Ceramics substrate with an improved surface structure for electr

Details Ceramics substrate with an improved surface structure for electr Ceramics substrate with an improved surface structure for electr

1990-12-06

1992-07-28

Hille, Rolf

Stock material or miscellaneous articles

Composite

Of bituminous or tarry residue

357 80, 357 67, 428680, H01L 2314

Patent

active

051344610

ABSTRACT:
A ceramic substrate has a surface structure capable of suppressing diffusion of Ni into an Au plating layer by providing an NiAu alloy layer between the substrate and the Au plating layer, whereby the thickness of the Au plating layer may be reduced. Such a surface structure is formed by applying the following layers to the substrate, a metallized layer (12), Ni an layer (13) and Au layer (14) in this order. The substrate (11) is heated in a non-oxidizing atmosphere to cause an alloying reaction between the Ni layer (13) and the Au layer (14). Thereafter, an Au plating layer (16) is formed on the NiAu alloy layer (15). Since Ni in the NiAu alloy layer is not easily released, diffusion of Ni into the Au plating layer is suppressed sufficiently.

REFERENCES:
patent: 3242391 (1966-03-01), Gorman
patent: 4910094 (1990-03-01), Watanabe et al.
patent: 5023407 (1991-06-01), Shirai et al.

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