Claims
- 1. A filter for a cryogenic fluid comprising a composite comprising ceramic microparticles bound together in a ceramic binder formed from a sol-gel glass, the microparticles defining a porous matrix, the composite having a density in the range of about 7-23 lbs/ft.sup.3,
- wherein the microparticles include microspheres that are hollow glass microballoons about 5-200 .mu.m in diameter having a crush strength of about 500-4500 psi.
- 2. A method for filtering a liquid cryogen comprising passing said liquid through a composite as defined in claim 1.
- 3. The filter of claim 1 wherein the microparticles are selected from the group consisting of alumino-silicate, silica, alumina, boroaluminasilica, zirconia, silicon nitride, and mixtures thereof.
- 4. The filter of claim 1 wherein the composite includes ceramic whiskers selected from the group consisting of silicon carbide, silicon nitride, and alumina having a diameter in the range from about 0.4-1 .mu.m and an aspect ratio of about 100:1 length: diameter, the whiskers comprising about 5-30 wt % of the weight of the microparticles.
Parent Case Info
This application is a divisional application based upon U.S. patent application Ser. No. 08/068,272, filed May 24, 1993, now U.S. Pat. No. 5,398,840, which was a continuation application of U.S. patent application Ser. No. 07/560,382, filed Jul. 31, 1990, now abandoned, which was a continuation-in-part of application Ser. No. 381,498, filed Jul. 18, 1989, now abandoned, which is incorporated by reference herein.
This invention was made with government support under Contract No. F49620-88-C-0143 awarded by the Air Force. The Government has certain rights in this invention.
US Referenced Citations (14)
Divisions (1)
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68272 |
May 1993 |
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Continuations (1)
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Date |
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560382 |
Jul 1990 |
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Continuation in Parts (1)
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381498 |
Jul 1989 |
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