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The oxidation behavior of polyimide-derived carbon films doped with boron in low levels (up to 1.23x10 -2 B/C) was investigated by means of thermogravimetric analysis (TGA). It was observed that boron-doping less than 7.09x10 -3 B/C in the carbon film formed at 1500 o C had a catalytic effect on the oxidation of the carbon. Based on a kinetic analysis, it is revealed...
C–SiC–B 4 C composite materials were fabricated from pitch based needle coke, SiC and B 4 C with or without SiC nanoparticulate additive by grinding and then pressureless sintering. Anisothermal and isothermal oxidation tests of the composites obtained were carried out in oxygen flow at temperature increasing continuously from 773 to 1573K. Self-protection behavior of the composites...
The decarbonization and oxidation processes in ceramic-carbon composites during oxidation in gaseous oxygen have been studied theoretically. The influences of temperature, duration of time, content of ceramic in the composites and other factors on the oxidation are discussed kinetically. According to the model, the recession rate of the carbon matrix will slow down rapidly with decrease of ceramic...
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