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Infrared Brazing

IP.com Disclosure Number: IPCOM000062114D
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Kapur, S: AUTHOR [+3]

Abstract

A change in the brazing operation used to attach pins to pads on glass/ ceramic (G/C) substrates has been proposed which would use infrared heating as opposed to a slow furnace method. The new method provides a strong connection with fewer ceramic failures than heretofore. In standard brazing procedures thermal conduction module (TCM) pins are joined to basic storage module (BSM) I/O pads on ceramic substrates used in semiconductor devices. A belt furnace is normally used with the substrate in a braze boat passing through a slow uniform heating and slow cooling cycle. The procedure takes about 40 minutes. The proposal suggests the use of an infrared (IR) lamp properly mounted which produces radiation that preferentially heats the substrate.

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Infrared Brazing

A change in the brazing operation used to attach pins to pads on glass/ ceramic (G/C) substrates has been proposed which would use infrared heating as opposed to a slow furnace method. The new method provides a strong connection with fewer ceramic failures than heretofore. In standard brazing procedures thermal conduction module (TCM) pins are joined to basic storage module (BSM) I/O pads on ceramic substrates used in semiconductor devices. A belt furnace is normally used with the substrate in a braze boat passing through a slow uniform heating and slow cooling cycle. The procedure takes about 40 minutes. The proposal suggests the use of an infrared (IR) lamp properly mounted which produces radiation that preferentially heats the substrate. The lamp is directed through a quartz braze boat supporting the substrate to preferentially heat the substrate since the major portion of the radiation is reflected from the pins. The absorption spectra of G/C to IR radiation is particularly suitable for this approach with heating taking place very rapidly. The time required to achieve the IR brazing is on the order of 10 seconds. The proposed method not only improves production time, it provides improved pin joins with fewer rejects due to failure of the G/C.

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