Density and specific heat of cobalt and cobalt alloys
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The atomic number 27 is cobalt periodic table of the elements between iron and Nickel. Known artificial isotope cobalt-60. The density of cobalt is 8800 kg /cm3, and its thermal expansion coefficient lies between the corresponding values for iron and Nickel. At temperatures below 417 °C, cobalt has a hexagonal close-Packed structure. Between 417 °C and a melting point of 1493 °C, cobalt has a face-centered cubic structure.
The elastic modulus of cobalt is about 210 GPA (tensile) and about 183 GPA under compression.
Cobalt is naturally ferromagnetic material, and provides resistance to demagnetization several groups of alloys used in permanent magnets.
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The use of cobalt in the modern business activities
Cobalt is used:
- In the manufacture of pigments;
- As a component of hard alloys;
- For the manufacture of magnetic materials;
- In the production of artificial sources of γ-radiation;
As alloys based on cobalt is usually produced with a wear-resistant, corrosion-resistant and heat-resistant (even at high temperatures). These properties of the alloys arise from the crystallographic nature of cobalt (in particular its response to stress) influence of hardening of solid solutions of chromium, tungsten and molybdenum.
As a rule, the softer and tougher compositions are used for high temperature applications, in particular, the production of gas turbine blades. Firmer varieties — stellites — used in the manufacture of carbide tooling. The main difference is the high content of carbon and tungsten (including the amount and type of carbide in the microstructure). The contents of carbon and tungsten affect the hardness, ductility, and resistance to abrasive wear.
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