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Browse Prior Art Database

Protective/Thru Solderable Coatings on Metallized Ceramic Components

IP.com Disclosure Number: IPCOM000081574D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Ciancanelli, JM: AUTHOR [+3]

Abstract

Case I: A metallized ceramic substrate can be electrocoated at an early stage before solder joining the integrated circuit (IC) chip. The electrocoating process allows development of a tight, well adherent coating developed selectively on powered conductors. The process is also economical and efficient as a coating process.

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Protective/Thru Solderable Coatings on Metallized Ceramic Components

Case I: A metallized ceramic substrate can be electrocoated at an early stage before solder joining the integrated circuit (IC) chip. The electrocoating process allows development of a tight, well adherent coating developed selectively on powered conductors. The process is also economical and efficient as a coating process.

In order to address a subsequent soldering operation, the coating is formulated so as to possess properties of nonflamm ability, general chemical and solvent resistance, and localized thru-solderability. This is accomplished by considering in formulation those organic dielectric, polymers of the vinyl type such as acrylics and styrene (also in certain cases polyurethane), which have the desirable feature of clean depolymerization at higher temperatures to a gaseous volatilization of products. The material formulation also includes an inert component such as TEFLON*, in order to allow the other properties of chemical and solvent resistance and nonflammability to be enhanced. A reasonable formulation as an example would be a 75/25 acrylic/TEFLON* ratio as a codispersion blend.

On the other hand, by considering sufficiently thin coatings of about 0.1 - 0.5 mil level, a pure high-temperature polymer coating could be utilized with protective properties as well as with thru-solderability. The latter property would be realized generally with sufficiently thin organic polymer coating...