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Molybdenum Disilicide

What Is Molybdenum Disilicide?

Molybdenum disilicide (MoSi2) is an attractive high-melting intermetallic compounds. This is because it has several very desirable properties, such as medium density (6.24g · cm-3), melting point (2030 ℃), low thermal expansion coefficient (8.1 × 10-6), oxidation resistance and chemical inertness, in particular, it ranks high temperature oxidation resistance silicide of the crown, and SiC and Si3N4 can be comparable. This excellent performance system automatically generated from a protective film Si recognized; the latter at high temperature and an oxidizing atmosphere to form, it is a non-spalling oxide, while when the temperature is higher than 9000C, molybdenum disilicide (MoSi2) surface of the SiO2 film is formed , lends itself to high temperatures and thermal cycling to obtain protection, and automatic generation of the cracks in the SiO2, to obtain co-operation with the self-healing.

Molybdenum disilicide (MoSi2) very versatile.

The first is used as a heating element resistance furnace until 1800 ℃ is still used as a metal conductor;

molybdenum alloySecondly molybdenum disilicide (MoSi2) film used as a gate silicon IC contacts; thick film coating was used for high-temperature (1500 ℃) antioxidant protective materials.

Future molybdenum disilicide (MoSi2) will serve as a high-temperature structures such as turbine blade materials, great development potential. Molybdenum disilicide (MoSi2) the structure and properties vary depending on its chemical composition, density, etc. (they are subject to reaction conditions, such as temperature, pressure and other control).

High-purity molybdenum disilicide (MoSi2) usually with high purity silicon metal in contact with the molten key prepared. Studies have shown that high purity oxygen gas protection measures such as raw materials and the production of molybdenum disilicide (MoSi2), its ductile-brittle transition temperature can be increased to 1300 ~ 1400 ℃, room temperature toughness also improved, showing molybdenum disilicide (MoSi2) Inclusion was 510. Removal of high performance molybdenum disilicide (MoSi2) development is essential.

Using common method to produce metallurgical molybdenum disilicide (MoSi2), the drawback is the segregation of coarse grains and ingredients, so the production of molybdenum disilicide (MoSi2) is the primary means of powder metallurgy. This process is far more mature, but many links, high temperature for a long time, oxygen pollution. To do this, add a small amount in the toner material can be improved molybdenum disilicide (MoSi2) the fracture toughness and hardness. Deoxygenation of which are:

SiO2+3C——>SiC+2CO

SHS, also known as combustion synthesis, is nearly 20 years to develop a new process materials synthesis. It is the use of exothermic heat of reaction to sustain itself. The process has the advantage of simple technology, high purity, energy conservation and efficiency, the former Soviet Union has entered the stage of industrial application.

For the preparation of molybdenum disilicide (MoSi2), the key to the first metal powder and silica compound are measured at sufficiently mixed, then the local ignition SHS reaction initiator, the reaction heat generated to maintain the rest of the synthesis reaction. If it is the pressing, casting and other technology, can directly produce dense molybdenum disilicide (MoSi2) materials, the synthesis of intermetallic compounds have great potential advantages made​​. United States in recent years has been the use of the technology as well as heat diffusion technology developed for high-performance structural materials, molybdenum disilicide (MoSi2) composite materials.

If you have any interest in our molybdenum disilicide or other molybdenum alloy products, please feel free to contact us by email: sales@chinatungsten.com,sales@xiamentungsten.com or by telephone:86 592 512 9696.

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