Browse Prior Art Database

NUMBER 42 ALLOY SEAL GLASS

IP.com Disclosure Number: IPCOM000005508D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2001-Oct-10
Document File: 1 page(s) / 33K

Publishing Venue

Motorola

Related People

Earl Davis: AUTHOR [+3]

Abstract

The composition of a glass that makes possible seals to #42 alloy in TO-5 headers that overcomes a cracking difficulty often encountered in glass seals to#42 alloy because the expansion curve of therY42 alloy deviates from a straight line far more than does the expansion curve of a glass.

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MOTOROLA Technlcal Developments Volume 3 March 1983

NUMBER 42 ALLOY SEAL GLASS

By Earl Davis, Robert W. Hey, Robert M. Wentworth

   The composition of a glass that makes possible seals to #42 alloy in TO-5 headers that overcomes a cracking difficulty often encountered in glass seals to#42 alloy because the expansion curve of therY42 alloy deviates from a straight line far more than does the expansion curve of a glass.

The glass composition in weight percent is Si02 64.5, Al203 8.0, K20 4.5, Na20 4.0, Li20 1.0, BaO
4.0, SrO 4.0, CaO 5.5, MgO 1.0 and B2O3 3.5.

The glass has a softening point of 740°C and an expansion of 71 x 1g7/"C (ave. 25.3OO'C). The glass makes possible the substitution of #42 alloy for the more expensive F-15 alloy in TO-5 headers.

0 Motorola, Inc. 1963 70

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