FUSIBLE GLASS FOR CONNECTION OF PARTS Russian patent published in 1995 - IPC

FIELD: radio engineering, electronics. SUBSTANCE: invention refers to compositions of glasses used in manufacture of magnetic heads for videorecording and computation equipment. For increase of crystallization stability and microhardness of glass while joining compounds of ceramic and metal elements of magnetic heads glass includes following components, per cent by mass: V₂O₅ 49.0-60.0; B₂O₃ 0.01-1.1; PbO 4.5-11.0; ZnO 0.01-0.9; BaO 0.01-1.0; P₂O₅ 16.0-20.0; Sb₂O₅ 13.0-25.0; BI₂O₃ 0.01-2.5; CuO 0.001-0.1. Coefficient of thermal expansion of glass is (81-86)·10^-71/deg, T_o=318-336 C, T_n.d= 352-368 C, T_melt= 370-385 C; T_gr=480-495 C, microhardness is 363-390 kgf/mm². Time for emergence of first symptoms of crystallization on surface of spreading drop of glass is 50-65 min. EFFECT: improved efficiency of process.