Patent US4081272A successfully refreshed from Google Patents.
US4081272A
Expired / Lapsed
US
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Method for hot isostatic pressing powder bodies
Assignee: ABB Norden Holding AB
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Filing: 1976-02-03
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Granted: 1978-03-28
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Expires: 1996-02-03
Abstract
Abstract In manufacturing objects by isostatic pressing of a preformed powder body enclosed in a deformable casing at elevated temperatures and pressures, the body of powder is preformed and is then arranged in a glass capsule of a first material which is embedded in a glass powder having a higher softening temperature than the first material. The capsule with the embedded body is evacuated and sealed, and the capsule with its contents is heated and subjected to isostatic pressure.
Inventors
- 👤 Jan Adlerborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:32
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/593; B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; B22F3/1216; B22F3/14; B22F3/15
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
Method for manufacturing objects by isostatic pressing of a preformed powder body enclosed in a deformable casing at such an elevated temperature and such a pressure that the powder grains are bonded and the body is compressed to a density near the theoretically possible density, which comprises: (a) preforming a body of powder; (b) arranging the body in a glass capsule of a first material and embedding the body in a glass powder of a second material with a higher softening temperature than the first material; (c) evecuating and sealing the capsule with the embedded body; (d) heating the capsule with its contents to at least the softening temperature of the first material and subjecting it in a pressure furnace to an isostatic pressure from a pressure medium.
Claim 2
Dependent Claim
128 words
Method for manufacturing objects by isostatic pressing of a preformed powder body enclosed in a deformable casing at such an elevated temperature and such a pressure that the powder grains are bonded and the body is compressed to a density near the theoretically possible density, which comprises: (a) preforming a body of powder; (b) arranging the body in a glass capsule of a first material and embedding the body in a glass powder of a second material with a higher softening temperature than the first material; (c) evecuating and sealing the capsule with the embedded body; (d) heating the capsule with its contents to at least the softening temperature of the first material and subjecting it in a pressure furnace to an isostatic pressure from a pressure medium.
Claim 3
Dependent Claim
31 words
A method according to claim 1, in which the capsule is formed of a glass with a relatively low softening temperature, and the glass powder has a high silicic acid content.
Claim 4
Dependent Claim
23 words
A method according to claim 1 in which the body is of silicon nitride and is pressed at a temperature exceeding 1600° C.
Claim 5
Dependent Claim
14 words
A method according to claim 3, in which the compacting pressure exceeds 50 MPa.
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) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |