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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 acid. The two atoms have similar radii, the electronegativity and properties are close. 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 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 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 heating element temperature exceeds 1700 degrees, SiO2 protective films are formed, thickening to a melting point 1710 and fusion of SiO2 into molten droplets. 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 strong oxidation, the element can’t be used at temperatures between 400 and 700degC for long periods of time.
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.
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, TaSi2, TiSi3, etc.) These films are ideal for interconnecting lines and large-scale circuits.
It has been extensively and deeply investigated and applied in the aerospace industry as a coating material for high temperature anti-oxidation. Specially for turbine engine parts, including blades, impellers combustors tailpipes and sealing devices.
Automotive Industry (4): Turbo engine supercharger, valve body and spark plug for automobiles.
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