Abstract
We study the processes of high-temperature oxidation in Nb-Ti, Nb-Ti-Si, and Nb-Ti-Si-Mo systems and propose a mechanism of oxidation of VN-10 niobium alloy highly alloyed with titanium (up to 50%), a Ti-Nb-Ti composite multilayer material, and unalloyed niobium and VN-10 alloy subjected to diffusion saturation of their surface with silicon and molybdenum. It is shown that high alloying and (to a lesser extent) Ti-cladding of niobium allow one to suppress the process of catastrophic high-temperature oxidation of it and increase significantly the heat resistance of the material. Additional formation of diffusion silicide and molybdenum-silicide layers on the surface of niobium alloys increases their heat resistance by more than a factor of ten.
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