Black/ Green Silicon Carbide

Black/ Green Silicon Carbide: -Green Silicon Carbide is produced in an electric resistance furnace from quartz sand, petroleum coke and salt at high temperature. It ‚¬ semi-transparent in green color with friability, high purity and high hardness. It ‚¬ 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 ‚¬ 9.5
Color Green
Color after firing Green
Decomposition point 2300oC
Max Usable temperature 1540oC in air
Specific heat (cal/g.oC ) 0oC 500oC 1000oC
0.14 0.28 0.13
Coefficient of thermal conductivity (cal/cm2.sec.oC ) 600oC 800oC 1000oC
0.080 0.061 0.051
Electrical resistivity(Wcm) 25oC 100oC 400oC 800oC 1400oC
50 46.4 26.6 7.8 0.65
Coefficient of liner expansion (x10-6) 25oC -500oC 25oC -1000oC 25oC -1500oC 25oC-2000oC 25oC-2500oC
4.63 5.12 5.48 5.77 5.94 Chemical Composition (% by weight) Grit 20# - 90# 100# - 180# 220# - 240# 280# - 400# 500# -600#
800# - 1200# SiC 99.0 min 98.0 min 97.5 min 97.0 min 95.5 min 94.0 min
F.C 0.20 max 0.25 max 0.25 max 0.30 max 0.30 max 0.50 max
Fe2O3 0.20 max 0.50 max 0.70 max 0.70 max 0.70 max 0.70 max Magnetic Material Content (% by weight) Grit Magnetic material Content
16#-30# 36#-60# 70#-120# 150#-220#
Available Sizes10-F220, F230-1200,W63-W5,JIS240-JIS3000.
Other sizes can be also available according to customers requirements
Applications Grinding wheels Electrical
Coated tools Heating elements
Polishing Ceramic
Lapping Refractory Packing 25 kgs or 50 kgs packed in three layers bags, or can be packed on reques