Refractory Metals

Refractory Metals

Refractory metals are those metals on the periodic table that possess high melting points. At elevated temperatures, refractory metals have excellent mechanical properties. Except for tungsten, all show excellent ductility.

Applications Supported by Ultramet

Tungsten, 6165°F (3407°C)
No hydrogen embrittlement

High temperature crystal-growth crucibles
Explosively formed warheads
High temperature furnace elements and heat shields

Rhenium, 5756°F (3180°C)
Ductility, strength at temperature, no hydrogen embrittlement

High-performance rocket engines
In combination with platinum, a reforming catalyst in the production of gasoline
Alloying agent in turbine blade superalloys

Tantalum, 5457°F (3014°C)
Biocompatibility, excellent corrosion resistance

Biomedical implants
Chemical process industry—even thin films of tantalum protect steels and nickel-based alloys against acid attack
High temperature furnaces for the manufacture of capacitors

Molybdenum, 4743°F (2617°C)
No hydrogen embrittlement

Glass-forming industry for melt electrodes
Nozzles for making glass fibers and other items that come in contact with molten glass

Niobium, 4473°F (2467°C)
Less corrosion resistance, lower cost than tantalum

Chemical process industry
High temperature crystal-growth crucibles
Ruthenium Osmium Rhodium Iridium Palladium Platinum Platinum group metals are unique among the transition metals because (except for osmium) they combine excellent catalytic activity with low chemical reactivity. As a result, the platinum group metals at Ultramet are used primarily for two purposes: protective and catalytic coatings. Iridium and platinum are most