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What is the oxidizing temperature of niobium?

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What is the oxidizing temperature of niobium?

(a) 100^oC

(b) 200^oC

(c) 400^oC

(d) 600^oC

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This key question is from Refractory Materials, Superalloys in portion Refractories & Dielectric Materials of Engineering Material & Metallurgy

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The correct choice is (c) 400^oC

Easy explanation: Niobium is a common nuclear and aerospace material which is often found and used with tantalum. Oxidization of niobium occurs above 400^oC. To prevent this oxidization, a protective coating is applied to the material to keep it from becoming too brittle.

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