US3704508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for compacting metallic powders
Assignee: VINCENT N DI GIAMBATTISTA
•
Filing: 1971-02-24
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Granted: 1972-12-05
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Expires: 1991-02-24
Abstract
Abstract Metallic powders or mixtures of metallic powders together with a dilute solution of boric acid in methanol are consolidated at substantially atmospheric pressure and a temperature below the solidus point of the metallic powder to form consolidated articles having a theoretical density of 99% or greater. By employing different metallic powders, alloys can also be obtained.
Inventors
- 👤 Vincent N Di Giambattista
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:10
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/0433; B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
13 words
A process as claimed in claim 1 wherein said metallic powder is beryllium.
Claim 2
Dependent Claim
19 words
A process as claimed in claim 1 wherein said metallic powder comprises a mixture of more than one metal.
Claim 3
Dependent Claim
50 words
A process as claimed in claim 3 wherein said metallic powder comprises more than 50 percent of a metal selected from the group consisting of nickel, chromium and cobalt and less than 50 percent of a metal selected from the group consisting of zirconium, titanium, tungsten, molybdenum and mixtures thereof.
Claim 4
Dependent Claim
36 words
A process as claimed in claim 1 wherein said step of heating to a temperature below the solidus comprises heating the mixture to a temperature about 100*-200* F. below the melting point of the metallic powder.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 1 wherein said step of heating to below the solidus is continued for about 4 to 10 hours.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 1 wherein said metallic powder has a particle size of up to about 140 mesh.
Claim 7
Dependent Claim
20 words
A process as claimed in claim 7 wherein said metallic powder has a particle size less than about one-half micron.
Claim 8
Dependent Claim
29 words
A process as claimed in claim 1 wherein said mixture is heated to drive off said condensible vapors and entrained gases at a temperature up to about 1100* F.
Claim 9
Dependent Claim
15 words
A process as claimed in claim 1 wherein said container is a borosilicate glass container.
Claim 10
Dependent Claim
18 words
A process as claimed in claim 1 wherein said container has the shape of the desired unitary article.
Claim 11
Dependent Claim
68 words
A process as claimed in claim 1 wherein said step of heating to drive off said condensible vapors and entrained gases is accomplished by heating said mixture in a first container at a temperature and for a time sufficient to drive off said condensible vapors and heating the resulting mixture in a second container at a temperature and for a time sufficient to drive off said entrained gases.
Claim 12
Dependent Claim
37 words
A process as claimed in claim 12 wherein said mixture is heated in said first container at a temperature up to about 800* F. and in said second container at a temperature up to about 1100* F.
Claim 13
Dependent Claim
16 words
A process as claimed in claim 12 wherein said second container is a borosilicate glass container.
Claim 14
Dependent Claim
19 words
A process as claimed in claim 12 wherein said second container has the shape of the desired unitary article.
Claim 15
Dependent Claim
21 words
A process as claimed in claim 12 including the step of vibrating said mixture prior to heating in said second container.
Claim 16
Dependent Claim
20 words
A process as claimed in claim 16 wherein said container is vibrated to a tap density of about 65-68 percent.
Claim 17
Dependent Claim
21 words
A process as claimed in claim 1 wherein said container is sealed prior to heating to a temperature below the solidus.
Claim 18
Dependent Claim
28 words
A process as Claimed in claim 1 wherein said dilute solution includes about 0.015-0.1 percent by weight of boric acid based on the weight of said metallic powder.
Claim 19
Dependent Claim
22 words
A process as claimed in claim 19 wherein said dilute solution comprises about 0.5-3 percent by weight of boric acid in methanol.
Claim 20
Dependent Claim
22 words
A process as claimed in claim 1 including the further step of forging said unitary article after removal thereof from said container.
Claim 21
Dependent Claim
36 words
A process as claimed in claim 21 wherein said forging comprises heating said article to a temperature below the solidus point of said powder and reducing the volume of said article up to about 20 percent.
Claim 22
Dependent Claim
42 words
A process as claimed in claim 1 wherein said metallic powder has a particle size of up to about 140 mesh, and said dilute solution includes about 0.015-1 percent by weight of boric acid based on the weight of said metallic powder.
Claim 23
Dependent Claim
42 words
A process as claimed in claim 23 including the further step of forging said unitary article by heating said article to a temperature below the solidus point of said powder and reducing the volume of said article up to about 20 percent.
Claim 24
Dependent Claim
46 words
A process as claimed in claim 24 wherein said mixture is heated to drive off said condensible vapors and entrained gases at a temperature up to about 1100* F. and said heating to a temperature below the solidus is continued for about 4 to 10 hours.
Claim 25
Dependent Claim
29 words
A process as claimed in claim 25 wherein said dilute solution comprises about 0.5-3 percent by weight of boric acid in methanol and said container is a borosilicate container.
Claim 26
Dependent Claim
9 words
A product made by the process of claim 1.
References Cited (Backward Citations)
CA553284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |