Silica-free, alkali metal-free and lead-free sealing glasses

Details Silica-free, alkali metal-free and lead-free sealing glasses Silica-free, alkali metal-free and lead-free sealing glasses

1975-02-10

1976-07-20

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

C03C 314, C03C 312, C03C 330

Patent

active

039704645

ABSTRACT:
Zinc borate sealing glasses free of silica, alkali metal oxide and lead are disclosed for use in sealing and encapsulation, particularly in connection with semi-conductor devices and electronic components which are sensitive to alkali metal and lead. The glasses have coefficients of thermal expansion in the range of about 35 to 55 .times. 10.sup..sup.-7 /.degree.C, fiber softening temperatures in the range of about 600.degree. to 675.degree.C and annealing point temperatures in the range of about 500 to 580.degree.C.

REFERENCES:
patent: 2254633 (1941-09-01), Tillyer
patent: 2434281 (1948-01-01), Moulton
patent: 2477649 (1949-08-01), Pincus
patent: 3300670 (1967-01-01), Veres

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