Black Silicon Carbide (Black SiC) is synthesized at high temperature 2000‑2200 ℃ in electric resistance furnace with silica sand and petroleum coke as raw materials. After cooling, crushing, sizing and magnetic separation, we obtain granular grits and fine powders with hexagonal α‑SiC crystal structure.Black SiC features Mohs hardness 9.2, high thermal conductivity, low thermal expansion coefficient, excellent thermal‑shock resistance, good wear‑resistance and acid‑alkali corrosion resistance. It owns better toughness compared with green silicon carbide with competitive cost, widely used for refractory, abrasive and metallurgical deoxidation fields。
Key Features：
‑ High thermal conductivity and low thermal expansion, outstanding thermal‑shock resistance and excellent wear‑resistant performance.
‑ Good chemical inertness against most acids and alkalis, high hot‑strength.
‑ Important note: Black SiC will be oxidized above 1350 ℃ under oxidizing atmosphere, anti‑oxidation formula is required for such working condition; maximum service temperature reaches 1900 ℃ under inert atmosphere.
‑ Sharp grain texture, suitable for both abrasive processing and steel‑making deoxidation.
Available Grades：
‑ Standard refractory grade: SiC ≥97%
‑ High‑purity refractory grade: SiC ≥98.5%
-Other grade:SiC＜97%
Main Applications：
‑ Refractory industry: aggregate for silicon‑carbide castables and other monolithic refractories; raw material for SiC bricks, kiln furniture, iron runner mixes and boiler wear‑resistant linings.
‑ Abrasive industry: grinding wheels, cutting discs, sandblasting media, lapping and polishing.
‑ Metallurgical industry: deoxidizer for steel‑making, adjust carbon‑silicon composition of molten steel.
‑ Wear‑resistant ceramics and anti‑corrosion filler.
Available Sizes& Packing：
Refractory fractions: 0‑1 mm,1‑3 mm,3‑5 mm,5‑8 mm;
Powder:100mesh,200mesh,325mesh
Abrasive grits comply with FEPA‑F standards.
*Sizes can be customized upon request.
Packing: 1/1.25 MT ton bags, 25 kg bags or on request.
COA certificate provided per batch.
Specification:
Chemical Composition | SIC985 | SIC98 | SIC97 | SIC90 | SIC88 | SIC85 | SIC40 |
SiC | 98.5%min | 98%min | 97%min | 90%min | 88%min | 85%min | 40%min |
Free Carbon(F.C) | 0.2%max | 0.2%max | 0.3%max | 2.5%max | 3%max | 5%max |
|
Fe₂O₃ | 0.6%max | 0.6%max | 0.7%max | 2.5%max | 3%max | 3.5%max |
|
Mohs Hardness | 9.2 | 9.2 | 9.2 | 9.2 | 9.2 | 9.2 | 9.2 |
*Specifications and Sizes can be customized upon request.
Available Sizes& Packing：
Refractory fractions: 0‑1 mm,1‑3 mm,3‑5 mm,5‑8 mm;
Powder:100mesh,200mesh,325mesh
Abrasive grits comply with FEPA‑F standards.
*Sizes can be customized upon request.
Packing: 1/1.25 MT ton bags, 25 kg bags or on request.
COA certificate provided per batch.