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What Are The Functional Silicides?

wallpapers Environment 2020-12-04
Some metals (such as lithium, calcium, magnesium, iron, chromium, etc.) and certain non-metals (such as boron, etc.) and silicon form binary compounds. It is generally crystal, with metallic luster, hard and high melting point. One kind of metal or non-metal can generate many kinds of silicides. Such as iron can produce FeSi, FeSi2, Fe2Si5, Fe3Si2, Fe5Si3 and so on. It can be obtained by reducing metal (or non-metal) oxide or metal silicate with silicon in an electric furnace. Metal silicides are widely used for their excellent high-temperature oxidation resistance, electrical conductivity and heat transfer.
 
Functional silicide
 
Silicide for electric heating elements: Metal silicide as an electric heating element is one of its earliest applications. Generally, the lower the silicon content in the metal silicide, the higher the melting point, but its oxidation resistance decreases. Therefore, disilicides with low melting point but good oxidation resistance are usually used to make heating elements.
 

Silicides for high-temperature oxidation-resistant coatings: The remarkable oxidation resistance and self-healing properties of MoSi2 coatings on molybdenum have led to extensive research on a large number of other MeSi2 binary silicides and more complex silicides for all refractory metals Its alloys and graphite materials include anti-oxidation coatings of carbon/carbon composite materials.
 
It is known that the thickness of the coating has a parabolic relationship with the time of use, and the effect of temperature on the thickness of the coating is more sensitive than time. Further research found that the life of the silicide coating is mainly controlled by the interdiffusion ability of elements in the coating system and coating defects. In this regard, at present, one is to modify the coating silicide through alloying to obtain a multi-element composite oxide protective film with better oxidation resistance; the other is to use gradient composite to improve the coating produced during thermal cycling. The hair-like crack defect.

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