Black Silicon Carbide for Abrasive Paper

Product Detail

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
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 800oC. 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		2200oC
Max Usable temperature		1540oC in air
Specific heat (cal/g.oC)		0oC			500oC			1000oC
		0.14			0.28			0.13
Coefficient of thermal conductivity (cal/cm2.sec.oC)		600oC			800oC			1000oC
		0.080			0.061			0.0510
Electrical resistivity (Wcm)		25oC	100oC			400oC	800oC		1400oC
		50	46.4			26.6	7.8		0.65
Coefficient of liner expansion (x10-6)		25oC-500oC		25oC-1000oC		25oC-1500oC	25oC-2000oC		25oC-2500oC
		4.63		5.12		5.48	5.77		5.94




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)
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










Non-abrasive SiC (TN) (% by weight)
	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




 




Applications
Vitrified tools	Lapping
Resinoid tools	Blasting
Polishing	Investment casting
Tumbling	Wear resistance
Self-tumbling	Refractory
Lapping compound	Wire saw
Electrical	Ceramic
Electronic	Nuclear