Browse Prior Art Database

Constructing a Ceramic Module with Internal Glass Plane

IP.com Disclosure Number: IPCOM000075327D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Norris, KC: AUTHOR [+2]

Abstract

This ceramic module with an internal plane of low-conductivity material, such as glass, adjacent to the buried heaters can provide a reduced thermal resistance in the direction of the solderable connections so that less power is required for the reflow operation, and smaller temperature gradients will exist across the surface of the module.

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Constructing a Ceramic Module with Internal Glass Plane

This ceramic module with an internal plane of low-conductivity material, such as glass, adjacent to the buried heaters can provide a reduced thermal resistance in the direction of the solderable connections so that less power is required for the reflow operation, and smaller temperature gradients will exist across the surface of the module.

Two methods are contemplated. The first comprises the following steps:

a) Process a ceramic piece 2 so that it is fired and contains the appropriate metallurgy, including a screened and fired heater 3 on one side. The minimum thickness for a fired ceramic piece, for process handling purposes is approximately 20 mils. Attach solderable connections 1 on the other side, and add metal studs 5 for electrical connection between the pieces.

b) Process a second ceramic unit 6 so that it is fired and contains appropriate metallurgy and via studs for electrical connections between the pieces.

c) Spread the glass slurry 4 needed to obtain half the desired glass thickness over each piece of ceramic and fire the glass.

d) Lap the fired glass surface back to expose the via studs.

e) Align the ceramic pieces and fire again. Some special fixturing may be required to prevent lateral motion of the pieces while joining them, and it may be necessary to apply a weight to the sandwich to promote good contact. A second method comprises:

a) Process a ceramic piece 2 so that it is fired and conta...