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Cobalt and Silver – Comparison – Properties

This article contains comparison of key thermal and atomic properties of cobalt and silver, two comparable chemical elements from the periodic table. It also contains basic descriptions and applications of both elements. Cobalt vs Silver.

cobalt and silver - comparison

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Cobalt and Silver – About Elements

Cobalt

Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.

Silver

Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining.

Cobalt in Periodic Table

Silver in Periodic Table

Source: www.luciteria.com

Cobalt and Silver – Applications

Cobalt

Cobalt has been used in many industrial, commercial, and military applications. Cobalt is primarily used in lithium-ion batteries, and in the manufacture of magnetic, wear-resistant and high-strength alloys. Cobalt-based Superalloys. This class of alloys is relatively new. In 2006, Sato et al. discovered a new phase in the Co–Al–W system. Unlike other superalloys, cobalt-base alloys are characterized by a solid-solution-strengthened austenitic (fcc) matrix in which a small quantity of carbide is distributed. While not used commercially to the extent of Ni-based superalloys, alloying elements found in research Co-based alloys are C, Cr, W, Ni, Ti, Al, Ir, and Ta. They possess better weldability and thermal fatigue resistance as compared to nickel based alloy. Moreover, they have excellent corrosion resistance at high temperatures (980-1100 °C) because of their higher chromium contents. Several cobalt compounds are oxidation catalysts. Typical catalysts are the cobalt carboxylates (known as cobalt soaps). They are also used in paints, varnishes, and inks as “drying agents” through the oxidation of drying oils.

Silver

Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes alongside gold. Silver has many important, far-reaching technological and electronic applications. It’s used in everything from cell phones, computers and semiconductors to automobiles, water-purification systems and—because it is the best conductor of heat of all elements—spacecraft solar radiation tiles. Silver is of the upmost importance in photography (where approximately 30% of the U.S. Industrial consumption goes into this application). The medical uses of silver include its use in wound dressings, creams, and as an antibiotic coating on medical devices. Wound dressings containing silver sulfadiazine or silver nanomaterials may be used on external infections.

Cobalt and Silver – Comparison in Table

Element Cobalt Silver
Density 8.9 g/cm3 10.49 g/cm3
Ultimate Tensile Strength 800 MPa 110 MPa
Yield Strength 220 MPa 45 MPa
Young’s Modulus of Elasticity 209 GPa 83 GPa
Mohs Scale 5 3.25
Brinell Hardness 800 MPa 210 MPa
Vickers Hardness 1040 MPa 251
Melting Point 1495 °C 961.78 °C
Boiling Point 2927 °C 2162 °C
Thermal Conductivity 100 W/mK 430 W/mK
Thermal Expansion Coefficient 13 µm/mK 18.9 µm/mK
Specific Heat 0.42 J/g K 0.235 J/g K
Heat of Fusion 16.19 kJ/mol 11.3 kJ/mol
Heat of Vaporization 376.5 kJ/mol 250.58 kJ/mol