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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, the electronegativity and properties are close. It is electrically conductible and forms an oxidation-resistant silica passivation film on the surface of molybdenum silicide 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 the direct reaction between two elements, Mo & Si. Reaction formula
MoSi2 (also known as Dalton type intermetallic compound) is the intermediate phase in the MoSi binary alloy with the highest silicon contents. It combines both the metal and ceramic properties 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 with silicon via metallic bonds while silicon is bonded covalently 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 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 used continuously with an oxidizing substance. Due to strong oxidation, the element can’t be used at temperatures between 400 and 700degC for a prolonged period of time.
Applications of molybdenum Silicide
In the following industries, molybdenum silicide is used as a high-temperature coating material, an electric heating element, an integrated electrode film and structural materials. It can also be found in composite materials that are reinforced, materials resistant to wear, materials for joining structural ceramics etc.
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, TaSi2, TiSi3, etc.) These films are ideal for interconnecting lines and large-scale circuit gates.
(3) Aerospace Industry: It is extensively researched and widely used as anti-oxidation high temperature coating material. Specially for turbine engine parts, including blades, impellers combustors tailpipes and sealing devices.
(4) Automotive: 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 impurity. Please. Contact us if necessary.
Preparation and use of molybdenum Silicide
MoSi2 is formed by the direct reaction between two elements, Mo & Si. Reaction formula
Mo+2Si-MoSi2
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 both the metal and ceramic properties 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 with silicon via metallic bonds while silicon is bonded covalently 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 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 used continuously with an oxidizing substance. Due to strong oxidation, the element can’t be used at temperatures between 400 and 700degC for a prolonged period of time.
Applications of molybdenum Silicide
In the following industries, molybdenum silicide is used as a high-temperature coating material, an electric heating element, an integrated electrode film and structural materials. It can also be found in composite materials that are reinforced, materials resistant to wear, materials for joining structural ceramics etc.
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, TaSi2, TiSi3, etc.) These films are ideal for interconnecting lines and large-scale circuit gates.
(3) Aerospace Industry: It is extensively researched and widely used as anti-oxidation high temperature coating material. Specially for turbine engine parts, including blades, impellers combustors tailpipes and sealing devices.
(4) Automotive: 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 impurity. Please. Contact us if necessary.