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High Cohesive Strength Paste

IP.com Disclosure Number: IPCOM000049880D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Desai, KS: AUTHOR [+3]

Abstract

The cohesive strength of the laminate paste used in MLCs (multilayer ceramics) is improved to reduce delamination of substrates. This is achieved by extending the milling passes in the paste milling process used to fabricate the paste.

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High Cohesive Strength Paste

The cohesive strength of the laminate paste used in MLCs (multilayer ceramics) is improved to reduce delamination of substrates. This is achieved by extending the milling passes in the paste milling process used to fabricate the paste.

Prevention of delamination may be achieved by using a paste with a high cohesive strength in the screened and dried state.

When standard paste is tested for cohesion using the dot pattern test, the bond strength has been found to be low with failure in the paste pattern. By extending the milling passes on a three-roller mill, for example, the cohesive strength of a screened and dried paste deposit is greatly enhanced.

The milling is achieved by using. for example, a Kent 6X14 three roller mill with a pass/pressure schedule, as shown below: Passes Pressure

(psi gauge)

Front Rear

1 - 2 500 500

3 - 5 700 700

6 - 7 800 700

8 - 10 900 800

11 - 12 1,000 900

13 - 17 1,100 1,000

It should be appreciated that the exact milling schedule will depend on the equipment used, the paste formulation, and the lot size as well as other parameters, such as temperature and pre-mixed quality.

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