What is molybdenum silicide and its properties?

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What is molybdenum Silicide? Molybdenum Silicide This gray metallic solid is a compound inorganic with the formula MoSi2. It is insoluble, except in nitric or hydrofluoric acid. The two atoms have similar radii, an electronegativity that is not too far apart, and properties that are close to those of ceramics and metals. It is electrically conductible and forms an oxidation-resistant silica passivation film on the surface of molybdenum silicide at high temperatures. It can be used for high-temperature coatings, electric heating components, integrated electrode film, structural materials and as reinforcing agent for composite materials.

Preparation and use of molybdenum Silicide
MoSi2 can also be made by the direct reaction between Mo and Si. Reaction formula
Molybdenum Silicide: Physicochemical Properties
MoSi2 (also known as Dalton type intermetallic compound) is the intermediate phase in the MoSi binary alloy with the highest silicon contents. It has the characteristics both of metal and a ceramic, and it is a material with high temperatures and excellent performance. It has a good high-temperature resistance to oxidation, with an oxidation temperature above 1600 that is comparable to SiC. It also has a moderate density (6.24g/cm3), a low coefficient of thermal contraction (8.1×10-6K-1), good electrical and thermal conduction, and brittle transition temperatures (1000) just below ceramic-like hardness. MoSi can be used as an anti-oxidation coating for high temperatures, high temperature structural materials, integrated circuits, and heating elements.
MoSi2 has molybdenum bonded to the silicon by metallic bond, while silicon is covalently bound to the silicon. It is insoluble with mineral acids, including aqua regia. However, it is soluble with a mixture containing nitric and hydrofluoric acids.
In an oxidizing environment, dense quartz glass (SiO2) is formed on the surface of the molybdenum silicide to protect it from continuous oxidation. When the temperature of heating element is greater than 1700 degrees, SiO2 protective films are formed, thickening up to 1710 melting points, and SiO2 fusion as molten drops. Surface extension causes the loss of protective capability. It is possible to form a protective layer again when an element is used continuously with an oxidizing substance. Due to strong oxidation, the element can’t be used at temperatures between 400 and 700degC for a prolonged period of time.

Applications of molybdenum Silicide
In the following industries, molybdenum silicide is used as a high-temperature coating material, an electric heating element, an integrated electrode film and structural materials. It can also be found in composite materials to reinforce them, in wear-resistant materials or in joining materials.
1) Energy and chemical industries: high-temperature thermocouples and their protective tubes, melting vessel vessels (for melting sodium and lithium, bismuth and tin), high-temperature thermocouples and gas burners.
2) Microelectronics Industry: MoSi2 & other refractory metallic silicides (Ti5Si3, TaSi2, TaSi2, TaSi2, TiSi2, TaSi2, TaSi2, TaSi2, TaSi2, TaSi2, TaSi2, TaSi2, TaSI2, etc.) These films are ideal for interconnecting lines and large-scale circuit gates.
Aerospace industry (3): This material has been extensively and deeply investigated and used for high temperature anti-oxidation coatings. Specially for turbine engine parts, including blades, impellers combustors tailpipes and sealing devices.
Automotive industry: turbocharger supercharger rotors and valve bodies for automobiles.

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