Other

International Business Machines Corporation

Rebecca P Fleming

Arnold F Schmeckenbecher

Joseph M Harvilchuck

John James Gniewek

Donald W Baudrand

Chandrika Prasad

Samuel Lawhorne, Jr

John J Mele

A process for simultaneously selectively depositing a high purity nickel containing alloy (i.e. a nickel-boron alloy having a nickel content in excess of 99.5 percent) over a preformed metallurgy pattern (including the individual, electrically isolated contact pads and the seal band area thereon) on the top-side dielectric surface of a multi-layer ceramic module. The metallurgy pattern on such top-side surface of such module is appropriately catalyzed and then immersed in a bath which is essentially lead-free and which includes a source of nickel ions, a borane reducing agent, and an effective amount of an organic divalent sulfur compound, preferably thiodiglycollic acid. The contact pads and the seal band area so plated exhibit an exceptionally uniform layer of nickel-boron alloy, free of surface irregularities, which layer is characterized by low contact resistance, excellent wire bonding and eutectic diode bonding characteristics and is both crack-free at the time of its being deposited and remains crack-free under brazing conditions throughout the life of the component.

Process for selectively depositing a nickel-boron coating over a

A method of providing a stress-free metal layer by electroless plating techniques, including the steps of (1) providing a substrate that includes some glass material in at least the surface areas to receive a metal layer, (2) depositing a layer of metal-boron by electroless plating techniques, and (3) heating the resultant metal-boron layer in a non-reacting and/or H.sub.2 environment at a temperature of at least 750.degree. C. for a time sufficient to diffuse the boron to the glass material in the substrate.

Process for producing an improved quality electrolessly deposited nickel

Growing community of inventors

Fairfax Station, VA, United States of America

Rebecca P Fleming