Patent US4386959A successfully refreshed from Google Patents.
US4386959A
Expired / Lapsed
US
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Method for compound sintering
Assignee: Thyssen Stahl AG
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Filing: 1980-06-30
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Granted: 1983-06-07
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Expires: 2000-06-30
Abstract
Abstract Joined connections between a metallic compact body made by melting metallurgy and a body made by powder metallurgy are prepared by providing a pre-formed, unsintered pressed body having at least one component which forms a liquid phase at the sintering temperature, placing the pre-formed body directly in contact with a metallic compact body without application of external pressure and subjecting the contacted bodies to a temperature sufficient to sinter the pressed body but below the liquidus temperature of the compact body.
Inventors
- 👤 Fritz Frehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:56
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B22F7/062; B22F5/00; B22F2005/001; B22F2998/00; B22F2999/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
A method for forming a joined connection between a sintered pressed body made by powder metallurgy and a metallic compact body, said method consisting essentially of: (a) providing an unsintered pre-formed pressed body made from a mixture of powdered metallurgical components, at least one of said components forming a liquid phase at the sintering temperature of the pressed body; (b) placing a surface of said pressed body directly in contact with a surface of a metallic compact body, made by melting metallurgy, without applying external pressure; and (c) subjecting the contacted pressed body and compact body, in a vacuum or a protective gas atmosphere, without application of external pressure, to a temperature below the liquidus temperature of the compact body but sufficient to sinter said pressed body, thereby firmly joining together the compact body and the sintered pressed body.
Claim 2
Independent Claim
139 words
A method for forming a joined connection between a sintered pressed body made by powder metallurgy and a metallic compact body, said method consisting essentially of: (a) providing an unsintered pre-formed pressed body made from a mixture of powdered metallurgical components, at least one of said components forming a liquid phase at the sintering temperature of the pressed body; (b) placing a surface of said pressed body directly in contact with a surface of a metallic compact body, made by melting metallurgy, without applying external pressure; and (c) subjecting the contacted pressed body and compact body, in a vacuum or a protective gas atmosphere, without application of external pressure, to a temperature below the liquidus temperature of the compact body but sufficient to sinter said pressed body, thereby firmly joining together the compact body and the sintered pressed body.
Claim 3
Dependent Claim
16 words
The method according to claim 1 wherein said pressed body is a steel bonded hard material.
Claim 4
Dependent Claim
14 words
The method according to claim 2 wherein said hard material is a metal carbide.
Claim 5
Dependent Claim
13 words
The method according to claim 3 wherein said metal carbide is titanium carbide.
References Cited (Backward Citations)
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US3795511A
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US3717442A
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US3744120A
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US3889349A
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US4029476A
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US4289833A
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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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |