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What is molybdenum Silicide?
This gray metallic solid is an inorganic chemical compound with the formula MoSi2. It is insoluble, except in nitric or hydrofluoric acids. The two atoms have similar radii, a close electronegativity, and properties that are similar to those of ceramics and metals. It is electrically conductible and forms an oxidation-resistant silica passivation film on its surface at high temperature. 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 a direct reaction between two elements, Mo or Si. Reaction formula
Molybdenum Silicide: Physicochemical Properties
MoSi2 (also known as Dalton intermetallic compound) is the intermediate phase in the Mo-Si binary system with the highest silicon contents. It is both a metal and a ceramic, and has exemplary performance at high temperatures. 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 primarily as a heating component, integrated circuits, high temperature anti-oxidation coats, and high temperature structural materials.
MoSi2 has molybdenum bonded with silicon via metallic bonds while silicon is covalently attached to silicon. It is not soluble 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 layer, thickening to 1710 degrees melting point, and SiO2 fuse into 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 the high oxidation of the element at low temperatures, it cannot be used in the range 400-700degC for a prolonged period.
Applications of molybdenum Silicide
In the following industries, molybdenum silicide is used as a high-temperature coating material, an electric heating element, integrated electrode films and structural materials. It can also be found in reinforcing materials for composite materials, wearing-resistant materials and joining materials for structural ceramics.
1) Energy industry and chemical industry: high-temperature thermocouples and their protective tubes, melting vessel vessels (for melting sodium and lithium, lead and bismuth), melting vessel crucibles.
2) Microelectronics Industry: MoSi2 & other refractory metallic silicides (Ti5Si3, TaSi2, TaSi2, TaSi3, etc.) These films are ideal for interconnecting lines and large-scale circuits.
(3) Aerospace industry: The material has been extensively researched and is used as an anti-oxidation high-temperature coat. 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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