What is Molybdenum Silicide?

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What is it?

Molybdenum Silicide

Molybdenum Disilicide is an organic compound with the chemical composition MoSi2. It is a grey metallic solid. Although insoluble in most acids it is soluble in nitric acid and hydrofluoric acid. The radii of these two atoms do not differ much, and their electronegativities are very close. They also have properties that are similar to metals and ceramics. Molybdenum Disilicide can be used as an electrically conducting material. A passivation layer made of silicon dioxide can also be created on the surface at high temperatures to prevent further oxidation. It is used to make high-temperature antioxidation coating materials, integrated electrode film, structural materials and reinforcing agents in composite materials.

Molybdenum Siicide:

MoSi2 (intermediate phase) is the most silicon-rich in the Mo-Si binary alloy system. It’s a Dalton type intermetallic compound of fixed composition. This high-temperature material has great performance because of its dual properties of metal and ceramic. Excellent high temperature resistance to oxidation, it has a oxidation resistant temperature of 1600. This is equivalent in SiC. It also has a moderate density (6.24g/cm3), low thermal expansion coefficient (8.10-6K-1), good electrical conductivity, high brittle-ductile temperature (1000 ) and is below ceramic-like hardbrittleness. It is soft and plastic-like metal above 1000. MoSi can be used in integrated circuits, heating elements and high temperature antioxidation coatings.

MoSi2 consists of silicon and molybdenum bonded with metal bonds. In MoSi2, silicon and silicon are also bonded via covalent bonds. Molybdenum Disilicide is a gray tetragonal crystalline. It is insoluble within common mineral acids (including aqua regia), however, it is soluble in mixed acid of nitric and hydrofluoric acids. It can be used to heat elements in high-temperature (1700) environments due to its high resistance to high-temperature oxygenation.

An oxidizing atmosphere forms a protective layer on the dense quartz (SiO2) surface. This prevents continuous oxidation and oxidation prevention of molybdenum disilicide. SiO2 fused at 1710degC to form molten droplets. It loses its protective power due to the act of expanding its surface. The oxidant acts on the element and forms a protective film. It is important to note that this element can not be used for prolonged periods in temperatures between 400 and 700 degrees C due to its strong oxidation at lower temperatures.

Molybdenum Silicide Properties

Other Titles
molybdenum disilicide (MoSi2 Powder)


Combination Formula

Molecular Weight

Gray to Black Powder

Melting Point
1900-2050 degC

Boiling Point

6.23-6.31 g/cm3

Solubility of H2O

Electrical Resistivity
0.0000270 – 0.0000370 ohm-cm

Specific heat
0.437 J/g-degC (23 degC)

Tensile Strength
185 MPa

Thermal Conductivity
66.2 W/m-K (23 degC)

Thermal Expansion

Vickers Hardness

Young’s Modulus


Molybdenum Silicon MoSi2 MoPowder CAS 12136-876-6

Molybdenum Silicide:

Molybdenum disilicide can be used in high-temperature anti-oxidation coatings, electric heating elements and integrated electrode films.

  1. Energy chemical industry: Electric heating elements, high heat exchangers of nuclear reactor devices, gas burners. High temperature thermocouples with their protective tubes. Melting vessels and crucibles are used to melt sodium, lithium and other metals.
  2. MoSi2 and other reactive metal silicides, such as WSi2, TaSi2, Ti5Si3, WSi2, TaSi2, etc. are used in the microelectronics sector. are key candidate materials for large-scale integrated gate and interconnect film production.
  3. Aerospace industry. It has been extensively and thoroughly researched and successfully applied as a high temperature antioxidation coating material. This material is especially useful for components of turbine engines such as blades or impellers.
  4. Automobile industry: engine parts, turbocharger rotors and valve bodies for automobiles.

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Tech Co., Ltd. () is a professional

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