US4642218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot rolling of ceramics by the use of self propagating synthesis
Assignee: United States Department of the Navy
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Filing: 1984-10-19
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Granted: 1987-02-10
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Expires: 2004-10-19
Abstract
Abstract A method for producing high technology ceramics with minimal porosity comsing the steps of filling a can with a constituent powder of a ceramic, creating a vacuum in the can and maintaining the vacuum throughout the entire process; outgassing the powder in the can by placing a furnace around the area of the can that encloses the powder and heating the furnace to at least 100° C.; removing the furnace after a minimum of five minutes of heating; cold rolling the can in a rolling system; igniting the powder so a localized propagation reaction front is created; and hot rolling the can in the rolling system so the propagation reaction front is maintained between the rolls of the rolling system.
Inventors
- 👤 Roy W. Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:48
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/65; C04B35/651
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
66 words
A method for producing high technology ceramics with minimal porosity comprising the steps of: filling a can with constituent powders of a ceramic; igniting the powders at a localized point so a reaction front is created in the powder that propogates from the point; and applying localized pressure to the can such that the propagation reaction front in the ignited powder is subJected to the pressure.
Claim 2
Independent Claim
66 words
A method for producing high technology ceramics with minimal porosity comprising the steps of: filling a can with constituent powders of a ceramic; igniting the powders at a localized point so a reaction front is created in the powder that propogates from the point; and applying localized pressure to the can such that the propagation reaction front in the ignited powder is subJected to the pressure.
Claim 3
Dependent Claim
48 words
A method as described in claim 2 wherein the applying localized pressure step further includes applying localized pressure to the can by rolling the can through a rolling system such that the propagation reaction front in the ignited powder remains in between rolling pins of the rolling system.
Claim 4
Dependent Claim
38 words
A method as described in claim 2 which includes the additional step of rolling the can through the rolling system without the powder being ignited, said additional step occuring before the ignition step and after the filling step.
Claim 5
Dependent Claim
77 words
A method as described in claim 3 that further includes the steps of outgassing the powder in the can by placing a furnace around the area of the can that encloses the powder and heating the furnace to at least 100 0 C. and removing said furnace from around the can after at least five minutes of heating during said outgassing step: a said removing step occuring before the cold rolling step and after the filling step.
Claim 6
Dependent Claim
19 words
A method as described in claim 1 wherein a vacuum is maintained in the can described in claim 1.
Claim 7
Dependent Claim
22 words
A method as described in claim 4 wherein a vacuum is maintained in the can during the steps described in claim 4.
Claim 8
Dependent Claim
27 words
A method as described in claim 1 wherein during the filling step the powder that the can is filled with, is a mixture of Titanium and Boron.
Claim 9
Dependent Claim
27 words
A method as described in claim 6 wherein during the filling step the powder that the can is filled with, is a mixture of Titanium and Boron.
Claim 10
Dependent Claim
31 words
A method as described in claim 1 wherein during the filling step the powder that the can is filled with, is a mixture of Al+TiO 2 +B 2 O 3 .
Claim 11
Dependent Claim
31 words
A method as described in claim 6 wherein during the filling step the powder that the can is filled with, is a mixture of Al+TiO 2 +B 2 O 3 .
Claim 12
Dependent Claim
25 words
A method as described in claim 1 wherein during the filling step the powder that the can is filled with, is a mixture of Ti+B+C.
Claim 13
Dependent Claim
25 words
A method as described in claim 6 wherein during the filling step the powder that the can is filled with, is a mixture of Ti+B+C.
Claim 14
Dependent Claim
25 words
A method as described in claim 1 wherein during the filling step the powder that the can is filled with, is a mixture of Ti+C.
Claim 15
Dependent Claim
25 words
A method as described in claim 6 wherein during the filling step the powder that the can is filled with, is a mixture of Ti+C.
Claim 16
Dependent Claim
27 words
A method as described in claim 1 wherein during the filling step the powder that the can is filled with, is a mixture of Carbon and Boron.
Claim 17
Dependent Claim
27 words
A method as described in claim 6 wherein during the filling step the powder that the can is filled with, is a mixture of Carbon and Boron.
Claim 18
Dependent Claim
20 words
A method as described in claim 1 which includes the step of mixing the constituent powders before the filling step.
Claim 19
Independent Claim
143 words
A method for producing high technology ceramics with minimal porosity comprising the steps of: mixing constituent powders of a ceramic; filling a can with the constituent powders; outgassing the powder in the can by placing a furnace around the area of the can that encloses the powder and heating the furnace to at least 100° C.; removing said furnace from around the can after at least five minutes of heating during said outgassing step; applying localized pressure to the can by rolling the can through a rolling system; igniting the powders at a localized point so a reaction front is created in the powder that propagates from the point; and applying localized pressure to the can by rolling the can through the rolling system such that the propagation reaction front in the ignited powder remains in between rolling pins of the rolling system.
Claim 20
Independent Claim
143 words
A method for producing high technology ceramics with minimal porosity comprising the steps of: mixing constituent powders of a ceramic; filling a can with the constituent powders; outgassing the powder in the can by placing a furnace around the area of the can that encloses the powder and heating the furnace to at least 100° C.; removing said furnace from around the can after at least five minutes of heating during said outgassing step; applying localized pressure to the can by rolling the can through a rolling system; igniting the powders at a localized point so a reaction front is created in the powder that propagates from the point; and applying localized pressure to the can by rolling the can through the rolling system such that the propagation reaction front in the ignited powder remains in between rolling pins of the rolling system.
Claim 21
Dependent Claim
19 words
A method as described in claim 18 wherein a vacuum is maintained in the can described in claim 1.
Claim 22
Dependent Claim
27 words
A method as described in claim 18 wherein during the filling step the powder that the can is filled with, is a mixture of Titanium and Boron.
Claim 23
Dependent Claim
31 words
A method as described in claim 18 wherein during the filling step the powder that the can is filled with, is a mixture of Al+TiO 2 +B 2 O 3 .
Claim 24
Dependent Claim
25 words
A method as described in claim 18 wherein during the filling step the powder that the can is filled with, is a mixture of Ti+B+C.
Claim 25
Dependent Claim
25 words
A method as described in claim 18 wherein during the filling step the powder that the can is filled with, is a mixture of Ti+C.
Claim 26
Dependent Claim
27 words
A method as described in claim 18 wherein during the filling step the powder that the can is filled with, is a mixture of Carbon and Boron.
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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) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |