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Boat For Multilayer Circuit Module Capillary Filling

IP.com Disclosure Number: IPCOM000078270D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Nicolas, J: AUTHOR

Abstract

Ceramic multilayer circuit modules (MLC) have their via holes capillary filled by copper from a melted copper bath, under a hydrogen atmosphere. To ease the operation consisting of dipping the modules in the melted copper bath, a convenient boat is described. Basically, the boat 10 comprises a cylinder closed at one end, in the opening of which a jig may be introduced. As shown in Fig. 1, the jig comprises two elements; the first element 11 receives a plurality of vertical oriented modules 12 clamped by rods 13, therefore, the main surfaces of the modules are substantially perpendicular to the generatrices of the cylinder; and a second element 14 operates to firmly maintain the modules in their respective positions.

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Boat For Multilayer Circuit Module Capillary Filling

Ceramic multilayer circuit modules (MLC) have their via holes capillary filled by copper from a melted copper bath, under a hydrogen atmosphere. To ease the operation consisting of dipping the modules in the melted copper bath, a convenient boat is described. Basically, the boat 10 comprises a cylinder closed at one end, in the opening of which a jig may be introduced. As shown in Fig. 1, the jig comprises two elements; the first element 11 receives a plurality of vertical oriented modules 12 clamped by rods 13, therefore, the main surfaces of the modules are substantially perpendicular to the generatrices of the cylinder; and a second element 14 operates to firmly maintain the modules in their respective positions.

The cylinder may be closed by a cap. All parts constituting the boat 10 may be made of graphite. The boat is associated with a fork which allows it to rotate within a furnace 15 heated to the desired temperature

Referring to Fig. 2 which represents a schematic cross section of the boat 10 during the processing: in A, the initial state where cylindrical 10 has been filled with melted copper 16, modules 12 are located at the upper side of the cylinder by the rods 13. In B, after the boat has been rotated 180degrees, the modules are dipped in the melted copper and the capillary filling takes place. In C, after a reverse rotation of 180degrees, the boat is returned to its initial position. This operatio...