The Influence of Processing Conditions on Gas Transport and Thermal Properties of Graphite Foil Compressed from Exfoliated Graphite

Graphite foil (GF) compressed from exfoliated graphite (EG) is a sealing material, which used in nuclear energy and the chemical industry. The preparation of complex process, includes intercalation graphite, water washing, thermal exfoliation pressing intermediate products. conditions significantly influence structure material its physicochemical properties. Thus, aim work was to reveal correlation between GF processing conditions, crystalline structure, porosity gas permeability as well stability. Sealability connected with low value permeability, while stability allows use high-temperature processes. Optimization these parameters allow for obtaining reliable expanding areas application. Exfoliated prepared at different temperatures 600, 800 1000 °C H2SO4–graphite compound (GIC) II, III, IV stages. (the GIC stage number EG temperature) on main properties (gas oxidation stability) materials investigated. A decrease leads formation lower macroporosity nitrogen hydrogen permeability. However, an increase surface area rate by air oxygen. An temperature oC results developed micro- mesoporosity increasing down 600 promotes new transport macropores GF. change has little effect