| Autor: |
Kilin, V. S., Cherednik, E. M., Lebedev, Yu. N., Dergunova, V. S., Ostrovskii, V. S. |
| Zdroj: |
Powder Metallurgy and Metal Ceramics; August 1977, Vol. 16 Issue: 8 p616-619, 4p |
| Abstrakt: |
1.Determinations were made of the rates of oxidation of carbon fibers with pyrolytic silicon carbide coatings of various thicknesses in atmospheric oxygen and carbon dioxide.2.It has been found that at all temperatures the rate of oxidation of coated carbon fibers decreases with increase in coating thickness irrespective of the nature of the oxidizing agent.3.It is shown that the energies of activation for the reactions C+O2 and C+CO2 on uncoated fibers and fibers with pyrolytic silicon carbide coatings are practically identical and equal to 37 and 58 kcal/mole, respectively.4.X-ray structural analyses of starting and oxidized fibers with coatings have demonstrated that starting fibers contain graphite and silicon carbide phases, while in oxidized fibers there is, in addition to silicon carbide, another phase, probably silica. |
| Databáze: |
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