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MAGNESIOTHERMIC SiC PRODUCTION - Coggle Diagram
MAGNESIOTHERMIC SiC PRODUCTION
Equation
Overall: SiO2 + C + 2Mg → SiC + 2MgO
silica is reduced to silicon via the MR in
which Mg acts as a reductant
The obtained silicon reacts with carbon to form crystalline SiC in virtue of massive exothermic energy from MR
Preparation
The mixture was added by sulfuric acid and distilled water at 100 °C for 6 h and 160 °C for the other 6 h
The dried powder was then carbonated at 700 °C for an hour using an argon gas furnace.
2 g crystalline silica was mixed with a 1.14 g sucrose.
The magnesiothermic process was controlled for
18 h.
The as-prepared silicon carbide product was then leached by hydrofluoric acid (10 wt%) and nitric acid (4 M) for 3 h on a hotplate with stirring speed of 600 rpm and temperature of 100 °C.
Introduction
Magnesium was introduced to the silica/carbon composite in an
argon gas furnace
Magnesiothermic reduction can break silica chemical bonding at lower
temperatures
sources of silica to prepare silicon carbide: tetraethyl
orthosilicate, polycarbosilane, resorcinol formaldehyde, or any materials containing silicon and carbon. Natural limestone-crystalline silica
Silicon carbide can be fabricated by sintering at a very high temperature to form a compact
ceramic.
Application
Gas sensors
Optical devices
Optoelectronic devices
Li-ion batteries
Advantages
produce silicon structures from silica in the temperature range of 500–950 °C, permitting template assisted design of silicon structures.
produce porous silicon materials at lower temperatures
