Black Silicon Carbide

Crystal Form

Alpha SiC hexagonal system

Chemical nature

Slight acid

Reaction with acids

Very slight surface action with hydrofluoric acid

Reaction with Alkalies

Attcked at high temperature by alkalles and iron xide

Oxidation-reduction effects

Starts to oxide slowly at 800^oC. No reduction

True Density (g/cm³)

3.20

Hardness

Knoop (kg/cm²)

2200-2500

Moh's

9.5

Color

Black

Color after firing

Black

Decomposition point

2200^oC

Max Usable temperature

1540^oC in air

Specific heat (cal/g.^oC)

0^oC

500^oC

1000^oC

0.14

0.28

0.13

Coefficient of thermal conductivity ( cal/cm².sec.^oC)

600^oC

800^oC

1000^oC

0.080

0.061

0.0510

Electrical resistivity (Wcm)

25^oC

100^oC

400^oC

800^oC

1400^oC

50

46.4

26.6

7.8

0.65

Coefficient of liner expansion (x10^-6)

25^oC-500^oC

25^oC-1000^oC

25^oC-1500^oC

25^oC-2000^oC

25^oC-2500^oC

4.63

5.12

5.48

5.77

5.94

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

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

China GB 2477-83

JIS

FEPA(84) / DIN(70)

ISO(77)

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

240

60.0±4.0

P240

58.5±2.0

280

52.0±3.0

P280

52.2±2.0

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

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

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

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

1500

10.5±1.0

F600/9

9.3±1.0

9.0±1.0

W10

10 - 7

2000

8.5±0.7

W7

7 - 5

2500

7.0±0.7

F800/7

6.5±1.0

6.3±1.0

W5

5 - 3.5

3000

5.7±0.5

F1000/5

4.5±0.8

4.5±0.8

F1200/3

3.1±0.5

3.1±0.5

for general purposes

for general purposes

for bonded abrasives

for coated abrasives

Chemical Composition

Type

SiC min

F.C max

Fe₂O₃ max

Size mm

TN98

98.0

1.0

0.5

50-0
13-0
10-0
5-0
0.5-0

100#-0
220#-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

Vitrified tools        

Lapping          

Resinoid tools        

Blasting          

Polishing            

Investment casting  

Tumbling            

Wear resistance    

Self-tumbling      

Refractory        

Lapping compound

Wire saw        

Electrical            

Ceramic                        

Electronic          

Nuclear