tantalum-tungsten alloy

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• Tantalum — (pronEng|ˈtæntələm) (formerly tantalium IPA|/tænˈtæliəm/) is a chemical element with the symbol Ta and atomic number 73. A rare, hard, blue grey, lustrous, transition metal, tantalum is highly corrosion resistant and occurs naturally in the… …   Wikipedia

• Molybdenum — niobium ← molybdenum → technetium Cr ↑ Mo ↓ W …   Wikipedia

• Conflict minerals — are minerals mined in conditions of armed conflict and human rights abuses, notably in the eastern provinces of the Democratic Republic of the Congo, by the Congolese National Army and various armed rebel groups, including the Democratic Forces… …   Wikipedia

• Mercury (element) — gold ← mercury → thallium Cd ↑ Hg ↓ Cn …   Wikipedia

• Metal — This article is about metallic materials. For other uses, see Metal (disambiguation). Some metal pieces Metals Alkali metals …   Wikipedia

• thorium processing — Introduction       preparation of the ore for use in various products.       Thorium (Th) is a dense (11.7 grams per cubic centimetre), silvery metal that is softer than steel. It has a high melting temperature of approximately 1,750° C (3,180°… …   Universalium

• Rhenium — tungsten ← rhenium → osmium Tc ↑ Re ↓ Bh …   Wikipedia

• Niobium — zirconium ← niobium → molybdenum V ↑ Nb ↓ Ta …   Wikipedia

• rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …   Universalium

• Refractory metals — are a class of metals that are extraordinarily resistant to heat and wear. Refractory metals are said to be poorly resistant to oxidation and corrosion. [UFL EMA 6625: Advanced Metal Processing, Summer 2008, Lecture 09] These properties make them …   Wikipedia

• niobium processing — Introduction       preparation of the ore for use in various products.       Niobium (Nb) has a body centred cubic (bcc) crystal structure and a melting point of 2,468° C (4,474° F). Of the refractory metals, it has the lowest density and best… …   Universalium