Patent US4744943A successfully refreshed from Google Patents.
US4744943A
Expired / Lapsed
US
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Process for the densification of material preforms
Assignee: Dow Chemical Co
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Filing: 1986-12-08
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Granted: 1988-05-17
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Expires: 2006-12-08
Abstract
Abstract A process for preparing dense, consolidated bodies, the process comprising compressing in a forging press an isostatic die assembly, the assembly comprising a preform surrounded by a fluid pressure-transmitting medium, the medium and the preform being contained in a shell having an open top; under sufficient conditions of temperature, time and pressure that a dense, consolidated body of desired shape is formed, and then recovering the body by separating the body from the fluid pressure-transmitting medium.
Inventors
- 👤 Edward E. Timm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:20
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/04; B; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/15; B22F3/156; B22F3/1208; B22F3/1216; B30; B30B; B30B11/00; B30B11/001; C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/6455; B22F2998/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
80 words
A process for preparing dense, consolidated bodies of predetermined density, the process comprising compressing in a forging press an isostatic die assembly, the assembly comprising a preform surrounded by a fluid pressure-transmitting medium, the medium and the preform being contained in a ceramic-containing shell having an open top; under sufficient conditions of temperature, time and pressure that a dense, consolidated body of desired shape is formed, and then recovering the body by separating the body from the fluid pressure-transmitting medium.
Claim 2
Dependent Claim
80 words
A process for preparing dense, consolidated bodies of predetermined density, the process comprising compressing in a forging press an isostatic die assembly, the assembly comprising a preform surrounded by a fluid pressure-transmitting medium, the medium and the preform being contained in a ceramic-containing shell having an open top; under sufficient conditions of temperature, time and pressure that a dense, consolidated body of desired shape is formed, and then recovering the body by separating the body from the fluid pressure-transmitting medium.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the fluid medium comprises a glass, metal, salt, oil, grease or mixture thereof.
Claim 4
Dependent Claim
15 words
The process of claim 2 wherein at least a portion of the medium is recycled.
Claim 5
Dependent Claim
18 words
The process of claim 3 wherein at least a portion of the medium is recycled as a liquid.
Claim 6
Dependent Claim
19 words
The process of claim 3 wherein the fluid medium is collected and passes through a brittle phase during recycle.
Claim 7
Dependent Claim
23 words
The process of claim 2 wherein the medium is glass having a melting point of from about 500° C. to about 2,500° C.
Claim 8
Dependent Claim
19 words
The process of claim 2 wherein the bodies consist essentially of metal, plastic or ceramic materials, or mixtures thereof.
Claim 9
Dependent Claim
10 words
The process of claim 7 wherein the bodies are metal.
Claim 10
Dependent Claim
10 words
The process of claim 7 wherein the bodies are ceramic.
Claim 11
Dependent Claim
20 words
The process of claim 2 wherein the bodies comprise at least one of zirconia, silicon carbide, silicon nitride and alumina.
Claim 12
Dependent Claim
90 words
The process of claim 1 wherein the shell is a composite shell comprising: (A) a rigid interconnected skeleton structure which is collapsible in response to a predetermined force, and (B) a fluidizing means capable of fluidity and supported by and retained within said skeleton structure for forming a composite of skeleton structure fragments dispersed in said fluidizing means in response to the collapse of said skeleton structure at said predetermined force and for rendering said composite substantially fully dense and incompressible and capable of fluid flow at the consolidation conditions.
Claim 13
Dependent Claim
41 words
The process of claim 1 wherein the shell is a composite shell comprising: (A) a rigid interconnected skeleton structure which is collapsible in response to a predetermined force, and (B) a glass which is capable of plastic flow under consolidation conditions.
Claim 14
Dependent Claim
15 words
The process of claim 12 wherein the glass of the composite shell comprises borosilicate glass.
Claim 15
Dependent Claim
17 words
The process of claim 11 wherein the fluidizing means comprises a metal or a polymer or both.
Claim 16
Independent Claim
86 words
A method for the consolidation of powered materials, the method comprising: (a) placing a preform in a pressure-transmitting medium, the medium being contained in an open-topped ceramic-containing shell, to form a die assembly; (b) heating the die assembly to a temperature at which the pressure-transmitting medium is capable of fluidic flow; (c) in a forging press, compressing the die assembly to consolidate the preform under omnidirectional pressure into a dense, consolidated body of desired shape; and (d) separating the fluid pressure-transmitting medium from the consolidated body.
Claim 17
Independent Claim
86 words
A method for the consolidation of powered materials, the method comprising: (a) placing a preform in a pressure-transmitting medium, the medium being contained in an open-topped ceramic-containing shell, to form a die assembly; (b) heating the die assembly to a temperature at which the pressure-transmitting medium is capable of fluidic flow; (c) in a forging press, compressing the die assembly to consolidate the preform under omnidirectional pressure into a dense, consolidated body of desired shape; and (d) separating the fluid pressure-transmitting medium from the consolidated body.
Claim 18
Dependent Claim
37 words
The method of claim 15 wherein step (d) comprises inverting the die assembly over a filter in a manner such that the consolidated body is recovered on the filter and the fluid medium passes through the filter.
Claim 19
Dependent Claim
13 words
The method of claim 16 wherein the fluid medium is recovered and recycled.
Claim 20
Dependent Claim
14 words
The method of claim 17 wherein the fluid medium is recycled as a fluid.
Claim 21
Dependent Claim
11 words
The method of claim 18 wherein the fluid medium comprises glass.
Claim 22
Dependent Claim
66 words
In a process for the consolidation of metallic and nonmetallic powders and combinations thereof to form a brittle consolidated body of predetermined density, the process comprising subjecting a die assembly to pressure in a forging press, the die assembly comprising a shell and a fluid pressure-transmitting medium, the improvement comprising using an open-topped ceramic-containing shell and recovering the brittle consolidated body from the fluid pressure-transmitting medium.
Claim 23
Dependent Claim
66 words
In a process for the consolidation of metallic and nonmetallic powders and combinations thereof to form a brittle consolidated body of predetermined density, the process comprising subjecting a die assembly to pressure in a forging press, the die assembly comprising a shell and a fluid pressure-transmitting medium, the improvement comprising using an open-topped ceramic-containing shell and recovering the brittle consolidated body from the fluid pressure-transmitting medium.
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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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |