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 fused alumina. It is brittle and sharp and has electrical and heat conductivity in some degree. The abrasives made of it are suitable for working on cast iron, non-ferrous metal, rock, leather, rubber, etc. It is also broadly used as refractory material and metallurgical additive.
Type value of black silicon carbide physical chemical performance index
Type | Grit | Chemical composition（%） | Magnetic contents (%) | Range of bulk density (g/cm3） | ||
SiC | F.C | Fe2O3 | ||||
Ｃ | F46 | 99.23 | 0.10 | 0.12 | 0.0107 | 1.51 |
F120 | 99.28 | 0.13 | 0.08 | 0.0090 | 1.41 | |
F180 | 98.87 | 0.12 | 0.19 | 0.0089 | 1.34 | |
F360 | 98.45 | 0.15 | 0.19 | 0.0098 | 1.29 | |
Ｃ－Ｂ Ｃ－Ｐ | F46 P40 | 98.86 | 0.16 | 0.16 | 0.0150 | 1.45 |
F120 P120 | 98.93 | 0.17 | 0.16 | 0.0119 | 1.40 | |
F180 P180 | 98.31 | 0.19 | 0.23 | 0.0094 | 1.30 | |
F360 P600 | 98.21 | 0.15 | 0.18 | 0.0108 | 1.27 | |
For vitrified bonded wheelabrasives belts:
For organic wheels: C-B
For sheets: C-P
Black Silicon Carbide Chemical Composition ;Magnetic ;Contents of China GB/T2480-1996
GB/T 2480-1996 | Chemical Composition(%,by weight) | Magnetic contents | ||||
Type | Grit size | SiC ≥ | F.C ≤ | Fe2O3 ≤ | Grit size | Magnetic contents (%) ≤ |
C | F12~F90 | 98.50 | 0.20 | 0.60 | F16-F30 P12-P30 | 0.030 |
F100~F150 | 98.00 | 0.30 | 0.80 | F36-F60 P36-P60 | 0.025 | |
F180~F220 | 97.00 | 0.30 | 1.20 | F70-F120 P80-P150 | 0.020 | |
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| F150-F220 P180-P220 | 0.015 | |
C-B | F12~F90 | 98.00 | 0.25 | 0.70 | F16-F30 P12-P30 | 0.075 |
F100~F150 | 97.50 | 0.35 | 0.90 | F36-F60 P36-P60 | 0.065 | |
F180~F220 | 96.00 | 0.35 | 1.35 | F70-F120 P80-P150 | 0.055 | |
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| F150-F220 P180-P220 | 0.035 | |
Reference chemical composition of silicon carbide of non-abrasives application:
Type | Reference chemical composition (%) | Size(mm)
| ||
SiC | F.C. | Fe2O3 | ||
SiC98 | ≥98.00 | <1.00< p=""> | <0.50< p=""> | 10~0 6~3 3~1 1~0 100F 200F 325F 1200F |
SiC97 | ≥97.00 | <1.50< p=""> | <0.80< p=""> | |
SiC95 | ≥95.00 | <2.50< p=""> | <1.00< p=""> | |
SiC90 | ≥90.00 | <3.00< p=""> | <2.50< p=""> | |
SiC88 | ≥88.00 | <3.50< p=""> | <3.00< p=""> | |
SiC85 | ≥85.00 | <5.00< p=""> | <3.50< p=""> | |
SiC60 | ≥60.00 | <12.00< p=""> | <3.50< p=""> | |
SiC50 | ≥50.00 | <15.00< p=""> | <3.50< p=""> | |
Note: Other various sizes also can be supplied.
