US4478626A
Expired / Lapsed
US
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Method of hot isostatic pressing treatment
Assignee: Kobe Steel Ltd
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Filing: 1982-09-01
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Granted: 1984-10-23
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Expires: 2002-09-01
Abstract
Abstract A method of hot isostatic pressing in which a shaped work immersed in molten glass is subjected to a hot isostatic pressing treatment, the method basically including embedding a shaped item to be worked on in glass powder filled in a crucible; loading the crucible into a movable heating furnace having a heater and a heat insulating structure; charging the furnace into an atmospheric chamber; adjusting the atmosphere in the chamber into a predetermined condition and heating the crucible by the heater to soften and melt the glass in the crucible; transferring the furnace from the atmospheric chamber into a high pressure container while maintaining a high temperature in the furnace; admitting a pressing gas medium into the high pressure container while raising the temperature of the furnace to let the work in the crucible undergo a hot isostatic pressing treatment; and upon completion of the hot isostatic pressing treatment, taking out the furnace from the high pressure container with the work still in loaded state in the heating furnace. In an alternate embodiment of the invention, a plurality of heating furnaces are provided. and more than one atmospheric chamber for a single high pressure container to realize efficient HIP operation with a markedly shortened cycle time.
Inventors
- 👤 Masato Moritoki
- 👤 Takao Fujikawa
- 👤 Junichi Miyanaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:32
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/15; B28; B28B; B28B3/00; B28B3/006; B30; B30B; B30B11/00; B30B11/001; B30B11/002; C; C04; C04B; C04B2235/00; C04B2235/65; C04B2235/658; C04B2235/6587
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
174 words
A method of hot isostatic pressing in which a shaped item to be worked immersed in molten glass in subjected to a hot isostatic pressing treatment, said method comprising: embedding said shaped item to be worked in glass powder disposed in a crucible; loading said crucible into a movable heating furnace having a heater and a heat insulating structure; charging said furnace into an atmospheric chamber; adjusting the atmosphere in said chamber to a predetermined condition and heating said crucible by said heater to soften and melt said glass in said crucible; transferring said furnace from said atmospheric chamber into a high pressure container while maintaining a high temperature in said furnace; admitting a pressurizing gas medium into said high pressure container while raising the temperature of said furnace such that said item to be worked on in said crucible undergoes a hot isostatic pressing treatment; and upon completion of said hot isostatic treatment, removing said furnace from said high pressure container with said item to be worked being maintained in a loaded state.
Claim 2
Independent Claim
174 words
A method of hot isostatic pressing in which a shaped item to be worked immersed in molten glass in subjected to a hot isostatic pressing treatment, said method comprising: embedding said shaped item to be worked in glass powder disposed in a crucible; loading said crucible into a movable heating furnace having a heater and a heat insulating structure; charging said furnace into an atmospheric chamber; adjusting the atmosphere in said chamber to a predetermined condition and heating said crucible by said heater to soften and melt said glass in said crucible; transferring said furnace from said atmospheric chamber into a high pressure container while maintaining a high temperature in said furnace; admitting a pressurizing gas medium into said high pressure container while raising the temperature of said furnace such that said item to be worked on in said crucible undergoes a hot isostatic pressing treatment; and upon completion of said hot isostatic treatment, removing said furnace from said high pressure container with said item to be worked being maintained in a loaded state.
Claim 3
Dependent Claim
27 words
A method of hot isostatic pressing as set forth in claim 1, wherein said shaped item to be worked further comprises a green compact of ceramic powder.
Claim 4
Dependent Claim
25 words
A method of hot isostatic pressing as set forth in claim 1, wherein said crucible is of graphite and has an upwardly diverging inner shape.
Claim 5
Independent Claim
44 words
A method of hot isostatic pressing as set forth is claims 1, 2 or 3, which further comprises applying a parting agent to the surfaces of said item to be worked on prior to loading into said crucible for preventing adhesion of molten glass.
Claim 6
Independent Claim
36 words
A method of hot isostatic pressing as set forth in claims 1, 2 or 3, which further comprises coating said crucible with a parting agent on the inner surfaces thereof to prevent adhesion of molten glass.
Claim 7
Dependent Claim
20 words
A method of hot isostatic pressing as set forth in claim 4, wherein said parting agent comprises boron nitride powder.
Claim 8
Independent Claim
27 words
A method of hot isostatic pressing as set forth in claims 1, 2 or 3, which further comprises loading a plurality of crucibles into said heating furnace.
Claim 9
Independent Claim
244 words
A method of hot isostatic pressing in which a shaped item to be worked immersed in molten glass is subjected to a hot isostatic pressing treatment, the method including a repeated cycle of operation which comprises the steps of: providing a plurality of movable heating furnaces each having a heater and a heat insulating structure, more than one atmospheric chamber, and a high pressure container; embedding said item to be worked in glass powder disposed in a crucible; loading the crucible into a first furnace; charging said first furnace into an atmospheric chamber and adjusting the atmosphere of said chamber to a predetermined condition while heating said crucible in said furnace by said heater to soften and melt said glass in said crucible; transferring said first furnace from said atmospheric chamber to said high pressure container while maintaining said furnace at a high temperature; introducing a pressing gas medium into said high pressure container while raising the furnace temperature such that said item to be worked on in said crucible undergoes a hot isostatic pressing treatment; sending a second heating furnace into said atmospheric chamber having a second item to be worked on similarly embedded in glass powder in a crucible to soften and melt the glass powder while conducting said hot isostatic pressing treatment; taking out said first heating furnace from said high pressure container upon completion of said hot isostatic treatment; and succeedingly charging said second furnace into said high pressure container.
Claim 10
Independent Claim
244 words
A method of hot isostatic pressing in which a shaped item to be worked immersed in molten glass is subjected to a hot isostatic pressing treatment, the method including a repeated cycle of operation which comprises the steps of: providing a plurality of movable heating furnaces each having a heater and a heat insulating structure, more than one atmospheric chamber, and a high pressure container; embedding said item to be worked in glass powder disposed in a crucible; loading the crucible into a first furnace; charging said first furnace into an atmospheric chamber and adjusting the atmosphere of said chamber to a predetermined condition while heating said crucible in said furnace by said heater to soften and melt said glass in said crucible; transferring said first furnace from said atmospheric chamber to said high pressure container while maintaining said furnace at a high temperature; introducing a pressing gas medium into said high pressure container while raising the furnace temperature such that said item to be worked on in said crucible undergoes a hot isostatic pressing treatment; sending a second heating furnace into said atmospheric chamber having a second item to be worked on similarly embedded in glass powder in a crucible to soften and melt the glass powder while conducting said hot isostatic pressing treatment; taking out said first heating furnace from said high pressure container upon completion of said hot isostatic treatment; and succeedingly charging said second furnace into said high pressure container.
Claim 11
Dependent Claim
26 words
A method of hot isostatic pressing as set forth in claim 8, wherein said shaped item to be worked on further comprises a molded ceramic material.
Claim 12
Independent Claim
27 words
A method of hot isostatic pressing as set forth in claims 8 or 9, wherein said crucible further comprises graphite and has an upwardly diverging inner shape.
Claim 13
Independent Claim
40 words
A method of hot isostatic pressing as set forth in claims 8 or 9, which further comprises applying a parting agent to said item to be worked on prior to loading into said crucible for preventing adhesion of molten glass.
Claim 14
Independent Claim
35 words
A method of hot isostatic pressing as set forth in claims 8 or 9, which further comprises coating said crucible with a parting agent on the inner surfaces thereof to prevent adhesion of molten glass.
Claim 15
Dependent Claim
21 words
A method of hot isostatic pressing as set forth in claim 11, wherein said parting agent further comprises boron nitride powder.
Claim 16
Independent Claim
34 words
A method of hot isostatic pressing as set forth in claims 8 or 9, which further comprises simultaneously loading a plurality of crucibles into a single heating furnace of said plurality of heating furnaces.
Claim 17
Dependent Claim
20 words
A method of hot isostatic pressing as set forth in claim 12, wherein said parting agent comprises boron nitride powder.
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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |