LOW-MELTING GLASS FOR JOINING MAGNETIC HEAD COMPONENTS Russian patent published in 1994 - IPC

FIELD: glass compositions. SUBSTANCE: the glass comprises (mole %): 53-58 SiO₂; 15-19 B₂O₃; 9-16 Na₂O; 8-12.3 LiO₂; 0.1-2 ZnO; 0.2-1 Al₂O₃; 0.2-4 ZrO₂; 0.2-3 V₂O₅ or CrO₃; 0.1-2 MgO; 0.1-2 Nb₂O₅; 0.01-0.3 Sb₂O₃; 0.1-2.5 PbO or Bi₂O₃. The glass spreading temperature 725-730 C; the coefficient of linear thermal expansion (83-104) x (83-104)×10^-7·grade^-1. The sample weight losses on boiling in a 1 N aqueous soda solution 0,12-0,25mg/cm²/hr and at room temperature in a 5 % aqueous solution of oxalic acid 0,15-0,25mg/cm²/hr. EFFECT: improved chemical resistance of glass to alkali- and acid-containing solutions. 2 tbl