Air oxidation of composites of a eutectic type with Si/C = 0.45–16.04 obtained by the method of self-propagating high-temperature synthesis in the high-energy system Mo — Si — C — Al is investigated. It is shown that the oxidation behavior of the specimens depends on the Si/C proportion. Specimens with Si/C = 4.17–16.04 are shown to have a very stable mass under long-term high-temperature oxidation (up to 1650 K with holds of up to 500 h). The method of Auger spectroscopy is used to show that the SiO2 film formed on the surface of the specimens is porous. It is inferred that the overall oxidation process includes stages that can cause a reduction of mass in some cases and growth of mass in other cases. This means that in a certain range of Si/C proportions the long-term stability of the mass of specimens of composites subjected to high-temperature oxidation is a result of mutual compensation of opposite processes.
Refractories and Industrial Ceramics – Springer Journals
Published: Nov 21, 2007
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