GLASS HARDENED BY ION EXCHANGE Russian patent published in 2020 - IPC C03C3/87 C03C3/93 C03C21/00 

FIELD: glass.

SUBSTANCE: invention relates to glass compositions reinforced by ion exchange and intended for making articles having high strength and optical characteristics. Such articles are used as glazing of aircraft, automobile, railway, water and other types of transport. Glass hardened by ion exchange contains SiO₂, Al₂O₃, K₂O, MgO, Na₂O, CaO, B₂O₃, P₂O₅, ZnO, Sb₂O₃, Na₂SiF₆ and Fe₂O₃ with following content of components, wt. %: SiO₂ 55.0–62.0; Al₂O₃ 11.0–16.0; K₂O 1.5–3.5; MgO 1.4–4.5; Na₂O 14.0–16.0; CaO 0.01–1.0; B₂O₃ 0.001–3.0; P₂O₅ 0.001–2.0; ZnO 3.0–8.3; Sb₂O₃ 0.1–2.5; Na₂SiF₆ 0.1–2.0; Fe₂O₃ 0.001–0.2.

EFFECT: technical result is obtaining glass, which as a result of hardening by ion exchange has a greater depth of compressed layer with shorter duration of hardening process.

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