Browse Prior Art Database

Actuation Tab and Tab Attach Metallurgy

IP.com Disclosure Number: IPCOM000043254D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hamilton, G: AUTHOR [+2]

Abstract

Present methods of bond attachment to MLC (multilayer ceramic) substrates require that nickel-gold plated KOVAR* devices (actuating tabs) be brazed to the molydbenum-nickel-gold metallized substrates through the use of gold-tin preforms in order that minimum post-brazed shear strength test limits be met. The improved tab attach metallurgy system here disclosed eliminates the use of a more expensive gold-plating and gold-tin preform while continuing to provide bonds having equivalent strengths and tighter distribution ranges. This is accomplished by directly plating the KOVAR tab with nickel, using standard electroplating or electroless Ni-P processes with the diffusion of nickel and KOVAR done in the 400 to 650ŒC range.

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Actuation Tab and Tab Attach Metallurgy

Present methods of bond attachment to MLC (multilayer ceramic) substrates require that nickel-gold plated KOVAR* devices (actuating tabs) be brazed to the molydbenum-nickel-gold metallized substrates through the use of gold-tin preforms in order that minimum post-brazed shear strength test limits be met. The improved tab attach metallurgy system here disclosed eliminates the use of a more expensive gold-plating and gold-tin preform while continuing to provide bonds having equivalent strengths and tighter distribution ranges. This is accomplished by directly plating the KOVAR tab with nickel, using standard electroplating or electroless Ni-P processes with the diffusion of nickel and KOVAR done in the 400 to 650OEC range. A tin-lead preform is then placed between the tab and the metallized substrate pad, and the tab-attach assembly joined during the same heating operation used for I/O pin-substrate attachment. * Trademark of Westinghouse Electric Corporation.

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