The density and specific heat of rhenium and rhenium alloys
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Chemical properties of rhenium
Rhenium is a rare silvery metal, very solid, resistant to corrosion, but will dim slowly in the humid air.
Because of its high melting point (31850 C) is used in production technologies of rocket engines. Rhenium is added to tungsten and molybdenum to form alloys that are used as filaments for ovens and lamps.
It is also used in thermocouples which can measure temperatures above 2000° C,
Rhenium, alloyed with platinum, is used in refinery catalysis in the production of high-octane hydrocarbons, used for lead free gasoline.
Rhenium-molybdenum alloys are superconductors at the temperature of 10 K.
Free-form rhenium is not found, but ore gadolinite and molybdenite may contain a small amount of rhenium. World annual production is about 5 tons, and estimated reserves of rhenium are 3500 tons, mainly in USA, Russia and Chile.
The toxicity of rhenium is not installed. It is known, however, that it may cause irritation to eyes and skin. The liquid containing rhenium, may cause burns to skin and eyes. Inhalation of vapors of rhenium may cause respiratory irritation, including dizziness or suffocation.
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Mechanical properties of rhenium
|Limit strength tensile||1070 MPa|
|The plastic limit||290 MPa|
|The modulus of elasticity||469 GPA|
|The shear modulus||176 GPA|
|The relative tensile elongation||15…25%|
|Brinell hardness number||165|
|The Vickers hardness||170|
|Rockwell hardness, scale And||52|
|Rockwell hardness, scale In||85|
|The coefficient of thermal expansion at 5000 With||Of 6.12 µm/m°C|
|Coefficient of thermal conductivity||39, 6 W/MK|
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