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 ceramics. 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. Above 1000, MoSi is soft and plastic-like metal. 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 easily soluble in mixed acids containing nitric acid or hydrofluoric acid. 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 surface dense quartz glass (SiO2) that has been heated to high temperatures. This prevents continuous oxidation. SiO2 fused to form protective films when temperatures exceed 1700degC. It loses its protective power due to the act of expanding its surface. The oxidant acts on the element and forms a protective film. This element can not be used for prolonged periods in temperatures between 400 and 700 degrees C due to its strong oxidation at low temperatures.
|Molybdenum Silicide Properties|
|Other Titles||molybdenum disilicide (MoSi2 Powder)|
|Appearance||Gray to Black Powder|
|Melting Point||1900-2050 degC|
|Solubility of H2O||N/A|
|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)|
Molybdenum disilicide can be used in high-temperature anti-oxidation coatings, electric heating elements and integrated electrode films.
- 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 lead.
- MoSi2 and other reactive metal silicides, such as WSi2, TaSi2, Ti5Si3, WSi2, TaSi2, and others are used in the microelectronics sector. important candidates materials for large-scale integrated circuit gates and interconnect films.
- 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.
- Automobile industry: engine parts, turbocharger rotors and valve bodies for automobiles.
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