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Extending the Life and Increasing the Strength of Glass-Ceramic Setter Tiles Used in Substrate Fabrication

IP.com Disclosure Number: IPCOM000036875D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Knickerbocker, JU: AUTHOR [+4]

Abstract

This article discloses a means for greatly reducing the breakage of setter tiles used in ceramic substrate sintering processes.

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Extending the Life and Increasing the Strength of Glass-Ceramic Setter Tiles Used in Substrate Fabrication

This article discloses a means for greatly reducing the breakage of setter tiles used in ceramic substrate sintering processes.

Control of setter tile porosity and flatness is critical to the production of good substrates during sintering operations. Setter tile porosity enables the exchange of product gases with steam during firing, thereby facilitating binder burn-off from the substrate. Flatness allows for uniform load distribution of the conformal weights (pressure) applied to the substrate to restrain x-y shrinkage during firing. However, high setter tile porosity makes the tile structure intrinsically weak. This results in excessive substrate fracturing and loss of the product which is in contact with the tile.

The disclosed technique considerably increases the strength of the setter tile and extends its life. The strength of the tile has been increased by the incorporation of a second compatible material, preferably fibers, within the setter tile matrix. The thermal expansion coefficient of the secondary material must closely match that of the primary tile material itself, i.e., the TCE of Al2O3 (80 x 10-7oC) must be closely matched (in the order of +/- 30) by the TCE of the secondary material. Also, the aspect ratio of the secondary material is very important. Too small an aspect ratio will not result in strengthening the setter tile, while too large...