Black Silicon Carbide Introduction:

Black Silicon Carbide, also known as black carborundum, is derived from the synthesis of high-purity quartz sand and petroleum coke as primary raw materials in an electric resistance furnace operating at high temperatures. In comparison to green silicon carbide, black SiC exhibits lower purity, hardness, and brittleness. It comprises 85-98% SiC, along with admixtures such as Fe2O3, Al2O3, CaO, SiO2, and MnO2.

Known for its exceptional hardness (9.2 on the Mohs scale) and microhardness (approximately 2940-3320 KG/mm2), black SiC also boasts good thermal conductivity, low thermal expansion (diminishing with temperature increase), and high strength, making it widely applicable. Its hardness and sharpness render it an aggressive material suitable for applications demanding high purity.

Black silicon carbide finds extensive use in grinding wheels, lapping materials, and refractory raw materials.

Black Silicon Carbide Grain for Abrasive Usage

Black Silicon Carbide Chemical Analysis: 

Purpose	Grain		Chemical(%)
			SIC min	F.C max	Fe2O3max
Abrasive grade	F	12-80	98	0.20	0.6
		90-150	97	0.30	0.8
		180-220	96.5	0.30	1.2
		240-1200	96	0.35	1.35
Refractory grade	Segments	0-1mm 1-3mm 3-5mm 5-8mm	97	0.35	1.35
	Fine Powder	-180mesh -200mesh -240mesh -320mesh	97	0.35	1.35

Black Silicon Carbide Physical Properties:

Color	Black
Hardness(Mohs)	≥9
Microhardness(kg/mm2)	2940-3320
Melting point(℃)	2600
Maximum   temperature(℃)	1900
True   density(g/cm3)	3.20-3.25
Bulk   density(g/cm3)	≥1.38
High thermal   conductivity(W/m-K)	100
Linear expansion   coefficient (at 900℃α·10-6K-1)	4.4

Black Silicon Carbide Granule specifics:

Macrogrit Sizes F12 to F220.
0-1mm, 1-3mm, 3-5mm, 5-8mm, etc.

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

Black Silicon Carbide Packaging:

1M/T woven bag or 25kg woven bag/paper bag.
Packaging can be OEM customized.