Abstract
Hydrogen gas driven permeation through fine-grain graphite MPG-8 has been investigated in the range of thickness from 0.55 to 4.38mm and pressures from 10−2 to 1Pa. The permeation rate is proportional to the gas pressure and inversely proportional to the thickness. It has been concluded that GDP through fine-grain graphite is due to gas flow through the internal porosity network in the molecular regime. The specific bulk conductivity of the graphite is measured to be of about (5–7.3)×1015moleculess−1m−1Pa−1. Surface treatment influences the permeation through membranes thinner than 1mm. Surface polishing, washing in the ultrasonic bath, hydrogen and argon plasma irradiation, methane plasma treatment, argon ion irradiation, and annealing at 1000K have 0–10% influence on the permeation rate.
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