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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, and their electronegativity is very close. This material has properties that are similar to those of ceramics and metals. It is electrically conductible and forms an oxidation-resistant silica layer 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 is formed by a direct reaction between two elements, Mo & Si. Reaction formula
Molybdenum Silicide: Physicochemical Properties
MoSi2 (also known as Dalton intermetallic compound) is the intermediate phase in the MoSi binary alloy with the highest silicon contents. It is both a metal and a ceramic, and has excellent high-temperature 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, a heating element and structural material.
MoSi2 has molybdenum bonded with silicon via metallic bonds while silicon is bonded covalently to silicon. It is insoluble with mineral acids, including aqua regia. However, it is soluble with a mixture nitric and hydrofluoric acids and exhibits good resistance to high temperature oxidation.
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 and melting at 1710 degrees, and SiO2 fusion to form 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, joining materials in structural ceramics etc.
1) Energy and chemical industries: 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: 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.
(4) Automotive: supercharger rotor for turbo engines, valve body, ignition plug, and other engine parts.
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Molybdenum Silicide
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