Black silicon carbide (C)

Black silicon carbide (C) is produced by petroleum coke, quality silicon sand and appended with salt in an electric arc furnace at high temperatures. The hardness and brittleness are lower than that of green silicon carbide. The materials are used to grind cast iron, non-ferrous metals, rubber, leather, plastic, wood, mineral rocks,etc. It can also be used to manufacture high-class refractory products.

 

 

Grain Usages and Types

Usage

For bonded abrasives

For coated abrasives

Type

C

C-P

 

 

Physical Characteristics

Item

Basic mineral

Crystal system

Crystal color

Mohs hardness

Density

Black silicon carbide

α- SiC

Hexagonal

Black

9.15

≥3.12g/cm3

Item

Micro hardness

Electrical resistivity

Grinding ability(compared
with diamond as one)

Linear expansion coefficient
(when 900℃ α•10-6k-1)

Black silicon carbide

HV3100-3280

3×105-3×107Ω•cm

0.25

4.4

 

 

Chemical Composition ( GB/T 2480-2008 )

Type

Grit

Chemical composition(%,by weight)

SiC

F.C

Fe2O3

C

F4-F90

≥98.60

≤0.20

≤0.40

F100-F150

≥98.10

≤0.25

≤0.50

F180-F220

≥97.20

≤0.30

≤0.55

F230-F280

≥97.20

≤0.30

≤0.55

F320-F500

≥97.00

≤0.35

≤0.60

F600-F800

≥96.50

≤0.40

≤0.60

F1000-F1200

≥95.50

≤0.50

≤0.70

C-P

P12-P100

≥98.60

≤0.20

≤0.40

P120-P150

≥98.10

≤0.25

≤0.50

P180-P220

≥97.20

≤0.30

≤0.55

P240-P360

≥97.20

≤0.30

≤0.55

P400-P1000

≥97.00

≤0.35

≤0.60

P1200-P1500

≥96.50

≤0.40

≤0.60

P2000-P2500

≥95.50

≤0.50

≤0.70

 Note: Special requirement on chemical composition can be satisfied through discussion.

 



Black Silicon Carbide (C)