The chemical vapor infiltration of exfoliated graphite to produce carbon/carbon composites

Chemical vapor infiltration was used for the production of carbon/carbon composites based on exfoliated graphite and pyrolytic carbon. Two different exfoliated graphites compacted to densities of 0.05–0.4 g/cm3 were used as a preform. The influence of the synthesis conditions (temperature, pressure, time etc.) on the degree of infiltration, the pyrolytic carbon morphology and the C/C composite characteristics was examined using Raman spectroscopy, scanning electron microscopy and low-temperature nitrogen adsorption.

Graphical abstractThe scheme of PC deposition depending on CVI conditions was proposed. Increasing of impulse duration and pressure provides dominating pyrocarbon infiltration into low-dense samples volume.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Pyrocarbon deposition on the substrate of exfoliated graphite of two types was carried out using CVI technique. ► Samples exfoliated graphite of electrochemical type shown higher saturation degree under soft conditions. ► Increasing of impulse duration and pressure provides dominating pyrocarbon infiltration into low-dense samples volume. ► The scheme of PC deposition depending on CVI conditions was proposed.