIC MATERIAL FOR JEWELLERY INDUSTRY AND METHOD OF ITS PRODUCTION Russian patent published in 2011 - IPC A44C17/00 A44C27/00 

FIELD: personal use articles.

SUBSTANCE: group of inventions relates to materials for jewellery industry, in particular, to synthetic materials that serve to replace natural jewellery stones, and to method of their production. A synthetic coloured or colourless, transparent, semi-transparent or non-transparent composite nanocrystalline material is proposed for jewellery industry on the basis of nanosize oxide and silicate crystalline phases. The material comprises at least one of the crystalline phases listed below: spinel, quartz-like phases, sapphirine, enstatite, petalite-like phase, cordierite, villemite, zircon, rutile, zircon titanate, zircon dioxide. Material colour is provided by ions of transition, rare-earth elements and noble metals in amount from 0.001 to 4 mol%. The method of material production includes melting of initial selected mixture of components at the temperature that is 200-300°C higher than liquidus, cooling of melted material down to the temperature of 1300-1450°C with giving it the necessary shape, baking at the temperature of 640-700°C, when material viscosity is equal to 10^10.5-10¹¹ Pa·s, and subsequent additional thermal treatment at the temperature from 680 to 850°C within 1-24 hours, then at the temperature from 900 to 1200°C within 1-24 hours.

EFFECT: group of inventions provides for hardness, chemical resistance and stability of material colour to thermal shocks.

3 cl, 2 tbl