Original
By certification 
Black Silicon Carbide (SIC) is produced in an electric resistance furnace from quartz sand and petroleum coke or anthracite at high temperature. The hardness and sharp particle shape of SIC make it suitable for producing of grinding wheels, coated abrasives, wire saws, superior refractory materials and deoxideiser as well as for lapping, polishing and blasting.
Chemical & Physical Properties | |||||||||
Crystal Form |
Alpha SiC hexagonal system |
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Chemical nature |
Slight acid |
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Reaction with acids |
Very slight surface action with hydrofluoric acid |
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Reaction with Alkalies |
Attcked at high temperature by alkalles and iron xide |
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Oxidation-reduction effects |
Starts to oxide slowly at 800oC. No reduction |
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True Density (g/cm3) |
3.20 |
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Hardness |
Knoop (kg/cm2) |
2200-2500 |
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Moh's |
9.5 |
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Color |
Black |
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Color after firing |
Black |
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Decomposition point |
2200oC |
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Max Usable temperature |
1540oC in air |
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Specific heat (cal/g.oC) |
0oC |
500oC |
1000oC |
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0.14 |
0.28 |
0.13 |
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Coefficient of thermal conductivity (cal/cm2.sec.oC) |
600oC |
800oC |
1000oC |
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0.080 |
0.061 |
0.0510 |
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Electrical resistivity (Wcm) |
25oC |
100oC |
400oC |
800oC |
1400oC |
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50 |
46.4 |
26.6 |
7.8 |
0.65 |
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Coefficient of liner expansion (x10-6) |
25oC-500oC |
25oC-1000oC |
25oC-1500oC |
25oC-2000oC |
25oC-2500oC |
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4.63 |
5.12 |
5.48 |
5.77 |
5.94 |
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Chemical Composition (by % weight) | |||||
Grit |
10# - 90# |
100# -180# |
220# - 220# |
230# - 400 # |
500#-1200# |
SiC |
98.5 min |
98.0 min |
97.0 min |
96.0 min |
93.0 min |
F.C |
0.2 max |
0.3 max |
0.3 max |
0.4 max |
0.4 max |
Fe2O3 |
0.6 max |
0.8 max |
1.2 max |
1.5 max |
1.7 max |
Available grain sizes | |||||
Grit No. |
Micron |
Grit No. |
Micron |
Grit No. |
Micron |
10 |
2360 ~ 2000 |
30 |
710 ~ 600 |
80 |
212 ~ 180 |
12 |
2000 ~ 1700 |
36 |
600 ~ 500 |
90 |
180 ~ 150 |
14 |
1700 ~ 1400 |
40 |
500 ~ 425 |
100 |
150 ~ 125 |
16 |
1400 ~ 1180 |
46 |
425 ~ 355 |
120 |
125 ~ 106 |
20 |
1180 ~ 1000 |
54 |
355 ~ 300 |
150 |
106 ~ 75 |
22 |
1000 ~ 850 |
60 |
300 ~ 250 |
180 |
90 ~ 63 |
24 |
850 ~ 710 |
70 |
250 ~ 212 |
220 |
75 ~ 53 |
Available mircron powder sizes | ||||||||
China GB 2477-83 |
JIS |
FEPA(84) / DIN(70) |
ISO(77) |
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Grit No. |
Norminal size range(µm) |
Grit No. |
ds50 value (µm) |
Grit No. |
ds50 value (µm) |
Grit No. |
ds50 value (µm) |
|
Standard werte der Mikro-F-Reihe |
Sedigraph 5000D |
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240 |
60.0±4.0 |
P240 |
58.5±2.0 |
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280 |
52.0±3.0 |
P280 |
52.2±2.0 |
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W63 |
63 - 50 |
320 |
46.0±2.5 |
F230/53 |
53±3.0 |
50.0±3.0 |
P320 |
46.2±1.5 |
W50 |
50 - 40 |
360 |
40.0±2.0 |
F240/45 |
44.5±2.0 |
42.0±2.0 |
P360 |
40.5±1.5 |
400 |
34.0±2.0 |
P400 |
35.0±1.5 |
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W40 |
40 - 28 |
500 |
28.0±2.0 |
F280/37 |
36.5±1.5 |
34.5±1.5 |
P500 |
30.2±1.5 |
600 |
24.0±1.5 |
F320/29 |
29.2±1.5 |
27.7±1.5 |
P600 |
25.8±1.0 |
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W28 |
38 - 20 |
700 |
21.0±1.3 |
F360/23 |
22.8±1.5 |
21.6±1.5 |
P800 |
21.8±1.0 |
800 |
18.0±1.0 |
F400/17 |
17.3±1.0 |
16.5±1.0 |
P1000 |
18.3±1.0 |
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W20 |
20 - 14 |
1000 |
15.5±1.0 |
F500/13 |
12.8±1.0 |
12.3±1.0 |
P1200 |
15.3±1.0 |
W14 |
14 - 10 |
1200 |
13.0±1.0 |
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1500 |
10.5±1.0 |
F600/9 |
9.3±1.0 |
9.0±1.0 |
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W10 |
10 - 7 |
2000 |
8.5±0.7 |
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W7 |
7 - 5 |
2500 |
7.0±0.7 |
F800/7 |
6.5±1.0 |
6.3±1.0 |
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W5 |
5 - 3.5 |
3000 |
5.7±0.5 |
F1000/5 |
4.5±0.8 |
4.5±0.8 |
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F1200/3 |
3.1±0.5 |
3.1±0.5 |
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for general purposes |
for general purposes |
for bonded abrasives |
for coated abrasives |
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Non-abrasive SiC (TN) (% by weight) | ||||
Chemical Composition |
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Type |
SiC min |
F.C max |
Fe2O3 max |
Size mm |
TN98 |
98.0 |
1.0 |
0.5 |
50-0 |
TN97 |
97.0 |
1.5 |
0.8 |
|
TN95 |
95.0 |
2.5 |
1.0 |
|
TN90 |
90.0 |
3.0 |
2.5 |
|
TN88 |
88.0 |
3.5 |
3.0 |
|
TN85 |
85.0 |
5.0 |
3.5 |
|
TN60 |
60.0 |
12.0 |
3.5 |
|
TN50 |
50.0 |
15.0 |
3.5 |
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Applications | |
Vitrified tools |
Lapping |
Resinoid tools |
Blasting |
Polishing |
Investment casting |
Tumbling |
Wear resistance |
Self-tumbling |
Refractory |
Lapping compound |
Wire saw |
Electrical |
Ceramic |
Electronic |
Nuclear |
