Abstract
We have studied the processes of oxidation of unalloyed niobium and titanium and also an alloy of the niobium-titanium system, high-alloyed with titanium (up to 50%), in air at temperatures of 100–1100°C. Data on the structure, composition, and physicomechanical properties of gassaturated layers as well as on the crystallographic features of oxides forming them have been obtained. As a result, we conclude that the mechanism of alloy oxidation is multistage and includes the formation from lower and higher oxides to a compound with a structure close to rutile. We have also shown that the alloying of niobium with titanium enables one to suppress the catastrophic high-temperature oxidation of niobium and to enhance substantially its refractoriness.
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