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Paste Dispersion Test

IP.com Disclosure Number: IPCOM000048789D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Desai, KS: AUTHOR [+2]

Abstract

A process is described which acts to provide a test used to measure paste dispersion/cohesion. In addition, the test can be used to measure paste dryness.

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Paste Dispersion Test

A process is described which acts to provide a test used to measure paste dispersion/cohesion. In addition, the test can be used to measure paste dryness.

Paste dispersion is an important parameter of the paste used in the manufacture of MLC (multilayer ceramic) substrates. The first step of the process involves screening a series of paste dots (e.g., 0.375-inch diameter) on the surface of the MLC green sheet. The paste is then dried at 75 degrees C for two hours, and a plurality of sheets (e.g., 8 (sheets) are laminated with a screened dot pattern located in the middle of the laminated stack. Typically, the sheets are laminated at 75 degrees C under a pressure of 4,000 psi.

The top sheet is arranged to have location marks to identify the location of the dot pattern inside the laminate. Discs, for example, 0.5-inch diameter, are punched from the laminate in the area where the screened dots are located. The disc size should be larger than the dot size to provide a good bond around the metallized dot area. One side of the disc is glued to a ceramic tile using conventional strong bonding glues. Surface roughening of the tile and disc may be required to promote good adhesion. A metal stud is then glued to the other side of the disc, the stud diameter being the same or larger than the disc diameter.

After the sample has dried, a pull test is performed on a standard tensile tester. The magnitude of the force required to separate the paste dot patt...