US4390583A
Expired / Lapsed
US
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Alumina-alumina composite
Assignee: General Electric Co
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Filing: 1982-02-22
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Granted: 1983-06-28
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Expires: 2002-02-22
Abstract
Abstract Multifilament fibers of alumina are fabricated into a multi-directional preform which is densified through repeated infiltration with an aqueous solution of colloridal alumina, dried and fired.
Inventors
- 👤 James P. Brazel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:18
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; B; B28; B28B; B28B1/00; B28B1/002; B28B19/00; B28B23/00; B28B23/0006; C04B35/71; C04B35/78; C04B35/80; C04B2235/00; C04B2235/02; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5224; C04B2235/5268; C04B2235/60; C04B2235/616; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/96; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24124; Y10T428/29; Y10T428/2913
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
43 words
An alumina-alumina composite comprising: a plurality of alumina fibers arranged parallel to at least three axial directions; each of said fibers comprising a plurality of alumina filaments in a matrix of alumina; and said plurality of fibers further contained in an alumina matrix.
Claim 2
Dependent Claim
43 words
An alumina-alumina composite comprising: a plurality of alumina fibers arranged parallel to at least three axial directions; each of said fibers comprising a plurality of alumina filaments in a matrix of alumina; and said plurality of fibers further contained in an alumina matrix.
Claim 3
Dependent Claim
75 words
An alumina-alumina composite comprising: a plurality of alumina fibers oriented in at least three directions in a regular pattern with the fibers oriented in one direction positioned adjacent to fibers oriented in at least two of the other directions; a matrix of alumina enveloping said fibers and interspersed between the filaments forming said fibers; said fibers being a polycrystalline form of alumina; and said matrix being a combination of glassy and gamma forms of alumina.
Claim 4
Dependent Claim
75 words
An alumina-alumina composite comprising: a plurality of alumina fibers oriented in at least three directions in a regular pattern with the fibers oriented in one direction positioned adjacent to fibers oriented in at least two of the other directions; a matrix of alumina enveloping said fibers and interspersed between the filaments forming said fibers; said fibers being a polycrystalline form of alumina; and said matrix being a combination of glassy and gamma forms of alumina.
Claim 5
Dependent Claim
15 words
An alumina-alumina composite in accordance with claims 1 or 2 wherein: said fibers are α-alumina.
Claim 6
Dependent Claim
20 words
An alumina-alumina composite in accordance with claims 1 or 2 wherein: said matrix is predominantly a non-crystalline form of alumina.
Claim 7
Dependent Claim
15 words
An alumina-alumina composite in accordance with claim 2 wherein: one of said directions is circumferential.
Claim 8
Dependent Claim
13 words
An alumina-alumina composite in accordance with claim 2 wherein: said fibers are multi-filament.
Claim 9
Independent Claim
51 words
The method of fabricating a three-dimensional alumina-alumina composite comprising: assembling a plurality of alumina fibers into a preform wherein said fibers have at least three directions; and forming an alumina matrix on said preform by repeated cycles of: a. infiltration with a sol of alumina, and b. heating the infiltrated preform.
Claim 10
Independent Claim
51 words
The method of fabricating a three-dimensional alumina-alumina composite comprising: assembling a plurality of alumina fibers into a preform wherein said fibers have at least three directions; and forming an alumina matrix on said preform by repeated cycles of: a. infiltration with a sol of alumina, and b. heating the infiltrated preform.
Claim 11
Independent Claim
102 words
The method of fabricating a three dimensional alumina-alumina composite comprising: forming a plurality of rigidized rods of alumina by coating a fiber having a multiplicity of α-alumina filaments with a temporary binder drawing said rods through a protrusion die, and drying the binder; assembling said rigidized rods into a preform structure in which said rods are positioned in a parallel arrangement with at least three directions; removing said temporary binder by pyrolyzing; and forming an alumina matrix on said preform by repeated cycles of: a. infiltration with a sol of alumina, b. drying to remove the liquid, and c. firing said structure.
Claim 12
Independent Claim
102 words
The method of fabricating a three dimensional alumina-alumina composite comprising: forming a plurality of rigidized rods of alumina by coating a fiber having a multiplicity of α-alumina filaments with a temporary binder drawing said rods through a protrusion die, and drying the binder; assembling said rigidized rods into a preform structure in which said rods are positioned in a parallel arrangement with at least three directions; removing said temporary binder by pyrolyzing; and forming an alumina matrix on said preform by repeated cycles of: a. infiltration with a sol of alumina, b. drying to remove the liquid, and c. firing said structure.
Claim 13
Independent Claim
98 words
The method of fabricating a three dimensional alumina-alumina composite comprising: forming a plurality of rigidized rods of alumina by coating a fiber having a multiplicity of alumina filaments with an acrylic resin, drawing said rods through a protrusion die, and drying the resin; assembling said rigidized rods into a preform structure in which said rods are positioned in a parallel arrangement with at least three directions; and forming an alumina matrix on said preform by repeated cycles of: a. infiltration with an aqueous solution of colloidal alumina, b. drying to remove the water, and c. firing said structure.
Claim 14
Independent Claim
98 words
The method of fabricating a three dimensional alumina-alumina composite comprising: forming a plurality of rigidized rods of alumina by coating a fiber having a multiplicity of alumina filaments with an acrylic resin, drawing said rods through a protrusion die, and drying the resin; assembling said rigidized rods into a preform structure in which said rods are positioned in a parallel arrangement with at least three directions; and forming an alumina matrix on said preform by repeated cycles of: a. infiltration with an aqueous solution of colloidal alumina, b. drying to remove the water, and c. firing said structure.
Claim 15
Dependent Claim
15 words
The method in accordance with claim 7, 8 or 9 wherein: said fiber is α-alumina.
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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) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |