Patent US4642271A successfully refreshed from Google Patents.
US4642271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
BN coating of ceramic fibers for ceramic fiber composites
Assignee: UNITED TATES OF AMERICA NAVY, Secretary of
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Filing: 1985-02-11
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Granted: 1987-02-10
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Expires: 2005-02-11
Abstract
Abstract A ceramic fiber composite material comprised of boron nitride coated ceramic fibers embedded in a ceramic matrix. The boron nitride coating limits both physical bonding and chemical reaction between the fibers and matrix to improve both strength and toughness of the composite material.
Inventors
- 👤 Roy W. Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/01; C04B35/14; C04B35/16; C04B35/18; C04B35/185; C04B35/195; C04B35/48; C04B35/486; C04B35/488; C04B35/515; C04B35/56; C04B35/565; C04B35/622; C04B35/626; C04B35/628; C04B35/62844; C04B35/62857; C04B35/62865; C04B35/62868; C04B35/62897; C04B35/83; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3231; C04B2235/3232; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5224; C04B2235/524; C04B2235/5244; C04B2235/5248; C04B2235/5264; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/96; C04B2235/9669; C04B2235/9684; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10S428/903; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2933; Y10T428/2938; Y10T428/294; Y10T428/2956
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
40 words
In a ceramic fiber composite, a composition comprising: a plurality of ceramic fibers; a fiber coating of boron nitride disposed over each fiber to form a plurality of coated fibers; and a ceramic matrix encapsulating said plurality of coated fibers.
Claim 2
Dependent Claim
40 words
In a ceramic fiber composite, a composition comprising: a plurality of ceramic fibers; a fiber coating of boron nitride disposed over each fiber to form a plurality of coated fibers; and a ceramic matrix encapsulating said plurality of coated fibers.
Claim 3
Dependent Claim
26 words
The ceramic fiber composite according to claim 1, wherein said composition further comprises at least a 30 percent of said plurality of coated fibers by volume.
Claim 4
Dependent Claim
28 words
The ceramic fiber composite according to claim 2, wherein said composition further comprises said plurality of coated fibers in the range of 40 to 60 percent by volume.
Claim 5
Dependent Claim
27 words
The ceramic fiber composite according to claim 3, wherein said composition further comprises said plurality of coated fibers with a coating thickness of at least 1 angstrom.
Claim 6
Dependent Claim
30 words
The ceramic fiber composite according to claim 4, wherein said composition further comprises said plurality of coated fibers with said coating thickness in the range of 0.05 to 0.3 micron.
Claim 7
Dependent Claim
28 words
The ceramic fiber composite according to claim 5, wherein said composition further comprises said plurality of coated fibers having thicknesses in the range of 1 to 150 microns.
Claim 8
Dependent Claim
31 words
The ceramic fiber composite according to claim 6, wherein said composition further comprises said plurality of fibers selected from the group of SiC, Al 2 O 3 , and graphite fibers.
Claim 9
Dependent Claim
39 words
The ceramic fiber composite according to claim 7, wherein said composition further comprises said ceramic matrix selected from the group of SiO 2 , SiC, ZrO 2 , ZrO 2 -TiO 2 , cordierite mullite and coated carbon matrices.
Claim 10
Dependent Claim
112 words
In a ceramic fiber composite, a composition comprising: a plurality of ceramic fibers, selected from the group of SiC, Al 2 O 3 , and graphite fibers ranging from 5 to 10 microns in thickness; a fiber coating of boron nitride having a thickness in the range of 0.1 micron disposed over each fiber to form a plurality of coated fibers; and a ceramic matrix selected from the group of SiO 2 , SiC, ZrO 2 , ZrO 2 -TiO 2 , mullite and coated carbon matrices encapsulating said plurality of coated fibers to form a composite having in the range of 40 to 60 percent of said coated fibers by volume.
Claim 11
Dependent Claim
112 words
In a ceramic fiber composite, a composition comprising: a plurality of ceramic fibers, selected from the group of SiC, Al 2 O 3 , and graphite fibers ranging from 5 to 10 microns in thickness; a fiber coating of boron nitride having a thickness in the range of 0.1 micron disposed over each fiber to form a plurality of coated fibers; and a ceramic matrix selected from the group of SiO 2 , SiC, ZrO 2 , ZrO 2 -TiO 2 , mullite and coated carbon matrices encapsulating said plurality of coated fibers to form a composite having in the range of 40 to 60 percent of said coated fibers by volume.
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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 |