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Process for Simultaneously Braze Joining Contact Pins and Frame to Ceramic Substrates

IP.com Disclosure Number: IPCOM000048150D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Palmateer, PH: AUTHOR [+2]

Abstract

This process can be used to join large numbers of I/O pins and a rectangular mounting frame on a ceramic substrate without subjecting the elements to unduly high temperatures.

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Process for Simultaneously Braze Joining Contact Pins and Frame to Ceramic Substrates

This process can be used to join large numbers of I/O pins and a rectangular mounting frame on a ceramic substrate without subjecting the elements to unduly high temperatures.

The process utilizes a graphite brazing boat 10 formed of two parts 12 and
14. In the upper surface of element 12 are formed apertures 16 to accept pins 18 that will be joined to ceramic substrate 20. An enlarged recess 22 contains a pin weight 24. The graphite material of boat 10 is selected to substantially match the thermal coefficient of expansion of the substrate 20. After the pins 18 have been loaded into boat 10, a rectangular frame 26 is located on frame 28, as indicated in Fig. 1.

Braze pre-form 30 is positioned on frame 26 which is provided with dimples 32 to maintain a spacing between the substrate 20 over the areas in which the pins 18 are to be joined, as indicated in Fig. 2. As indicated in Fig. 3, the substrate alignment fixture 36 is positioned over part 12 and maintained in alignment therewith by pins 40 which extend through apertures in alignment frame 36. The substrate 20 is subsequently placed, with the paste areas 34 facing downwardly, into the opening 42 in frame 36.

The substrate 20 is now aligned with the pins in boat 10 and the frame 26. The spacer plate 44 is put in place over substrate 20, a cover plate 46 deposited over plate 44, and the assembly then bolted together to insure t...