In fact, the impregnation process of the CFC is much more complicated. The impregnation process contains not only the action of external force but also the adsorption process.

The low molecules emitted in the impregnated will adsorb the multimolecular layer on the inner surface of the pore of the CFC assembly, which can improve the infiltration process of the liquid precursor to the inner wall of the pore and improve the impregnation effect. This adsorption is mainly a physical process.

Therefore, vacuum and use of higher pressure during impregnation allow the agent to be better penetrated into the micropores of the prefabricated body, thus facilitating the rapid compensification of the CFC.

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