What is Molybdenum Silicide?
is an inorganic compound with the chemical formula MoSi2, which is a gray metallic solid. Molybdenum silicide is insoluble in most acids, but soluble in nitric acid and hydrofluoric acid. The radii of its two kinds of atoms are not much different, the electronegativity is relatively close, and it has properties similar to metals and ceramics. Molybdenum silicide is conductive and can form a passivation layer of silicon dioxide on the surface at high temperatures to prevent further oxidation. It is used in the fields of high-temperature anti-oxidation coating materials, electric heating elements, integrated electrode films, structural materials, composite material reinforcements, wear-resistant materials, and structural ceramic connecting materials.
Molybdenum silicide properties
is an intermediate phase with the highest silicon content in the Mo-Si binary alloy system. It is a Dalton-type intermetallic compound with a fixed composition. Molybdenum silicide has the dual characteristics of metal and ceramics and is a high-temperature material with excellent performance. It has good high-temperature oxidation resistance, and the oxidation resistance temperature is as high as 1600℃, which is equivalent to SiC. It has a moderate density (6.24g/cm3), a low coefficient of thermal expansion (8.1×10-6K-1), and good electrical and thermal conductivity. Molybdenum silicide exhibits metallic soft plasticity above 1000°C. MoSi is mainly used as heating elements, integrated circuits, high-temperature anti-oxidation coatings, and high-temperature structural materials.
In molybdenum silicide, molybdenum and silicon are connected by a metal bond and silicon and silicon are connected by a covalent bond. Molybdenum silicide is a gray tetragonal crystal. Molybdenum silicide is insoluble in general mineral acids including aqua regia but it is soluble in a mixed acid of nitric acid and hydrofluoric acid. Molybdenum silicide has good high-temperature oxidation resistance and can be used as a heating element working in a high-temperature (<1700°C) oxidizing atmosphere.
In an oxidizing atmosphere, a protective film is formed on the surface of the dense quartz glass (SiO2) that burns at a high temperature to prevent continuous oxidation of Molybdenum silicide. When the temperature of the heating element is higher than 1700°C, a SiO2 protective film is formed. Due to the action of extending the surface, it loses its protective ability. Under the action of the oxidant, when the element is used continuously, it forms a protective film again. It should be noted that due to the strong oxidation at low temperatures, this element cannot be used for a long time in the temperature environment of 400-700°C.
Molybdenum silicide applications
Molybdenum silicide is used in the fields of high-temperature oxidation-resistant coating materials, electric heating elements, integrated electrode films, structural materials, composite material reinforcements, wear-resistant materials, and structural ceramic connection materials, and is distributed in the following industries:
1. Energy and chemical industry. Molybdenum silicide can be used as electric heating elements, high-temperature heat exchangers of atomic reactor devices, gas burners, high-temperature thermocouples, and their protection tubes, smelting vessels, and crucibles (used for smelting sodium, lithium, lead, bismuth), Tin, and other metals).
2. Microelectronics industry. MoSi2 and other refractory metal silicides Ti5Si3, WSi2, TaSi2, etc. are important candidates for large-scale integrated circuit gates and interconnection films.
3. Aerospace industry. As a high-temperature anti-oxidation coating material, it has been widely and in-depth research and application. Especially as a material for turbine engine components, such as blades, impellers, combustors, nozzles, and sealing devices.
4. Automobile industry. Turbocharger rotors, valve bodies, spark plugs, and engine parts for automobiles.
Molybdenum Silicide Supplier
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