Patent US5134461A successfully refreshed from Google Patents.
US5134461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramics substrate with an improved surface structure for electronic components
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1990-12-06
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Granted: 1992-07-28
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Expires: 2010-12-06
Abstract
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.
Inventors
- 👤 Akira Yamakawa
- 👤 Akira Sasame
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:58
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/60; H10W70/62; H10W70/66; H05; H05K; H05K3/00; H05K3/22; H05K3/24; H05K3/245; H05K3/246; H10W70/01; H10W70/05; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12771; Y10T428/12861; Y10T428/12889; Y10T428/12944
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
51 words
A ceramics substrate having a surface, comprising a nickel layer on said surface, an NiAu alloy layer on said nickel layer, and an Au plating layer on said NiAu alloy layer, whereby said NiAu alloy layer protects said Au layer against tarnishing by suppressing diffusion of Ni into said Au layer.
Claim 2
Dependent Claim
51 words
A ceramics substrate having a surface, comprising a nickel layer on said surface, an NiAu alloy layer on said nickel layer, and an Au plating layer on said NiAu alloy layer, whereby said NiAu alloy layer protects said Au layer against tarnishing by suppressing diffusion of Ni into said Au layer.
Claim 3
Dependent Claim
18 words
The ceramics substrate according to claim 1, further comprising a metallized layer formed under said NiAu alloy layer.
Claim 4
Dependent Claim
21 words
The ceramics substrate according to claim 1, wherein a thickness of said Au plating layer is 1.0 μm at the most.
Claim 5
Dependent Claim
25 words
The ceramics substrate according to claim 1, wherein a thickness of said Au plating layer is in the range of 0.2 μm to 1.0 μm.
Claim 6
Dependent Claim
51 words
A ceramics substrate having a surface structure, comprising an AlN substrate, a metallized layer of a refractory metal formed on said AlN substrate, an Ni layer formed on said metallized layer, an NiAu alloy layer formed on said Ni layer, and an Au plating layer formed on said NiAu alloy layer.
Claim 7
Dependent Claim
51 words
A ceramics substrate having a surface structure, comprising an AlN substrate, a metallized layer of a refractory metal formed on said AlN substrate, an Ni layer formed on said metallized layer, an NiAu alloy layer formed on said Ni layer, and an Au plating layer formed on said NiAu alloy layer.
Claim 8
Dependent Claim
25 words
The ceramics substrate according to claim 5, wherein a thickness of said Au plating layer is in the range of 0.2 μm to 1.0 μm.
Claim 9
Dependent Claim
16 words
The ceramics substrate according to claim 5, wherein said refractory metal is W, Mo or Ta.
Claim 10
Dependent Claim
60 words
A ceramics substrate having a surface, comprising a nickel layer on said surface, an NiAu alloy layer on said nickel layer, and an Au plating layer having a thickness of 1.0 μm at the most on said NiAu alloy layer, whereby said NiAu alloy layer protects said Au layer against tarnishing by suppressing diffusion of Ni into said Au layer.
Claim 11
Dependent Claim
60 words
A ceramics substrate having a surface, comprising a nickel layer on said surface, an NiAu alloy layer on said nickel layer, and an Au plating layer having a thickness of 1.0 μm at the most on said NiAu alloy layer, whereby said NiAu alloy layer protects said Au layer against tarnishing by suppressing diffusion of Ni into said Au layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-28 | 1996-01-27 | 1996-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-28 | 2000-01-27 | 2000-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-28 | 2004-01-27 | 2004-07-28 | $7700.00 | Window Closed / Lapsed |