green silicon carbide
Green Silicon Carbide is produced in electric resistance furnace from quartz sand,
petroleum coke and salt in high temperature. It’s semi-transparent in green
color with crystal structure, high hardness and strong cutting ability, stable
chemical characteristics, good thermal conductivity. It’s suited for grinding
hard, brittle and non-metallic such as cemented carbides, optical glass,
ceramics, etc.
Chemical & Physical Properties
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Crystal Form
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Alpha SiC hexagonal system
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Chemical nature
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Slight acid
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Reaction with acids
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Very slight surface action with
hydrofluoric acid
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Reaction with Alkalis
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Attacked at high temperature by alkalis
and iron oxide
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Oxidation-reduction effects
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Starts to oxide slowly at 800°C. No
reduction
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|
True Density (g/cm3)
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3.20
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Hardness
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Knoop (kg/cm2)
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2500-2900
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Moh’s
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9.5
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Color
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Green
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Color after firing
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Green
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Decomposition point
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2300°C
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Max Usable temperature
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1540°C in air
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Specific heat (cal/g.oC )
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0°C
|
500°C
|
1000°C
|
|
0.14
|
0.28
|
0.13
|
|
Coefficient of thermal conductivity (cal/cm2.sec.oC)
|
600°C
|
800oC
|
1000°C
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|
0.080
|
0.061
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0.051
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Electrical resistivity(Wcm)
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25°C
|
100°C
|
400°C
|
800°C
|
1400°C
|
|
50
|
46.4
|
26.6
|
7.8
|
0.65
|
|
Coefficient of liner expansion (x10-6)
|
25°C -500°C
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25°C -1000°C
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25°C-1500°C
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25°C-2000°C
|
25°C-2500°C
|
|
4.63
|
5.12
|
5.48
|
5.77
|
5.94
|
|
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Chemical Composition (% by weight)
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Grit sizes
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SiC
|
F.C
|
Fe2O3
|
|
20# - 90#
|
99.0 min
|
0.20 max
|
0.20 max
|
|
100# - 180#
|
98.5 min
|
0.25 max
|
0.50 max
|
|
220# - 240#
|
97.5 min
|
0.25 max
|
0.70 max
|
|
280# - 400#
|
97.0 min
|
0.30 max
|
0.70 max
|
|
500# - 600#
|
95.5 min
|
0.30 max
|
0.70 max
|
|
800# - 1200#
|
94.0 min
|
0.30 max
|
0.70 max
|