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green silicon carbide

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

Crystal Form Alpha SiC hexagonal system
Chemical nature Slight acid
Reaction with acids Very slight surface action with hydrofluoric acid
Reaction with Alkalis Attacked at high temperature by alkalis and iron oxide
Oxidation-reduction effects   Starts to oxide slowly at 800°C. No reduction
True Density (g/cm3) 3.20
Hardness   Knoop (kg/cm2) 2500-2900
Moh’s 9.5
Color Green
Color after firing Green
Decomposition point 2300°C
Max Usable temperature 1540°C  in air
Specific heat (cal/g.oC ) 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
0.080 0.061 0.051
Electrical resistivity(Wcm) 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 25°C -1000°C 25°C-1500°C 25°C-2000°C 25°C-2500°C
4.63 5.12 5.48 5.77 5.94
             

 
Chemical Composition (% by weight)

Grit sizes 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
 

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