Rare refractory metals
Class: Non-Ferrous MetalsGroup: Rare MetalsSubgroup: Rare Refractory MetalsRefractory metals are a class of metals that are extraordinarily resistant to heat and wear. Refractory metals have a melting point higher than 1650 ºС. The subgroup of Refractory Metals is divided into: Basic and Wider definition.The Basic of Refractory Metals includes the following metals: Niobium (Nb), Tantalum (Ta), Molybdenum (Mo), Tungsten (W), Rhenium (Re)The Wider definition of refractory metals consists of the following elements: Titanium (Ti), Vanadium (V), Chromium (Cr),Zirconium (Zr), Hafnium (Hf), Osmium (Os), Ruthenium (Ru), Rhodium (Rh), Iridium (Ir)In my opinion, the most promising the following Refractory metals:Niobium (Nb)
Tantalum (Ta)
Titanium (Ti)
Rhenium (Re)
Hafnium (Hf)
Zirconium (Zr)
The subgroup of Refractory Metalsiinclude metals (Basic) and semi-metals (Wider definition).References
Ph.D. Natalia Petrovskaya. Fundamentals of the theory of flotation, 2007
https://en.wikipedia.org/wiki/Refractory_metals
https://www.rwmmint.com/products/tantalum
https://en.wikipedia.org/wiki/Heavy_metals
© Ph.D. Natalia Petrovskaya
October 20, 2016
nataliapetrovsky@gmail.com