98% SiC refractory sand F012 F014 F016 silicon carbide
98% SiC refractory sand F012 F014 F016 silicon carbide
Product Introduction
Black silicon carbide (SiC) is also called black carborundum. It is a non-metallic material made from Petroleum coke and silicon sand by melting in a high-temperature resistance furnace. The main application of black silicon carbide in cast iron & ductile iron foundry is deoxidizer due to its high refractory stability, good thermal stability, high-temperature slag resistance, and good deoxidization and reduction properties. Adding silicon carbide to the iron before casting can improve the performance and quality of cast iron. Usually, 85-90% silicon carbide is suitable for the casting of gray cast iron, and 97-98% silicon carbide is suitable for the casting of ductile iron.
The melting point of silicon carbide is as high as 2700℃. During the process of melting cast iron in an induction furnace, it does not melt in high-temperature molten iron, but rather mix in cast iron. The addition of black silicon carbide can improve the carbon equivalent, serve as a Oxygen scavenger to strengthen the reducibility of molten iron. It can prevent carbide precipitation, improve the compactness of cast iron, increase the graphite spheroidization rate of nodular cast iron. Thus, adding carborundum can improve the quality of cast iron.
The fuctions of black silicon carbide particles in ductile iron casting:
Physical properties of Black silicon carbide F16/F20 for ductile iron foundry
|
Hardness: |
Mohs:9.2, Vicker :28-32 GPa |
|
Melting Point: |
dissociated at about 2300 °C |
|
Maximum service temperature: |
1900℃ |
|
Specific Gravity: |
|
|
Bulk density(LPD): |
|
|
Color: |
Black |
|
Particle shape: |
Hexagonal |
|
Modulus of Elasticity |
58-65x106 psi |
|
Coefficient of Thermal Expansion |
|
|
Thermal Conductivity |
71-130 W/MK |
Chemical contents of Black silicon carbide F16/F20 for ductile iron foundry
|
Item |
Content |
|
SiC |
|
|
SiO2 |
|
|
H2O3 |
|
|
Fe2O3 |
|
|
F,Si |
Other specifications of black silicon carbide for foundry & refractory:
|
SiC purity |
Fe2O3 |
Moisture |
||
|
SiC86 |
≥ 86% |
≤2.4% |
≤ 2.0% |
≤ 0.2% |
|
SiC88 |
≥ 88% |
≤ 2.3% |
≤ 2.0% |
≤ 0.2% |
|
SiC90 |
≥ 90% |
≤ 2.0% |
≤ 1.8% |
≤ 0.2% |
|
SiC92 |
≥ 92% |
≤ 1.8% |
≤ 1.7% |
≤ 0.2% |
|
SiC93 |
≥93% |
≤ 1.8% |
≤ 1.6% |
≤ 0.2% |
|
SiC95 |
≥ 95% |
≤ 1.0% |
≤ 1.3% |
≤ 0.2% |
|
SiC97 |
≥ 97% |
≤ 0.8% |
≤ 1.2% |
≤ 0.2% |
|
≥97.5% |
≤ 0.8% |
≤ 0.9% |
≤ 0.2% |
|
|
SiC98 |
≥ 98% |
≤ 0.5% |
≤ 0.5% |
≤ 0.2% |
Black silicon carbide particle sizes for foundry & refractory:
Macro grit and grain:F12,F14,F16,F20,etc.
Fraction:1-3mm 0-10mm,0-5mm,1-10mm,1-5mm, etc.
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