Low temperature sealing glasses

摘要: Lead borate and lead zinc glasses containing from 0.1 to 10% by weight cuprous oxide (Cu2 O) fluoride, the molar ratio of fluoride being in range 1:0.25 1:10, preferably 1:1 1:5, up 5% bismuth 5.0% alumina are disclosed. These mixed with particulate titanate amounts about 56% volume. mixtures have very low coefficients thermal expansion useful for bonding ceramic, glass metal parts together at temperatures. They especially as semiconductor package sealants.