LOW-MELTING GLASS FOR MAGNETIC HEADS Russian patent published in 1994 - IPC

FIELD: glass industry. SUBSTANCE: low-melting glass has, wt.-%: vanadium oxide (V₂O₅) 40.44-42.95; lead oxide (PbO) 31.69-34.19; zinc oxide (ZnO) 3.5-4.02; barium oxide (BaO) 3.48-3.97; phosphorus pentoxide (P₂O₅) 0.01-0.39; bismuth oxide (Bi₂O₃) 4.97-8.41; niobium oxide (Nb₂O₅) 5.87-6.60; tantalum oxide(Ta₂O₅) 0.01-0.58; phosphorus 0,41 - 0,67 F′ ; molibdenum oxide 3,01 - 3,92 MoO₃; antimony oxide (Sb₂O₅) 0.01-0.48; boron oxide (B₂O₃) 0.01-0.22, and aluminium oxide (Al₂O₃) 0.01-2.91. Glass properties: coefficient of linear expansion (CLE) is (119-125)·10^-71 degree, microhardness is 290-310 kgf/mm². Glass shows increased crystallization resistance. EFFECT: enhanced quality of glass. 2 tbl