Briefly Introduce Applications of molybdenum
Time 2011-02-15 Author Website Manager Browse
QQmessage 
Tel：0086-371-55611696
Tel：0086-371-55611696
A molybdenum disilicide heating element
Alloys
The ability of molybdenum to withstand extreme temperatures without significantly expanding or softening makes it useful in applications that involve intense heat, including the manufacture of aircraft parts, electrical contacts, industrial motors and filaments.
Most high-strength steel alloys (example 41xx steels) contain 0.25% to 8% molybdenum. Despite such small portions, more than 43,000 tonnes of molybdenum are used as an alloying agent each year in stainless steels, tool steels, cast irons and high-temperature superalloys.
Molybdenum is also used in steel alloys for its high corrosion resistance and weldability. Molybdenum contributes further corrosion resistance to "chrome-moly" type-300 stainless steels (high-chromium steels that are corrosion-resistant already due to their chromium content) and especially so in the so-called superaustenitic stainless steels (such as alloy AL-6XN). Molybdenum acts by increasing lattice strain, thus increasing the energy required to dissolve out iron atoms from the surface.
Because of its lower density and more stable price, molybdenum is sometimes used instead of tungsten. An example is the 'M' series of high-speed steels such as M2, M4 and M42 as substitution for the 'T' steel series which contain tungsten. Molybdenum can be implemented both as an alloying agent and as a flame-resistant coating for other metals. Although its melting point is 2,623 °C (4,753 °F), molybdenum rapidly oxidizes at temperatures above 760 °C (1,400 °F) making it better-suited for use in vacuum environments.
TZM (Mo (~99%), Ti (~0.5%), Zr (~0.08%) and some C) is a corrosion resisting molybdenum superalloy that resists molten fluoride salts at temperatures above 1300C. It has about twice the strength of pure Mo, and is more ductile and more weldable, yet in tests it resisted corrosion of a standard eutectic salt (FLiBe) and salt vapors used in molten salt reactors for 1100 hours with so little corrosion that it was difficult to measure.
Other molybdenum-based alloys which do not contain iron have only limited applications. For example, because of the corrosion resistance against molten zinc, both pure molybdenum and the molybdenum/tungsten alloy (70%/30%) are used for piping, stirrers and pump impellers which come into contact with molten zinc.
Other applications as catalyst and compounds
•Molybdenum-99 is a parent radioisotope to the daughter radioisotope technetium-99m, which is used in many medical procedures.
•Molybdenum disulfide (MoS2) is used as a solid lubricant and a high-pressure high-temperature (HPHT) antiwear agent. It forms strong films on metallic surfaces and is a common additive to HPHT greases—in case of a catastrophic grease failure, thin layer of molybdenum prevents contact of the lubricated parts. It has also been found to have semi-conductive properties with distinct advantages over traditional silicon or graphene for use in electronics applications.
•Molybdenum disilicide (MoSi2) is an electrically conducting ceramic with primary use in heating elements operating at temperatures above 1500 °C in air.
•Molybdenum trioxide (MoO3) is used as an adhesive between enamels and metals. Lead molybdate (wulfenite) co-precipitated with lead chromate and lead sulfate is a bright-orange pigment used with ceramics and plastics.
•Molybdenum powder is used as a fertilizer for some plants, such as cauliflower.
•The element is also used in NO, NO2, NOx analyzers in power plants for pollution controls. At 350 °C (662 °F) the element acts as a catalyst for NO2/NOx to form only NO molecules for consistent readings by infrared light.
•Ammonium heptamolybdate is used in biological staining procedures.
Up page:Mining Industry in Pakistan
- Introduction of gold trommel machine
- Mill balls and water influence the effic
- Fault handling of jaw crusher
- process of Stone Aggregates produced by
- How to maintain ball mill with the lubri
- China mining machinery need technology i
- How to choose jaw crusher--let me help y
- Domestic Mining Machinery Trends brief a
- The future development trends and prospe
- The development of ball miller feeding
- Songling advise for the purchase skills
- Mining mechanization hot ascension of Mi
- The property of Flotation Machine
- The Most Important Factor in the Process
- Obvious advantages of ball mill
- Environmental Protection Idea must be st
- The Benefits of central bank cutting int
- Stone production industry promote the c
- The future of the drying equipment in Ch
- Rock Crusher Maintenance
