Influence of deposition temperature on density uniformity of carbon/carbon composites

2D-carbon/carbon composites were fabricated by a rapid chemical liquid-vaporized infiltration (CLVI) processing. Pores and density along the radial direction of the composite sample deposited at different temperatures were measured by means of Leica quantitative metallography and Archimedes principle methods. Morphologies and pores of the composites were observed by scanning electron microscopy. The results indicate that the porosity obtained by quantitative metallography is slightly higher than that measured by the Archimedes principle. When the deposition temperature is equal to or less than 1200°C, with the increase of the deposition temperature the residual porosity decreases, the density of the composite increases and the density along the radial direction exhibits uniform distribution. However, the pore distribution of the composite deposited at 1250°C is uniform, but there are many more and much larger residual pores in these samples.