Field-assisted bonding method and articles produced thereby

Details Field-assisted bonding method and articles produced thereby Field-assisted bonding method and articles produced thereby

1985-06-24

1987-02-17

Kellogg, Arthur

Chemistry: physical processes

65 36, 65 43, 65 5921, 65 5922, 350344, C09K 334, C23C 2700

Patent

active

046435328

ABSTRACT:
Disclosed is an electric field-assisted method for bonding one glass (or other inorganic insulator) body, typically a plate, to a similar body, such that the two bodies are spaced apart. The interior volume of such a composite body is advantageously filled with liquid crystal material, to produce a liguid crystal display cell. The method comprises forming a patterned layer of an appropriate bonding material (e.g., Al, Ge, Si, preferably Si) on a major surface of one of the two insulator bodies, placing a major surface of the second insulator body into contact with the bonding material, heating at least the second body to a bonding temperature (typically in the range 250.degree.-600.degree. C.), and applying a voltage (e.g., 500-1500 volt DC, the second body negative) across the thus formed sandwich. This procedure results in formation of a strong bond between the bonding material and the second body, does not require electrical contact to the bonding material, permits the bonding of bodies whose coefficients of thermal expansion differ substantially from that of the bonding material, and can produce liquid crystal cells of closely controlled, uniform cell thickness.

REFERENCES:
patent: 3397278 (1968-08-01), Pomerantz
patent: 4097309 (1978-06-01), Horne
patent: 4239345 (1980-12-01), Berreman et al.
patent: 4269617 (1981-05-01), Shibuya et al.
patent: 4362771 (1982-12-01), Umeda et al.
patent: 4367924 (1983-01-01), Clark et al.
patent: 4452624 (1984-06-01), Wohlttjen
Journal of Applied Physics, vol. 40(10) Sep. 1969, "Field Assisted Glass-Metal Sealing" by George Wallis et al, pp. 3946-3949.
Proceedings of the IEEE, vol. 70, No. 5, May 1982, "Silicon as a Mechanical Material" by K. E. Petersen, pp. 420-457.
Glass-To-Metal Seals by J. H. Partridge, 1949--Foreword.

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