Patent US3525743A successfully refreshed from Google Patents.
US4903885A
Expired / Lapsed
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Method and apparatus for fastening electronic components to substrates
Assignee: Siemens AG
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Filing: 1989-03-01
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Granted: 1990-02-27
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Expires: 2009-03-01
Abstract
Abstract A pressure sintering method and apparatus provides that surfaces to be joined are pressed together with a pressure of at least 900 N/cm 2 at a sintering temperature upon the interposition of a metal powder paste which serves to fasten electronic components, such as power semiconductors, to substrates. Components having a structured upper side can be pressure sintered when they are inserted into a receptacle chamber closed by a movable die together with a member of elastically deformable material, such as silicone rubber, which transmits the sintering pressure. The deformable member completely fills out the remaining space of the receptacle chamber when the sintering pressure reached.
Inventors
- 👤 Herbert Schwarzbauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:22
CPC Classifications
H; H10; H10W; H10W99/00; H10P; H10P72/00; H10P72/70; H10P72/74; H10P72/7416; H10W72/00; H10W72/071; H10W72/0711; H10W72/07141; H10W72/073; H10W72/07331; H10W72/07336; H10W72/30; H10W72/321; H10W72/325; H10W72/351; H10W72/352
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
202 words
A method for fastening an electronic component to a substrate by pressure sintering, comprising the steps of: applying a paste of a metal powder and of a solvent to a boundary surface having a contact layer to be fastened between the component and the substrate; completely drying said paste applied at the boundary surface; placing the component in place on the substrate; placing the component and the substrate into a receptacle composed of a floor part and of a lateral wall part that is augmented by a die which is movable in a direction toward said floor part to form a closed receptacle chamber, said floor part being supported against a first press ram and said die being supported against a second press ram; placing a deformable member of temperature resistant elastically deformable material into said receptacle; pressing together said first and second pressing rams at a sintering temperature and at a pressure of at least 900 N/cm 2 , said deformable member having a volume which completely fills an interior of the receptacle chamber not occupied by the component and the substrate when said pressure is reached so that direct contact between said die and the component and substrate is avoided.
Claim 2
Independent Claim
202 words
A method for fastening an electronic component to a substrate by pressure sintering, comprising the steps of: applying a paste of a metal powder and of a solvent to a boundary surface having a contact layer to be fastened between the component and the substrate; completely drying said paste applied at the boundary surface; placing the component in place on the substrate; placing the component and the substrate into a receptacle composed of a floor part and of a lateral wall part that is augmented by a die which is movable in a direction toward said floor part to form a closed receptacle chamber, said floor part being supported against a first press ram and said die being supported against a second press ram; placing a deformable member of temperature resistant elastically deformable material into said receptacle; pressing together said first and second pressing rams at a sintering temperature and at a pressure of at least 900 N/cm 2 , said deformable member having a volume which completely fills an interior of the receptacle chamber not occupied by the component and the substrate when said pressure is reached so that direct contact between said die and the component and substrate is avoided.
Claim 3
Dependent Claim
16 words
A method as claimed in claim 1, wherein said electronic component is a large-area power semiconductor.
Claim 4
Dependent Claim
15 words
A method as claimed in claim 1, wherein said paste is applied on the component.
Claim 5
Dependent Claim
15 words
A method as claimed in claim 1, wherein said paste is applied on the substrate.
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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |