Rhenium

Rhenium is a refractory metal with melting point of 3180°C, the third highest of all elements after tungsten and carbon, but its boiling point is the highest of all the elements. Rhenium has the fourth highest density among all elements, with the first three being osmium, iridium and platinum. Rhenium is also a rare element. It is found in the earth’s crust in less than all rare-earth elements, about 1.0×10-7%, which only larger than elements such as protactinium and radium. It does not form a fixed mineral and is usually associated with other metals. In nature, rhenium is distributed at very low content in molybdenite, rare earth ore and niobium tantalite ore.
Rhenium has the smae appearance of platinum, it is a silver-white metal or gray powder or black powder.
Rhenium metals are highly ductile and can be bent and rolled up in annealing.
The metal rhenium is very hard, wear – resistant, corrosion – resistant, with good mechanical properties.

When at standard temperature and pressure, Rhenium blocks are resistant to alkali, sulphate, hydrochloric acid, dilute nitric acid (non-concentrated nitric acid) and aqua ileum.
When at high temperature, Rhenium combines with sulfur vapor to form rhenium sulfide (ReS2). Rhenium does not react with hydrogen and nitrogen, but can absorb H2. Rhenium has a valence of 3, 4, 6 and 7. Rhenium can be oxidized to a very stable rhenium sesquioxide (Re2O7), which is a specail nature of Rhenium.

Density：21.04g/cm3
Melting point：3180°C
Boiling point：5627°C
Volume modulus of elasticity：370GPa
Heat capacity：25.48 J /(mol· K)
Heat conductivity coefficient：48.0W/(m·K)
Electroconductivity：0.0542 x 106/(cm ·Ω)
Rhenium becomes a superconductor at 1.697±0.006k.
Rhenium-Molybdenum alloy becomes a superconductor at 10K.
Rhenium-Tungsten alloy becomes a superconductor at 4-8K.

Rhenium is widely used in various sectors of modern industry, mainly as catalyzer for petroleum industry, automobile industry and petroleum reforming.
Rhenium alloys are usually used for electronics industry and aerospace industry.
Main applications of Rhenium as follows
(1)Used as catalyzer for petroleum industry
(2)Rhenium is widely used in radio, television and vacuum technology because of its high electron emission performance.
(3)Rhenium, which has a high melting point, is a main material for high temperature instruments. Rhenium alloys are also used in the manufacture of heat-resistant components of aircraft engines, with about 80% of rhenium used globally in the production of aircraft engines.
(4)Rhenium and its alloys can also be used as evacuated tube elements and ultra-high temperature heaters for metal vaporation.
(5)Rhenium is used as a high-temperature coating on rockets and missiles, as well as for spacecraft high-temperature components and instruments such as heat-shield, arc discharge and contactors.
(6)Tungsten-rhenium thermocouples do not soften at 3100°C. Tungsten or molybdenum alloys by adding 25% rhenium to increase ductility.
(7)Rhenium and its alloys are used as catalysts in alcohol dehydrogenation and ammonia synthesis.
(8)Rhenium is also used to make electric filaments, the shells of artificial satellites and rockets, the protective plates of atomic reactors.

Precision tube

• _◎ OD 6.0 ~ 100.0 mm
• _◎ ID 4.0 ~ 90.0 mm