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US4568586A
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Ceramic/metal element
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1984-08-15
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Granted: 1986-02-04
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Expires: 2004-08-15
Abstract
Abstract A ceramic/metal element, in which a metal layer (1) is firmly bonded to a ceramic substrate (2) after cooling and consequent solidification of a previously liquid eutectic interlayer (3), wherein the metal layer (1) has at least approximately the same or a greater thickness (D) than the ceramic substrate (2) and is composed in the manner of a mosaic from individual, predominantly loosely adjoining metal elements (1). By using the composite structure of the present ceramic/metal element, fracture of the ceramic substrate and curvature of the composite ceramic/metal element is avoided.
Inventors
- 👤 Jens Gobrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:13
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/0271; H10; H10W; H10W40/00; H10W40/20; H10W40/25; H10W40/257; H10W40/259; H10W70/00; H10W70/60; H10W70/67; H10W70/68; H10W70/6875; H10W70/69; H10W70/692; H05K1/03; H05K1/0306; H05K2201/00; H05K2201/09; H05K2201/09009; H05K2201/09036; H05K3/00; H05K3/0058; H05K3/0061; Y; Y10; Y10S; Y10S228/00; Y10S228/903; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T428/00; Y10T428/16; Y10T428/163; Y10T428/164; Y10T428/166
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
66 words
A ceramic/metal element, in which a metal layer (1) is firmly bonded to a ceramic substrate (2) after cooling and consequent solidification of a previously liquid eutetic interlayer (3), wherein the metal layer (1) has at least approximately the same or a greater thickness(D) than the ceramic substrate (2) and is composed in the manner of a mosaic from individual, predominantly loosely adjoining metal elements (1.1).
Claim 2
Dependent Claim
66 words
A ceramic/metal element, in which a metal layer (1) is firmly bonded to a ceramic substrate (2) after cooling and consequent solidification of a previously liquid eutetic interlayer (3), wherein the metal layer (1) has at least approximately the same or a greater thickness(D) than the ceramic substrate (2) and is composed in the manner of a mosaic from individual, predominantly loosely adjoining metal elements (1.1).
Claim 3
Dependent Claim
27 words
The ceramic/metal element according to claim 1 wherein the metal is Cu or Al and the ceramic is Al 2 O 3 , BeO, AlN or SiC.
Claim 4
Dependent Claim
14 words
The ceramic/metal element according to claim 1, wherein the metal elements (1.1) are cuboid.
Claim 5
Dependent Claim
15 words
The ceramic/metal element according to claim 1, wherein the metal elements (1.1) are hexagonal rods.
Claim 6
Dependent Claim
28 words
The ceramic/metal element according to claim 1, wherein the interlayer (3) is a metal oxide layer of a metal which is identical to the metal of layer (1).
Claim 7
Dependent Claim
16 words
The ceramic/metal element according to claim 5, wherein the metal oxide of the interlayer is CuO.
Claim 8
Dependent Claim
45 words
The ceramic/metal element according to claim 1, wherein the greatest linear dimension (1) of the metal elements (1.1) in the layer plane of the metal layer (1) is smaller, or at least not substantially greater, than twice the thickness (D), of the metal layer (1).
Claim 9
Dependent Claim
38 words
The ceramic/metal element according to claim 7, wherein the greatest linear dimension (1) of the metal elements (1.1) in the layer plane of the metal layer (1) is equal to the single thickness (D) of the metal layer.
Claim 10
Dependent Claim
38 words
The ceramic/metal element according to claim 1, wherein the metal elements (1.1) are provided, on their mutual contact faces, with a coating (1.2) which does not form a eutectic at temperatures below the melting point of the metal.
Claim 11
Dependent Claim
20 words
The ceramic/metal element according to claim 9, wherein the Ni, Pd, Pt or Cr is used as the coating (1.2).
Claim 12
Dependent Claim
25 words
The ceramic/metal element according to claim 9, wherein the coating (1.2) is applied to the metal elements (1.1) by electroplating or by an electroless process.
Claim 13
Dependent Claim
32 words
The ceramic/metal element according to claim 1, wherein the ceramic substrate (2), on its side facing away from the first metal layer (1), is provided with conductor tracks (4.1, 4.2 and 4.3).
Claim 14
Dependent Claim
34 words
The ceramic/metal element according to claim 12, wherein an active semiconductor element (5) or a plug connector (6) or both is fitted to at least one of the conductor tracks (4.1, 4.2, and 4.3).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |