With propylene as carbon source, hydrogen and argon as carrier gas, isotropic pyrolysis carbon block materials were produced by fixed matrix CVD method in a self-designed chemical vapor deposition (CVD) furnace. It shows that the oxidation characteristics of carbon materials are closely related to the types of internal defects and densities of carbon materials. The oxidation process at low temperature obeys the law of straight line. And the oxidation reaction mainly occurs in the internal banded pyrolysis carbon structure.

Graphite powder reinforced pyrolysis carbon matrix composites (G/C Composites) were produced by thermal gradient chemical vapor infiltration process. G/C composites can combine with graphite particles in different directions to fully fill the pores between graphite particles. With the increase of heat treatment temperature, the inter-layer space of isotropic pyrolysis carbon is decreasing, graphitization degree is increasing, and the grain size is also increasing at the same time. Meanwhile, the pore structure in the materials also changes greatly. The microhardness and elastic modulus of the material decrease with the increase of heat treatment temperature. The flexural strength does not change among 1750℃~2400℃, but significantly increase at 2600℃.

Graphite powder reinforced pyrolysis carbon matrix composites show to be isotropic, high density (1.85g/cm3), high volume resistance (148.4 μΩ. m) and excellent mechanical properties (bending strength 50 MPA, compression strength  120MPa). The mechanical properties of G/C composites are twice as high as pure graphite. The compression strength of G/C composites is almost the same as C/C composites reinforced by carbon felt. The bending strength of G/C composites is slightly lower than C/C composites reinforced by carbon felt.

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