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Patent Number: |
7494691 |
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Case ID: |
0 |
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Patent Title:
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Coating ceramic fiber tows and woven articles
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Status: |
ACTIVE |
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Status Date: |
2/3/2010 1:54:31 PM |
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Issue Date:
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2/24/2009 |
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Filed Date:
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12/21/2004 |
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Serial #:
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1/021,900 |
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Assignee Name:
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The United States of America as represented by the Secretary of the Air Force
(Washington,
DC)
N/A
(
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Inventor(s):
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Fair, Geoff E. , Boakye, Emmanuel E. , Parthasarathy, Triplicane A. |
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Lab Name: |
Materials & Manufacturing Directorate |
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Location: |
Building 653, Room 406
Wright-Patterson AFB, OH 45433-7734 |
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Contact: |
Contact Lab About This Patent |
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BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of synthetic fibers, and in particular, the coating of ceramic fibers and woven articles comprised of ceramic fibers.
2. Description of the Related Art
Ceramic materials are attractive for a wide range of applications, offering important advantages over other materials. Such advantages include, for example, low weight, high-temperature resistance and thermal stability, erosion resistance,
chemical inertness and environmental stability. Ceramic materials are therefore highly desirable for a number of applications despite their brittleness, flaw sensitivity and propensity for catastrophic failure. It is highly desirable to utilize the
advantages of ceramic materials while increasing both the strength and toughness of ceramic materials thereby overcoming the drawback of their brittle properties.
A common technique to reduce the brittle behavior of c . . . . More |
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An improved method for coating ceramic fibers and woven cloths of ceramic
fibers is disclosed, wherein the ceramic fibers are thoroughly wetted
with precursors in a solution before the precursors react to form a
coating by heterogeneous nucleation and growth. The fibers are then
rinsed and fired and, where desired, the process may be repeated in
stages to increase the coating thickness as desired. This method is
amenable to operation in both the batch and continuous modes. This
flexible method reduces both the cost and time of producing ceramic
matrix composites (CMCs).
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We claim:
1. A method of coating ceramic fibers, comprising: combining a plurality of coating precursors into a chilled precursor solution; inserting the ceramic fibers into said chilled
precursor solution; wetting the ceramic fibers with said chilled precursor solution; increasing the temperature of said chilled precursor solution; and removing the ceramic fibers from said chilled precursor solution.
2. The method of claim 1, wherein said plurality of coating precursors include lanthanum citrate and phosphoric acid.
3. The method of claim 1, further comprising the step of inserting the ceramic fibers into hot immiscible liquid.
4. The method of claim 1, further comprising the step of mechanically agitating said chilled precursor solution containing the ceramic fibers and said plurality of coating precursors.
5. The method of claim 4, wherein said step of mechanically agitating said chilled precursor solution includes rolling the cer . . . . More |
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