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Black silicon carbide is produced at high temperature in an electric resistance type furnace with quartz sand and petroleum coke as its main raw materials. Its hardness is between fused alumina and synthetic diamond. The mechanical intensity of it is higher than that of fused alumina. It is brittle and sharp and has electrical and heat conductivity in some degree. Black silicon carbide is suitable for grinding cast iron, non-ferrous metal, leather, rubber, wood, rock, it also be used as high grade refractory material.
Chemical Composition (%)
(GB/T2480-1996)
|
grit |
SiC |
F.C. |
Fe2O3 |
|
F12~F90 |
≥98.50 |
<0.20 |
≤0.60 |
|
F100~F150 |
≥98.00 |
<0.30 |
≤0.80 |
|
F180~F220 |
≥97.00 |
<0.30 |
≤1.20 |
|
F230~F400 |
≥96.00 |
<0.40 |
≤1.20 |
|
F500~F800 |
≥95.00 |
<0.40 |
≤1.20 |
|
F1000~F1200 |
≥93.00 |
<0.50 |
≤1.20 |
|
P12~P90 |
≥98.50 |
<0.20 |
≤0.60 |
|
P100~P150 |
≥98.00 |
<0.30 |
≤0.80 |
|
P180~P220 |
≥97.00 |
<0.30 |
≤1.20 |
|
P230~P500 |
≥96.00 |
<0.40 |
≤1.20 |
|
P600~P1500 |
≥95.00 |
<0.40 |
≤1.20 |
|
P2000~P2500 |
≥93.00 |
<0.50 |
≤1.20 |
Physical Characteristics
|
Item |
Black silicon carbide |
Green silicon carbide |
|
Basic mineral |
α-SIC |
α-SIC |
|
Crystal system |
hexagonal |
hexagonal |
|
Crystal color |
Black |
Green |
|
Density |
≥3.12g/cm3 |
≥3.18/cm3 |
|
Mohs hardness |
9.15 |
9.15 |
|
Micro hardness |
HV3100-3280 |
HV3200-3400 |
|
Grinding ability
(compared with diamond as one) |
0.25 |
0.28 |
|
Liner expansion coefficient when |
4.4 |
4.6 |
|
Electrical resistivity |
3x105-3x107Ω.cm |
3x105-3x107Ω.cm |
Green Silicon Carbide
Black Silicon Carbide
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