Silicon Carbide Properties
Silicon Carbide is also called carborundum, a black (and green) hex crystal which is extremely
hard and sharp with excellent physical and chemical properties.
Physical Properties:
Hardness is in the range between diamond and fused alumina (micro hardness
2840-3320kg/mm², Mohs 9.5). Silicon Carbide offers good heat-resistance, heat-conductibility,
aseismatic properties, very high wear resistance and has low dilatability. It is also a semi
conductor with non-linear electrical resistance.
Chemical Properties:
Silicon Carbide is quite stable chemically. It can be antacid and antalkali, will not react with fuming
nitric acid, boiling sulphuric, hydrochloric or hydrofluoric acid. Sodium silicate attacks it above
1300ºC, calcium and magnesium oxides attack above 1000ºC and Copper oxide reacts at 800ºC
to form a metal silicide. Slow oxidation occurs in air above 1000ºC. Silicon Carbide also dissociates
or sublimates in molten iron and the silicon reacts with the metal oxides in the melt whist
Chemical
Analysis
the carbonprovides exothermic
energy
to the furnace.
Element
T
Free Carbon
SiO2
Other
5.0
2.0
9.9
cal %
Min %
Max%
These
ideal material already used in a wealth of
SiC unique properties
85 of Silicon Carbide
80 make it an88
industrial applications today. Tomorrow has infinite possibilities.
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