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Coating of graphite by polyimide and its gas permeability

✍ Scribed by T. Sogabe; M. Inagaki; T. Ibuki

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
393 KB
Volume
30
Category
Article
ISSN
0008-6223

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✦ Synopsis

Gas permeability of a high-density isotropic graphite block was reduced by coating the carbonization of aromatic polyimide by using a solution of polyamic acid. Imidization at 400Β°C in nitrogen atmosphere after the solvent was vaporized out was essential for good adhesion with graphite substrate. By repetition of coating, imidization at 4OU"C, and carbonization at 1000' C, the permeability was reduced to 2.4 x 1OP cm21sec from 1.3 x 10-l cm'isec for the originai. The carbonization at 450Β°C gave much lower permeability of 5.0 x 10m6 cm*/sec with pure slip flow.

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