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New Guide for The measurement of Gas Permeability and Gas Diffusivity of Carbon and Graphite
1. Scope
This guide covers the measurement of gas permeability and gas diffusivity of carbons and graphite. Two techniques are discussed, the static equilibrium method, an integrated method capable of measuring both gas permeability and gas diffusivity and the vacuum leak method, which measures the gas permeability of the specimen.
Keywords
gas transport properties; diffusivity; permeability
Rationale
Gas permeability and gas diffusivity are important properties required for correctly modeling and understanding interactions between gases and porous media, for example thermal and radiolytic oxidation, or the escape of gaseous fission by-products through graphite.
The test methods described in this guide can be used to characterize graphite and carbon materials for design purposes and post irradiation examination (PIE).
