Metallized ceramic substrate and method therefor

Details Metallized ceramic substrate and method therefor Metallized ceramic substrate and method therefor

1990-04-23

1992-03-31

Robinson, Ellis P.

Stock material or miscellaneous articles

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428209, 428210, 428432, 428140, 428698, 428627, 428632, 428901, B32B 310

Patent

active

051007142

ABSTRACT:
A metallized ceramic substrate having an enhanced bond strength between the ceramic substrate and a conductive metal layer bonded thereto is disclosed. The metallized ceramic substrate includes a heterogeneous juncture band between a ceramic workpiece and a layer of electrically conductive material. A process for making the metallized ceramic substrate is also disclosed. The process includes an acid etchant step that increases the actual surface area of the treated surface of the ceramic workpiece without undermining the integrity of the ceramic surface while at the same time selectively attacking vitreous binder phase present between substrate grains and creating even deeper penetration at the relatively higher energy triple point junctures. In this manner, metal anchor sites that enhance adhesion are provided. During subsequent high temperature firing these anchors hold the resulting composite together as a chemical bond is formed in addition to a mechanical bond or interlock.

REFERENCES:
patent: 3091548 (1963-05-01), Dillon, II
patent: 3404020 (1968-10-01), Woolley
patent: 3975165 (1976-08-01), Elbert
patent: 4055451 (1977-10-01), Cockbain
patent: 4109031 (1978-08-01), Marscher
patent: 4287253 (1981-09-01), Leech
patent: 4338380 (1982-07-01), Erickson
patent: 4360570 (1982-11-01), Andreades
patent: 4414281 (1983-11-01), Hoda
patent: 4500383 (1985-02-01), Kashiwagi
patent: 4981761 (1991-01-01), Ookouchi

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