GLASS-CERAMIC MATERIAL WITH A HIGH ELASTIC MODULUS AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2018 - IPC C03C3/95 C03C10/08 C03C10/04 C03B32/02 

FIELD: chemistry.

SUBSTANCE: invention relates to glass-ceramic materials. Glass-ceramic material comprises cordierite and yttrium silicate crystalline phases and is made of glass of compositions in mole %: SiO₂ 46–52, Al₂O₃ 15–18, MgO 15–18, TiO₂ 8–16, Y₂O₃ 4–8. Method comprises synthesizing glasses of composition in mole %: SiO₂ 46–52, Al₂O₃ 15–18, MgO 15–18, TiO₂ 8–16, Y₂O₃ 4–8, for this, the components are mixed to obtain a homogeneous mixture, which is filled into a cooking vessel and placed in a glass furnace. Mixture is melted in a slightly oxidative atmosphere at a temperature of 1,550–1,600 °C for 3–12 hours to homogenize the melt. Then the molten glass is cast on a metal plate and annealed at a temperature of 550–650 °C for 1–3 hours, after which it is inertially cooled. Further, the glass work piece is subjected to a two-stage isothermal heat treatment with a first stage in the temperature range 720–800 °C for 3–24 hours and a second stage in the temperature range 950–1,100°C for 3–24 hours, followed by inertial cooling to room temperature.

EFFECT: elastic modulus is increased up to 190 GPa.

2 cl, 1 dwg, 2 tbl