Metal working – Method of mechanical manufacture – Electrical device making
Patent
1991-06-07
1993-08-31
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
29846, 29852, 228121, 2281221, 427 97, H05K 334
Patent
active
052397467
ABSTRACT:
The use of a conductive reactive braze material, loaded in via holes of a diamond substrate and heated in a suitable temperature range, results in conductive vias with excellent adherence to the via hole in the diamond material. Cracking of the diamond substrate, and loose or lost via elements, are minimized. A form of the disclosure is directed to a method for producing a circuit board having a multiplicity of conductive vias. A generally planar diamond substrate is provided. A multiplicity of via holes are formed through the substrate. The holes are loaded with a conductive reactive braze material. The braze material and the substrate are heated to a temperature which causes the braze material to melt and to react with the inner surface of the via holes and bond thereto. In an illustrated embodiment, the braze material comprises a conductive matrix component that includes at least one element selected from the group consisting of copper, silver, and gold, and a reactive component that includes at least one element selected from the group consisting of titanium, chromium, vanadium, zirconium, and hafnium. Another form of the disclosure is directed to a circuit board in which conductive vias pass through a diamond substrate and form a compound with the substrate at the inner surface of the via holes to bond to said inner surface of the via holes.
REFERENCES:
patent: 4131516 (1978-12-01), Bakos et al.
patent: 4313262 (1982-02-01), Barnes
patent: 5133120 (1992-07-01), Kawakami et al.
Arbes Carl J.
Norton Company
Novack Martin M.
Ulbrich Volker R.
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