On the Periodic Table of Element, molybdenum is designated by the symbol Mo. It is also number 42 among Group number 6 members of the Periodic Table. It has a few properties that make it unique. They include the following:
· Elasticity - Its young modulus (Longitudinal Strain) is 329 GPa, rigidity modulus (alteration of shape due to tangential stress) is 20 GPa and bulk modulus (inverse of compressibility)
· Electrical - Molybdenum is known to have electrical resistivity of 5.5*10-8 Ω m.
· Hardness - Moly’s mineral hardness on Moh Scale is 5.5. Since the scale ranges from 1 to 10, molybdenum hardness is rather high compared to the hardness of other metals like iron. It has the ability to scratch many other metals classed lower than itself on the Moh scale.
· Temperature - Mo has a melting point of 2623 degrees Celsius and a boiling point of 4912 degrees Celsius.
· Density - Molybdenum density is 10280 kg/m3.
Moly is not easily recognizable as it resembles copper and aluminum. It is a grayish-white metal with a silvery finish. Molybdenum material was used in steel alloys during the First World War as a substitute for tungsten which was scarce then. Again its popularity went down until the Second World War began. The reason why Mo is preferred as an alloying agent is because of its durability, corrosion resistance, extreme temperature resistance and physical strength.
Superalloys that contain molybdenum include nickel based alloys. They are grouped into two: corrosion resistant alloys and high temperature alloys. The latter can be divided further into age-hardenable and solid-solution strengthened. In corrosion-proof nickel-based alloys kept in non-oxidizing surroundings, molybdenum increases their safety in sulfuric acid and halide acids. Moly can also protect against serious corrosion attacks, such as crevice corrosion and pitting when combined with chromium. Good examples of nickel-based alloys that are corrosion-proof in non-oxidizing conditions include C-22, B-3 and C-2000.
These nickel-based molybdenum alloys have many applications in the pharmaceutical industries, petrochemical and pollution control factories and chemical processing industries among others. When moly is used in high-temperature alloys, it protects the alloys from heat damage. It particularly circulates gradually in nickel for solid-solution strengthened alloys. In the age-hardenable alloys that use gamma-prime precipitation, Mo is added to strengthen and minimize lattice variance. Of all moly alloys, steel alloys tolerate the highest temperature quantities and pressures. Because of this property, molybdenum is used in the constructions of jet engines and wrought car components. Also construction and durability of molybdenum wires, electrodes, and tubes depend on its resilience and strength. It can also be shaped into rods, discs, plates, screws, nuts and many other small molybdenum parts.
By Stanford Materials http://stanfordmaterials.com
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