US4268562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser resistant ceramic composite
Assignee: United States Department of the Air Force
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Filing: 1979-08-30
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Granted: 1981-05-19
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Expires: 1999-08-30
Abstract
Abstract A hot pressed, biaxially oriented, alumina fiber reinforced, ceramic composite having alternate layers of parallel running alumina fibers within a glass matrix such that the fibers of one layer are positioned at right angles to the fibers of any adjoining layer.
Inventors
- 👤 James F. Bacon
- 👤 Karl M. Prewo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; B; B32; B32B; B32B18/00; C03; C03C; C03C14/00; C03C14/002; C04B35/01; C04B35/14; C04B35/16; C04B35/18; C04B35/195; C04B35/626; C04B35/62605; C04B35/62625; C04B35/6263; C04B35/62645; C04B35/62665; C04B35/71; C04B35/78; C04B35/80; C03C2214/00; C03C2214/02; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/36; C04B2235/365; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5224; C04B2235/60; C04B2235/616; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/96; C04B2235/9607; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/38; C04B2237/50; C04B2237/70; C04B2237/704; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24124; Y10T428/249921; Y10T428/249924; Y10T428/249928; Y10T428/249929; Y10T428/29; Y10T428/2913; Y10T428/2927
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
A method for fabricating a biaxially oriented fiber reinforced, ceramic composite which comprises the steps of: a. pulling a tow of alumina having a multitude of fibers in parallel relationship to one another through an agitated organic slurry containing a suspension of finely divided glass particles comprising about 95% by weight fused silica glass and about 5% by weight borosilicate glass in order to impregnate said tow; b. drying and cutting said impregnated tow into a sheet of predetermined shape; c. placing layers of said sheet into a metal die such that the parallel fibers of any one sheet are laid at right angles to the parallel fibers of any adjoining sheet therefore forming a 0°, 90° biaxially oriented structure; and d. hot pressing said layers at a temperature and pressure sufficient to form said reinforced ceramic composite.
Claim 2
Independent Claim
138 words
A method for fabricating a biaxially oriented fiber reinforced, ceramic composite which comprises the steps of: a. pulling a tow of alumina having a multitude of fibers in parallel relationship to one another through an agitated organic slurry containing a suspension of finely divided glass particles comprising about 95% by weight fused silica glass and about 5% by weight borosilicate glass in order to impregnate said tow; b. drying and cutting said impregnated tow into a sheet of predetermined shape; c. placing layers of said sheet into a metal die such that the parallel fibers of any one sheet are laid at right angles to the parallel fibers of any adjoining sheet therefore forming a 0°, 90° biaxially oriented structure; and d. hot pressing said layers at a temperature and pressure sufficient to form said reinforced ceramic composite.
Claim 3
Dependent Claim
21 words
A method in accordance with claim 1 wherein said glass slurry contains a solvent mixture of isopropyl alcohol and polyvinyl alcohol.
Claim 4
Dependent Claim
39 words
A method in accordance with claim 2 wherein said biaxially oriented structure is hot pressed for about one hour at a temperature of from about 1000° to 1400° C. and a pressure of from about 1000 to 4000 psi.
Claim 5
Dependent Claim
37 words
A method in accordance with claim 3 wherein said biaxially oriented structure is hot pressed for about one hour at a temperature of from about 1300° to 1350° C. and at a pressure of about 2000 psi.
Claim 6
Dependent Claim
113 words
A hot pressed, biaxially oriented, alumina fiber reinforced ceramic composite comprising at least a first and second series of alumina fibers, wherein a. said first series of alumina fibers are oriented in a parallel relationship to one another along a predetermined direction; b. said second series of alumina fibers are juxtapositioned to said first series of fibers and are oriented in a parallel relationship to one another along a direction at right angles to that direction of said first series of fibers; and c. a ceramic impregnant comprising about 95% by weight fused silica glass and about 5% by weight borosilicate glass permeating the interstices of said first and second series of fibers.
Claim 7
Dependent Claim
113 words
A hot pressed, biaxially oriented, alumina fiber reinforced ceramic composite comprising at least a first and second series of alumina fibers, wherein a. said first series of alumina fibers are oriented in a parallel relationship to one another along a predetermined direction; b. said second series of alumina fibers are juxtapositioned to said first series of fibers and are oriented in a parallel relationship to one another along a direction at right angles to that direction of said first series of fibers; and c. a ceramic impregnant comprising about 95% by weight fused silica glass and about 5% by weight borosilicate glass permeating the interstices of said first and second series of fibers.
Claim 8
Dependent Claim
28 words
A hot pressed, biaxially oriented, alumina fiber reinforced ceramic composite in accordance with claim 5 further comprising a plurality of said first and second series of alumina fibers.
Claim 9
Dependent Claim
27 words
A hot pressed, biaxially oriented, alumina fiber reinforced ceramic composite in accordance with claim 5 wherein said alumina fibers comprise about 50 volume percent of said composite.
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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) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |