Refractory metals are a class of metals that are extraordinarily resistant to heat and wear. The expression is mostly used in the context of materials science, metallurgy and engineering. The definition of which elements belong to this group differs. The most common definition includes five elements: two of the fifth period (niobium and molybdenum...
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http://en.wikipedia.org/wiki/Refractory_metals
include tungsten, tantalum and molybdenum; used for electrode materials because they have a low, uniform surface potential, do not oxidize, and are bakeable
Found on
http://www.chemistry-dictionary.com/definition/refractory+metals.php
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