IMPROVEMENTS IN OR RELATING TO GRAPHITE
Patent
·
OSTI ID:4794149
A process is given for reducing the permeability of a carbon or graphite body by a single impregnation treatment. The process comprises impregnating the body with a mixture of a monomer and a polymerization catalyst effective at elevated temperatures, dipping the body in a catalyst effective at ordinary temperatures to polymerize the monomer at the surface, and heating the body to polymerize the rest of the monomer. An example of the process is given in which the body was impregnated with furfuryl alcohol--benzal chloride, dipped in concentrated hydrochloric acid to polymerize the surface, washed, and heated to 120 deg C for 48 hr and then to 800 deg C. The permeability coefficient was reduced from 2.8 x 10/sup -2/ to 1.4 x 10/sup -6/ cm/sup 2//sec in this way, as compared with a reduction to 4.5 x 10/sup -4/ cm/sup 2/ sec for the same treatment without the surface polymerization step. (D.L.C.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-030763
- OSTI ID:
- 4794149
- Report Number(s):
- GB 904416
- Country of Publication:
- United Kingdom
- Language:
- English
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