Silver-filled glass

Details Silver-filled glass Silver-filled glass

1983-05-16

1984-03-13

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of quartz or glass

357 80, 357 67, 357 75, 361400, 361411, 428428, 428433, 428434, 428446, 428450, 428209, 428210, 428701, 428702, B32B 1706, B22F 702, C03C 310

Patent

active

044367856

ABSTRACT:
A silver metallizing paste for attachment of silicon semi-conductive devices in lead-frame packages, specifically ceramic packages, which is less expensive than a gold preform but useable in hermetic packages, and provides better electrical and thermal conductivity, and higher bond strength, than silver polyimides. From 25 to 95% of silver is blended with a low-melting glass, preferably one having 95-96% PbO, and a paste or ink is formed with a suitable vehicle at 75-85% solids. Use of the paste follows conventional practice. Selection of Ag:glass ratio depends on the type of die bonding to be used. The paste is particularly useful in MOS technology, where low contact resistance is required, and also finds applications as a solder substitute and bonding chip capacitors. It is most advantageous in attachment of larger-area integrated circuits in that stress cracking associated with the gold-silicon eutectic is avoided.

REFERENCES:
patent: 2385580 (1945-09-01), Knox
patent: 2530317 (1950-11-01), Bain
patent: 3047409 (1962-07-01), Slayter et al.
patent: 3207706 (1965-09-01), Hoffman
patent: 3440182 (1969-04-01), Hoffman
patent: 3480566 (1969-11-01), Hoffman
patent: 3484284 (1969-12-01), Pates
patent: 3497774 (1970-02-01), Hornberger
patent: 3944696 (1976-03-01), Larry
patent: 3975201 (1976-08-01), Greenstein
patent: 4002799 (1977-01-01), Dumesnil
patent: 4032350 (1977-06-01), Greenstein
patent: 4054714 (1977-10-01), Mastrangelo
patent: 4101710 (1978-07-01), Marcus
patent: 4135038 (1979-01-01), Takami
patent: 4142203 (1979-02-01), Dietz
Geller, R. F. et al., "Some Soft Glazes of Low Thermal Expansion", J. of Research of Nat'l. Bureau of Standards, 20, Jan. 1938, pp. 57-66.
Scramaglia, R., "Powder Properties Affect Fired Film", Ceramic Industry, 119 (5), Nov. 1982, pp. 44-46.
Greenwood, R. W., "Silver Bearing Conductive Pastes", IBM Tech. Disclosure Bull., Jul. 1974, (2), p. 437.

Affiliated with

Also associated with

Rating

Silver-filled glass does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Silver-filled glass, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Silver-filled glass will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-492128