Black, frangible and sharp, good thermal conductivity and electric
conductivity.
Microcosmic shape is a hexagonal crystal, Mohs hardness is 9.2.,
Vickers hardness is 3000-3300 kg/mm, microhardness is
3000-3300kg/mm3. Among abrasives, silicon carbide’s hardness is
higher than corundum, and ranked below diamond, CBN and boron
carbide. Density generally viewed is 3.20g/ mm3 , density of heap
is 1.2-1.6g/ mm3 , specific gravity is 3.20～3.25. Raw material of
green silicon carbide are petroleum coke and quality silicon sand,
appended with salt, then smelt in electric arc furnace. Compared
with green silicon carbide, the purity, hardness and brittleness of
black silicon carbide are lower .
Main applications: solar wafer, semiconductor wafer and quartz chip
wire sawing and lapping; bonded and coated abrasive tools; stone
polishing; processing metal and non-ferrous metal with low tensile
strength, such as gray pig iron, brass, aluminum, stone, leather
and rubber. Particle size comparison of commonly used abrasive | Particle size distribution (micron) | | | | D3 | D50 | D94 | SiC%） | Fe2O3 ≤(%) | FC ≤(%) | | | | GC#800 | ≤20.0 | 14.0±1.0 | ≥9.0 | 99.00 | 0.20 | 0.2 | 6--8 | 1.18 | 0.008 | GC#1000 | ≤18.3 | 11.5±1.0 | ≥7.0 | 98.50 | 0.20 | 0.2 | 6--8 | 1.15 | 0.008 | GC#1200 | ≤17.5 | 9.5±0.8 | ≥5.5 | 98.50 | 0.20 | 0.2 | 6--8 | 1.13 | 0.005 | GC#1500 | ≤14.5 | 8.0±0.6 | ≥4.5 | 98.00 | 0.20 | 0.2 | 6--8 | 1.12 | 0.005 | GC#1800 | ≤13.5 | 7.0±0.6 | ≥4.2 | 98.00 | 0.20 | 0.2 | 6--8 | 1.05 | 0.005 | GC#2000 | ≤13.0 | 6.7±0.6 | ≥4.0 | 98.00 | 0.20 | 0.2 | 6--8 | 1.00 | 0.005 |
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