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US4025313A
Expired / Lapsed
US
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Rolled stock of powder metallurgically-formed, nonductile material and method of production
Assignee: Texas Instruments Inc
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Filing: 1974-07-24
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Granted: 1977-05-24
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Expires: 1994-07-24
Abstract
Abstract Rolled stock of a relatively nonductile material and a powder metallurgical method for its production. A precompact is formed including a body of powder of said nonductile material with generally parallel borders of a ductile metal powder compatible with the nonductile material along two side edges thereof. The precompact is compressed to form a compact of said nonductile metal with borders of said ductile metal and having two generally parallel faces extending between the outside edges thereof. The compact is sintered to form a bordered ingot which is then rolled in a direction parallel to its borders by applying rolling force to its faces. Initiation of edge cracks during the rolling operation is thereby inhibited.
Inventors
- 👤 Hendrick J. Slaats
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:00
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B22F3/00; B22F3/18; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12229; Y10T428/12271; Y10T428/12278
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
A powder metallurgical method for producing rolled stock of a relatively nonductile metal material which is free of edge cracks, said method comprising the steps of: forming a precompact comprising a first body of powder of said nonductile metal material and two generally parallel bodies of powder of a ductile metal compatible with said nonductile material which extend along respective side edges of said first body of powder; compressing said precompact to form a compact of said nonductile material having borders of said ductile metal extending along the side edges thereof and having two generally parallel faces extending between said side edges thereof; sintering said compact to form a bordered ingot; rolling the bordered ingot in a direction parallel to said borders by applying rolling force to said generally parallel faces whereby the thickness of said ingot is reduced while formation of edge cracks in said nonductile material is inhibited during said rolling; and trimming said borders from said ingot to form said rolled stock.
Claim 2
Dependent Claim
165 words
A powder metallurgical method for producing rolled stock of a relatively nonductile metal material which is free of edge cracks, said method comprising the steps of: forming a precompact comprising a first body of powder of said nonductile metal material and two generally parallel bodies of powder of a ductile metal compatible with said nonductile material which extend along respective side edges of said first body of powder; compressing said precompact to form a compact of said nonductile material having borders of said ductile metal extending along the side edges thereof and having two generally parallel faces extending between said side edges thereof; sintering said compact to form a bordered ingot; rolling the bordered ingot in a direction parallel to said borders by applying rolling force to said generally parallel faces whereby the thickness of said ingot is reduced while formation of edge cracks in said nonductile material is inhibited during said rolling; and trimming said borders from said ingot to form said rolled stock.
Claim 3
Dependent Claim
79 words
A method as set forth in claim 1 wherein the precompact is formed to include a continuous layer of said ductile metal powder extending between the aforesaid two bodies of ductile metal powder along a third side of the body of nonductile material powder and whereby said precompact is compressed to form said compact with said ductile metal borders and with a layer of said ductile metal powder extending along one of said generally parallel faces of said compact.
Claim 4
Dependent Claim
42 words
A method as set forth in claim 1 wherein said precompact is formed by charging said nonductile material powder and said ductile metal powder into a mold, and the precompact in the mold is compressed by a die to form said compact.
Claim 5
Dependent Claim
34 words
A method as set forth in claim 3 wherein thin partitions are positioned in the mold to define separate compartments to which the nonductile material powder and the ductile metal powder are respectively charged.
Claim 6
Dependent Claim
20 words
A method as set forth in claim 1 wherein the bordered ingot is annealed after rolling to increase its ductility.
Claim 7
Dependent Claim
44 words
A method as set forth in claim 1 wherein the bordered ingot is annealed after its thickness has been reduced by no more than about 25% and rolling is resumed after said annealing to effect further reduction in the thickness of the bordered ingot.
Claim 8
Dependent Claim
27 words
A method as set forth in claim 1 wherein sid nonductile material comprises a silver/cadmium oxide powder and said ductile metal comprises a fine silver metal powder.
Claim 9
Dependent Claim
148 words
Rolled stock prepared by a method comprising the steps of: forming a precompact comprising a first body of powder of nonductile metal material and two generally parallel bodies of powder of a ductile metal compatible with said nonductile material which extend along respective side edges of the first body of powder; compressing said precompact to form a compact of said nonductile material having borders of said ductile metal extending along the side edges thereof and having two generally parallel faces extending between said side edges thereof; sintering said compact to form a bordered ingot; rolling the bordered ingot in a direction parallel to said borders by applying rolling force to said generally parallel faces whereby the thickness of said ingot is reduced while formation of edge cracks in said nonductile material is inhibited during said rolling; and trimming said borders from said ingot to form said rolled stock.
Claim 10
Dependent Claim
148 words
Rolled stock prepared by a method comprising the steps of: forming a precompact comprising a first body of powder of nonductile metal material and two generally parallel bodies of powder of a ductile metal compatible with said nonductile material which extend along respective side edges of the first body of powder; compressing said precompact to form a compact of said nonductile material having borders of said ductile metal extending along the side edges thereof and having two generally parallel faces extending between said side edges thereof; sintering said compact to form a bordered ingot; rolling the bordered ingot in a direction parallel to said borders by applying rolling force to said generally parallel faces whereby the thickness of said ingot is reduced while formation of edge cracks in said nonductile material is inhibited during said rolling; and trimming said borders from said ingot to form said rolled stock.
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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |