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Magnesiothermic of SiC (TEAM 6) - Coggle Diagram
Magnesiothermic of SiC
(TEAM 6)
chemical equation
SiO2 + C +2Mg → SiC + 2MgO
React at varying temperature from 700 °C to 1000 °C by argon gas furnace
magnesium underwent an exothermic reaction to create a higher temperature for the formation of silicon carbide inside the argon gas furnace
Recommendation
Use hydrofluoric acid in acid-leaching process for the complete removal of impurities such as silica and magnesium in the SiC for the prevention of decrease in conductivity
Why reducing conductivity? - presence of Mg residue on the surface of SiC tends to agglomerate the SiC particle which may trap the electrons in the valence band and inhibit the movement of electrons into the conduction band.
Source of silica to produce SiC
Tetraethyl
orthosilicate, polycarbosilane, resorcinol formaldehyde, or any materials containing silicon and carbon.
The use of crystalline silica from natural limestone as the source of silicon and
sucrose as the source of carbon are preferred.
Definition
Reduction reaction process which uses
magnesium at an elevated temperature.
The magnesium was introduced to the silica/carbon composite in an argon gas furnace.
The magnesiothermic reduction can break silica chemical bonding at lower temperatures which in turns offer better control of the building block arrangements
How does it works?
The incorporation of magnesium during heating enabled the release of silicon from silica, and its oxygen was bound by
magnesium in such a way that crystalline silica carbide was established
Process Flow
Source
Carbonization
Magnesiothermic
Reduction
Silica Carbide (SiC)
Calcination
Advantages
the magnesiothermic synthesis is more economical by virtue of the use of the natural mineral.
It requires low temperature to complete the silicon carbide fabrication.