US3729971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hot compacting titanium powder
Assignee: Alcoa Corp
•
Filing: 1971-03-24
•
Granted: 1973-05-01
•
Expires: 1991-03-24
Abstract
Abstract Hot isostatic compacting of titanium or titanium-base alloy powder to a product having controlled interstitials and microstructure and possessing outstanding end properties, low porosity and high density and one which does not require subsequent forging.
Inventors
- 👤 T Gurganus
- 👤 G Turnbull
- 👤 A Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:47
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/15; Y; Y10; Y10S; Y10S29/00; Y10S29/031; Y10S29/045
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
36 words
The process of claim 1 wherein the interstitial content is controlled by maintaining the oxygen content of said titanium throughout the process at not exceeding the requirement of MIL-T-9047 on the filing date of this specification.
Claim 2
Dependent Claim
36 words
The process of claim 1 wherein the interstitial content is controlled by maintaining the nitrogen content of said titanium throughout the process at not exceeding the requirement of MIL-T-9047 on the filing date of this specification.
Claim 3
Dependent Claim
36 words
The process of claim 1 wherein the interstitial content is controlled by maintaining the hydrogen content of said titanium throughout the process at not exceEding the requirement of MIL-T-9047 on the filing date of this specification.
Claim 4
Dependent Claim
36 words
The process of claim 1 wherein the interstitial content is controlled by maintaining the carbon content of said titanium throughout the process at not exceeding the requirement of MIL-T-9047 on the filing date of this specification.
Claim 5
Dependent Claim
33 words
The process of claim 1 wherein the temperature at which the hot compacting takes place is between about 200* F below the beta transus temperature and the beta transus temperature of the titanium.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein the compacting pressure is from about 1,000 to about 25,000 psi.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the density of the shaped article exceeds about 97 percent of theoretical.
Claim 8
Dependent Claim
25 words
The process of claim 1 wherein the powder is compacted to at least about 60 percent theoretical density by cold compacting before said hot compacting.
Claim 9
Dependent Claim
18 words
The process of claim 9 wherein the cold compacting is followed by degassing prior to said hot compacting.
Claim 10
Dependent Claim
23 words
The process of claim 1 wherein the intermediate pressure transfer medium is selected from the group consisting of molten glass, sand and steel.
Claim 11
Dependent Claim
13 words
The process of claim 1 wherein the intermediate pressure transfer medium is solid.
Claim 12
Dependent Claim
13 words
The process of claim 1 wherein the intermediate pressure transfer medium is liquid.
Claim 13
Dependent Claim
62 words
The process of claim 1 wherein, prior to the hot compacting, the titanium powder is prepared by filling a flexible mold of substantially the shape of the resulting shaped article with titanium powder of a density of about 15-30 percent of theoretical and cold isostatically compacting said powder in such mold to a density of at least about 60 percent of theoretical.
Claim 14
Dependent Claim
18 words
The process of claim 14 wherein, prior to the hot compacting, the cold-compacted powder is degassed by heating.
References Cited (Backward Citations)
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US3284195A
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US3279917A
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US3475142A
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US3390985A
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US3681037A
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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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |