Black Silicon Carbide (SiC)
Synthesized at 2,200°C in electrical resistance furnaces from high-purity quartz sand and low-sulfur petroleum coke. Featuring 9.5 Mohs hardness (2,800 Knoop), sharp cleavage angles, and superior thermal conductivity for grinding stone, glass, ceramics, cast iron, wire-sawing wafers, and manufacturing high-temperature kiln furniture.
Smelting Precision & Grain Morphology Control
Industrial abrasive performance depends on crystal phase purity, bulk density (LPD), and zero oversize contamination. At our Gongyi smelting and sizing complex, every ton of Black Silicon Carbide (SiC) undergoes controlled fusion, impact shaping, and high-Gauss magnetic extraction.
Core-Zone Alpha-SiC Crystal Selection
We select dense, macro-crystalline Alpha-SiC ingots from the high-temperature core zone of our Acheson resistance furnaces, guaranteeing ≥98.5% SiC purity for abrasive grades and ≥90–95% for refractory grades.
Ultra-Low Free Carbon & Free Silicon Removal
Abrasive and wire-sawing micro-powders undergo chemical acid pickling and overflow water elutriation to remove residual graphite (free carbon ≤0.20%) and metallic iron, ensuring strong bond adhesion in resinoid and ceramic wheels.
Superior Penetration on Brittle & Non-Ferrous Workpieces
With 9.5 Mohs hardness sitting directly between corundum and diamond, Black SiC fractures along sharp hexagonal planes—cutting granite, marble, glass, chilled cast iron, and non-ferrous metals with minimal grinding heat.
Chemical Composition & Physical Parameters
Verified by in-house XRF fluorescence spectrometry and W.S. Tyler Ro-Tap mechanical sieve analysis. A signed Certificate of Analysis (COA) accompanies every shipment.
Available Grit Sizes & Particle Distribution Matrix
Precision-classified across multi-deck vibrating screens and air/water elutriation lines to meet strict international FEPA, JIS, and ASTM sieve tolerances.
| Grade / Classification | Available Size Range | Nominal Micron (µm) | Governing Standard | Primary Industrial Applications |
|---|---|---|---|---|
| FEPA F Macro Grits | F14, F16, F24, F36, F46, F60, F80, F100, F120, F150, F180, F220 | 1,700 µm – 53 µm | FEPA 42-1:2006 | Stone/concrete grinding segments, Frankfurt/Fickert blocks, wheels |
| FEPA P Coated Grits | P24, P36, P60, P80, P120, P180, P220, P240, P400, P600 | 715 µm – 25.8 µm | FEPA 43-1 / ISO 6344 | Waterproof silicon carbide sandpapers, glass/stone sanding belts |
| FEPA / JIS Micro Powders | F240–F1200 / JIS #240–#3000 | 44.5 µm – 4.0 µm | FEPA 42-2 / JIS R6001 | Optical glass lapping, quartz/piezoelectric wire sawing, ceramic seals |
| Refractory Fractions | 0–1 mm, 1–3 mm, 3–5 mm, 5–8 mm, 200#, 325# | 45 µm – 8,000 µm | ISO / GB/T 2480 | SiC kiln shelves, saggers, blast furnace tuyere bricks, castables |
| Metallurgical Briquettes & Grains | 1–10 mm, 0–10 mm (85% / 88% / 90% SiC) | 1,000 µm – 10,000 µm | YB/T Metallurgical | BOF/EAF steelmaking deoxidizer, ductile iron inoculant & carburizer |
Engineered for Heavy Industrial Performance
Consistent chemical purity and controlled grain geometry make our Black Silicon Carbide (SiC) a trusted raw material for global grinding tool, blasting, and refractory manufacturers.
4-Stage Metrology Lab Inspection & Batch Traceability
Every production lot is tested in our ISO 9001:2015 Gongyi laboratory before bagging. No shipment leaves our warehouse without a verified Certificate of Analysis.
X-Ray Fluorescence Chemical Analysis
Quantitative verification of primary crystal content and trace oxides (Fe2O3, SiO2, Na2O, TiO2) per GB/T and ISO analytical standards.
Ro-Tap Sieve & Laser Diffraction
Macro grits are tested on W.S. Tyler Ro-Tap sieve shakers; micro-powders are analyzed via Malvern laser diffraction for D10/D50/D90 accuracy.
Bulk Density (LPD) & Magnetic Check
Loose packed density, true specific gravity, moisture (<0.2%), and residual magnetic iron are measured to guarantee lot-to-lot consistency.
Signed COA & 12-Month Sample Retention
Each batch receives a traceable barcode and signed COA. A sealed 500g reference sample is archived in our lab for 12 months.
Moisture-Proof Export Packaging & Container Loading
Engineered to prevent bag tearing, moisture ingress, and pallet shifting during long-haul ocean freight from Qingdao, Tianjin, or Shanghai ports.
Frequently Asked Questions
Key technical parameters, grit sizing standards, and export logistics for Black Silicon Carbide.
What are the primary industrial applications of Black Silicon Carbide?
Black Silicon Carbide features extreme hardness (Mohs 9.2), excellent thermal conductivity, and chemical inertness. It is widely utilized for grinding cast iron, non-ferrous metals (copper, aluminum), stone, glass, ceramics, wire sawing of semiconductor ingots, and bonded refractory kiln furniture.
What is the SiC purity and free carbon content?
Our first-grade Black SiC contains SiC ≥98.0% to 98.5%, with free carbon ≤0.25% and Fe2O3 ≤0.4%. We also supply metallurgical grade SiC (88%-90% SiC) for steelmaking deoxidation and foundry cupola charge.
Can you supply refractory grain sizes and fine ball-milled powders?
Yes. We supply refractory grain mixtures (0-1mm, 1-3mm, 3-5mm) and fine ball-milled powders (-200 mesh, -325 mesh) for ramming mixes, refractory castables, and high-temperature SiC plates.
Request Quote & Free Samples
Submit your required specs. Our technical sales engineers respond within 4 hours during business days.