LOW-TEMPERATURE GLASS-CERAMIC MATERIAL AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2020 - IPC C03C10/00 C04B35/111 C04B41/85 

FIELD: chemistry.

SUBSTANCE: invention relates to production of glass-ceramic composite material. Disclosed glass-ceramic material contains low-temperature crystallisable glass and aluminium oxide ceramics at ratio of (1.4–1.0):(0.6–1.0), respectively. Low-temperature crystallising glass additionally contains chromium oxide at the following ratio of components, wt. %: SiO₂ 20–34, BaO 34–40, B₂O₃ 23–26, CaO 1–10, SnO₂ 1–10, as well as over 100% chromium oxide (Cr₂O₃) 2–5 and aluminium oxide (Al₂O₃) 5–10. Prior to composition of the mixture, aluminium oxide and chromium oxide are pre-mixed and calcined at 1300–1400 °C. Low-temperature glass-ceramic material after mixing with organic binder and moulding in the form of articles with current-conducting elements (cermet body, metal-ceramic plate) are combined to anneal organic ligament at temperature 700–800 °C, additionally addition of phosphorus oxide (P₂O₅) by impregnating in an aqueous solution of orthophosphoric acid (H₃RO₄), air-dried and cured without flame shrinkage at 300–900 °C for 0.5–2 hours. At the same time there is stabilization of thermomechanical and dielectric properties of material and active crystallisation of matrix glass to produce non-shrinking ceramics.

EFFECT: invention can be used in electrical engineering and radio engineering, in production of housings and substrates for integrated circuits and multilayer ceramic boards of multi-crystal ceramic modules.

3 cl, 2 tbl