MICROCRYSTALLINE GLASS, ARTICLE FROM MICROCRYSTALLINE GLASS AND METHOD OF THEIR PRODUCTION Russian patent published in 2024 - IPC C03C10/04 C03C3/83 C03B32/02 C03C21/00 

FIELD: glass industry.

SUBSTANCE: present invention relates to microcrystalline glass and an article made from it, which can be used as a glass cover plate in display devices and electronic devices. Microcrystalline glass article contains the following components in percentage by weight: SiO₂: 45–70%; Al₂O₃: 8–18%; Li₂O: 10–25%; ZrO₂: 5–15%; P₂O₅: 2–10%; Y₂O₃: 0.34–5.8%, wherein (Li₂O+ZrO₂+P₂O₅)/Y₂O₃ is 8.5–50.0%. Microcrystalline glass composition can additionally contain the following components in percentage by weight: K₂O: 0–5%; and/or MgO: 0–2%; and/or ZnO: 0–2%; and/or Na₂O: 0–6%; and/or SrO: 0–5%; and/or BaO: 0–5%; and/or CaO: 0–5%; and/or TiO₂: 0–5%; and/or B₂O₃: 0–5%; and/or Ln₂O₃: 0–5%; and/or clarifying agent: 0–2%, where said Ln₂O₃ is one or more of La₂O₃, Gd₂O₃, Yb₂O₃, the clarifying agent is one or more of Sb₂O₃, SnO₂, SnO, CeO₂, F, Cl and Br. An article from microcrystalline glass is obtained by crystallisation with subsequent chemical hardening.

EFFECT: microcrystalline glass and a microcrystalline glass article provided by the present invention have excellent mechanical and optical properties.

33 cl, 12 dwg