GLASS FOR GLASS CERAMIC CEMENT Russian patent published in 2004 - IPC

FIELD: glass industry.

SUBSTANCE: invention relates to glass used for glass ceramic cement that is designated for soldering and hermetic sealing in instrument making industry, electronic technique and radioelectronics, in particular, in manufacturing sensitive members in quartz resonators. Glass comprises components taken in the following ratio, wt.-%: PbO, 9.0-35.6; ZnO, 3.2-10.0; B₂O₃, 4.2-4.6; Bi₂O₃, 55.8-75.5; SiO₂, 1.2-1.3. Glass ceramic cement temperature coefficient of linear expansion is (130 ± 5) x 10^-7K^-1, crystallization and soldering point is 470-490^oC, deformation point is 650^oC, shifting strength is 45 MPa. Invention provides enhancing adhesion strength and expanding range of resonator working temperature values.

EFFECT: improved and valuable properties of glass.

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