What is molybdenum silicide and its properties?


Aug 15, 2023

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What is molybdenum Silicide? Molybdenum Silicide This gray metallic solid is an inorganic chemical compound 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 can also be made by the direct reaction between two elements, Mo & Si. Reaction formula
Molybdenum Silicide: Physicochemical Properties
MoSi2 (also known as Dalton type intermetallic compound) is the intermediate phase in the MoSi binary alloy with the highest silicon contents. It combines the best of metal and ceramic, and has an 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 by metallic bond to silicon, while silicon is covalently bound 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 heating element temperature exceeds 1700 degrees, the SiO2 protective films are formed, thickening up to 1710 degrees and fusion of SiO2 into molten drops. Surface extension causes the loss of protective capability. It is possible to form a protective layer again when an element is continuously exposed to oxidizing agents. Due to a strong oxidation occurring at low temperatures, it is important to note that the element cannot remain in use for a prolonged period of time within the temperature range 400-700degC.

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 and chemical industries: high-temperature thermocouples (and their protection tubes), 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.
The material has been extensively and deeply studied and applied in the aerospace industry as an anti-oxidation high-temperature coating. Specially for turbine engine parts, including blades, impellers combustors tailpipes and sealing devices.
Automotive Industry: Turbo engine supercharger, valve body and spark plug for automobiles.

(aka. Technology Co. Ltd. has over 12 years experience as a supplier and manufacturer of high-quality chemical materials. The Molybdenum Silicide Please note that the products produced by our company are of high purity and have low impurities. Please. Contact us if necessary.