US4537818A
Expired / Lapsed
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Method for production of ceramic oxide and carbide bodies by polymer inclusion and decomposition
Assignee: United States Department of Energy
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Filing: 1984-08-30
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Granted: 1985-08-27
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Expires: 2004-08-30
Abstract
Abstract A method for the preparation of thin, free-standing metal oxide films which are useful as nuclear accelerator target materials. Cations of any metal except those of Group IA and precious metals, such as, U, Zr, Nd, Ce, Th, pr or Cr, are absorbed on a thin film of polymeric material, such as, carboxymethylcellulose, viscose rayon or cellophane. The cation impregnated polymeric material is dried. Then the impregnated film is heated in an inert atmosphere to form a carbonized membrane. The carbonized membrane is oxidized to yield a thin, self-supporting, metal oxide membrane. Or, the membrane can be heated in an inert atmosphere to yield a thin, self-supporting, metal carbide-containing membrane.
Inventors
- 👤 Thomas C. Quinby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:03
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/51; C04B35/62218; C04B35/62231; H; H05; H05H; H05H6/00; Y; Y10; Y10T; Y10T428/00; Y10T428/30; Y10T442/00; Y10T442/30; Y10T442/60
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
81 words
Process for the preparation of a thin, free-standing metal oxide film comprising: (a) absorbing cations of a metal which forms a stable oxide on a thin film of polymeric material selected from the group consisting of carboxymethylcellulose, viscose rayon and cellophane; (b) drying the film of cation-impregnated polymeric material; (c) heating the dried film of cation-impregnated polymeric material in an inert atmosphere to form a carbonized membrane; and (d) oxidizing the carbonized membrane to yield a thin, self-supporting, metal oxide membrane.
Claim 2
Dependent Claim
81 words
Process for the preparation of a thin, free-standing metal oxide film comprising: (a) absorbing cations of a metal which forms a stable oxide on a thin film of polymeric material selected from the group consisting of carboxymethylcellulose, viscose rayon and cellophane; (b) drying the film of cation-impregnated polymeric material; (c) heating the dried film of cation-impregnated polymeric material in an inert atmosphere to form a carbonized membrane; and (d) oxidizing the carbonized membrane to yield a thin, self-supporting, metal oxide membrane.
Claim 3
Dependent Claim
20 words
The process as claimed in claim 1 wherein the thin film of polymeric material is a thin film of carboxymethylcellulose.
Claim 4
Dependent Claim
33 words
The process as claimed in claim 1 wherein the cation of the metal is the nitrate cation of uranium nitrate, zirconium nitrate, thorium nitrate, praseodymium nitrate, neodymium nitrate, chromium nitrate or cerium nitrate.
Claim 5
Dependent Claim
27 words
The process as claimed in claim 1 wherein the metal is any metal except a metal of Group 1A of the Periodic Table or a precious metal.
Claim 6
Dependent Claim
19 words
The process as claimed in claim 1 wherein the absorption is conducted in an aqueous solution containing the cations.
Claim 7
Dependent Claim
25 words
The process as claimed in claim 5 wherein the cation molarity of the aqueous solution containing the cations is between about 0.05 and about 1.0.
Claim 8
Dependent Claim
25 words
The process as claimed in claim 5 wherein the cation molarity of the aqueous solution containing the cations is between about 0.1 and about 0.5.
Claim 9
Dependent Claim
18 words
The process as claimed in claim 1 wherein the thin film of polymeric material is a non-woven material.
Claim 10
Dependent Claim
46 words
The process as claimed in claim 1 wherein the metal oxide forming the thin, free-standing film is CeO 2 , ThO 2 , Pr 2 O 3 , Cr 2 O 3 , U 3 O 8 , ZrO 2 or Nd 2 O 3 .
Claim 11
Dependent Claim
32 words
The process as claimed in claim 1 wherein the thin film of polymeric material is a flat contiguous film and wherein the resultant thin, free-standing film is thin, flat, contiguous, ceramic film.
Claim 12
Dependent Claim
30 words
The process as claimed in claim 1 wherein the thin film of polymeric material is a woven fabric and wherein the resultant thin, free-standing film is a woven, ceramic fabric.
Claim 13
Dependent Claim
20 words
The process as claimed in claim 1 wherein oxidizing step (d) is conducted by contacting the hot membrane with air.
Claim 14
Dependent Claim
12 words
The thin, free-standing film as produced by the process of claim 1.
Claim 15
Dependent Claim
21 words
The thin, free-standing film as claimed in claim 13 wherein the thin, free-standing film is a thin, flat contiguous, ceramic film.
Claim 16
Dependent Claim
48 words
The thin, free-standing film as claimed in claim 14 wherein the thin, flat, contiguous, ceramic film is comprised of CeO 2 , ThO 2 , Pr 2 O 3 , Cr 2 O 3 , U 3 O 8 , ZrO 2 or Nd 2 O 3 .
Claim 17
Dependent Claim
19 words
The thin, free-standing film as claimed in claim 13 wherein the thin, free-standing film is a non-woven, ceramic fabric.
Claim 18
Dependent Claim
88 words
Process for the preparation of a thin, free-standing metal oxide or metal carbide film comprising: (a) absorbing cations of an inorganic acid which forms a carbide on a thin film of polymeric material selected from the group consisting of carboxymethylcellulose, viscose rayon and cellophane; (b) drying the film of cation-impregnated polymeric material; (c) heating the dried film of cation-impregnated polymeric material in an inert atmosphere to form a carbonized membrane; and (d) heating the carbonized membrane in an inert atmosphere to yield a thin, self-supporting, metal carbide-containing membrane.
Claim 19
Dependent Claim
88 words
Process for the preparation of a thin, free-standing metal oxide or metal carbide film comprising: (a) absorbing cations of an inorganic acid which forms a carbide on a thin film of polymeric material selected from the group consisting of carboxymethylcellulose, viscose rayon and cellophane; (b) drying the film of cation-impregnated polymeric material; (c) heating the dried film of cation-impregnated polymeric material in an inert atmosphere to form a carbonized membrane; and (d) heating the carbonized membrane in an inert atmosphere to yield a thin, self-supporting, metal carbide-containing membrane.
Claim 20
Dependent Claim
20 words
The process as claimed in claim 17 wherein the thin film of polymeric material is a thin film of carboxymethylcellulose.
Claim 21
Dependent Claim
17 words
The process as claimed in claim 17 wherein the cation is the cation of an inorganic acid.
Claim 22
Dependent Claim
15 words
The process as claimed in claim 17 wherein the cation is obtained from boric acid.
Claim 23
Dependent Claim
22 words
The process as claimed in claim 17 wherein the absorption is conducted in a hot or boiling aqueous solution containing the cations.
Claim 24
Dependent Claim
19 words
The process as claimed in claim 17 wherein the absorption is conducted in an aqueous solution containing the cations.
Claim 25
Dependent Claim
25 words
The process as claimed in claim 22 wherein the cation molarity of the aqueous solution containing the cations is between about 0.05 and about 1.0.
Claim 26
Dependent Claim
25 words
The process as claimed in claim 22 wherein the cation molarity of the aqueous solution containing the cations is between about 0.1 and about 0.5.
Claim 27
Dependent Claim
17 words
The process as claimed in claim 17 wherein the thin film of polymeric material is woven material.
Claim 28
Dependent Claim
19 words
The process as claimed in claim 17 wherein the metal carbide forming the thin, free-standing, film is boron carbide.
Claim 29
Dependent Claim
32 words
The process as claimed in claim 17 wherein the thin film of polymeric material is a flat contiguous film and wherein the resultant thin, free-standing film is thin, flat, contiguous, ceramic film.
Claim 30
Dependent Claim
30 words
The process as claimed in claim 17 wherein the thin film of polymeric material is a woven fabric and wherein the resultant thin, free-standing film is a woven, ceramic fabric.
Claim 31
Dependent Claim
12 words
The thin, free-standing film as produced by the process of claim 17.
Claim 32
Dependent Claim
21 words
The thin, free-standing film as claimed in claim 29 wherein the thin, free-standing film is a thin, flat contiguous, ceramic film.
Claim 33
Dependent Claim
19 words
The thin, free-standing film as claimed in claim 29 wherein the thin, free-standing film is a woven, ceramic fabric.
Claim 34
Dependent Claim
23 words
The thin, free-standing film as claimed in claim 31 wherein the woven, ceramic fabric is comprised of boron carbide in a carbon matrix.
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) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |