Product Overview & Key Features

Silicon Carbide (chemical formula: SiC) is produced by carbothermal reduction of high-purity quartz sand and petroleum coke at temperatures exceeding 2200°C in an electric resistance furnace. The resulting material is crushed, graded, and optionally refined to achieve specific properties.

Why Choose Silicon Carbide? 🎯

Property	Advantage
💎 Hardness	9.5 on Mohs scale (intermediate between corundum and diamond)
🔥 Thermal conductivity	120–170 W/m·K (3x higher than steel)
⚡ Electrical resistivity	10⁵–10⁶ Ω·cm (semiconducting grade available)
🧪 Chemical resistance	Inert to acids, alkalis, and molten metals
🌡️ Maximum service temperature	1600°C in air, 2300°C in inert atmosphere

Main Product Types:

Grade	Color	Purity (SiC)	Key Applications
Black SiC	Black	97–99%	Abrasive wheels, refractory bricks, metallurgical deoxidizer
Green SiC	Green	99%+	Precision grinding, ceramic membranes, semiconductor components
Metallurgical SiC	Dark gray	85–95%	Iron and steel inoculation, desulfurization, slag conditioning
Refractory SiC	Dark gray	88–97%	Kiln furniture, crucibles, burner nozzles

Technical Specifications & Product Parameters

📊 Silicon Carbide Chemical Composition Table

Parameter	Black SiC (Standard)	Black SiC (Premium)	Green SiC	Metallurgical SiC
SiC (min)	97.0%	98.5%	99.0%	85–95%
SiO₂ (max)	1.2%	0.5%	0.3%	2.0–5.0%
Free C (max)	0.5%	0.3%	0.2%	1.0–3.0%
Fe₂O₃ (max)	0.8%	0.4%	0.2%	1.0–2.5%
Al₂O₃ (max)	0.3%	0.2%	0.1%	–
Moisture (max)	0.2%	0.1%	0.1%	0.5%

📐 Particle Size Distribution Options

Grit Size (FEPA)	Micron Range (µm)	Typical Use
F8–F30	2800–600	Coarse grinding, wire sawing
F36–F60	500–180	General abrasive, lapping
F70–F120	125–45	Precision grinding, polishing
F150–F240	45–25	Fine finishing, optical grinding
F280–F600	25–8	Superfine polishing
F800–F2000	6–1	Mirror finishing, wafer polishing
Powder (-325 mesh)	<44	Refractory, metallurgical additive
Powder (-200 mesh)	<74	Slurry, ceramic forming

Key Applications & Industry Solutions

Silicon Carbide serves diverse industries due to its unique combination of properties. Below is a detailed application guide.

🔹 Abrasives & Grinding

SiC is the second-hardest synthetic abrasive (after diamond), making it ideal for:

Grinding wheels for non-ferrous metals (aluminum, brass, titanium)

Sandpaper and coated abrasives for wood, glass, and stone

Lapping and polishing powders for optical lenses and semiconductor wafers

Wire sawing slurries for photovoltaic silicon ingot cutting

Recommendation: Green SiC for precision applications; Black SiC for general grinding.

🔹 Refractories & High-Temperature Components

The exceptional thermal properties of silicon carbide enable:

Kiln furniture (shelves, posts, beams) for ceramic firing

Crucibles for non-ferrous metal melting (aluminum, copper, zinc)

Burner nozzles, thermocouple protection tubes, and radiant tubes

SiC-based refractory bricks and castables for blast furnace linings

Recommendation: Refractory grade SiC (88–97%) with optimized particle size distribution.

🔹 Metallurgical Applications

Silicon carbide serves as a cost-effective additive in iron and steel production:

Inoculant / deoxidizer – Removes oxygen from molten steel

Carburizer – Adjusts carbon content in cast iron

Slag conditioner – Improves slag fluidity and reduces viscosity

Graphite raiser – Enhances graphite nucleation in ductile iron

Recommendation: Metallurgical grade SiC (85–95%, 0–5 mm or 0–10 mm lump).

🔹 Advanced Ceramics & Membranes

High-purity silicon carbide enables technical ceramic components:

Ceramic membranes – High-flux, fouling-resistant filtration for water treatment

Mechanical seals – Extreme wear resistance for pumps

Ballistic armor – Lightweight ceramic plates for body and vehicle armor

Semiconductor components – Susceptors, rings, and chambers for CVD processes

Recommendation: Premium green SiC (99%+) with controlled particle shape.

FAQ

Q: What is the minimum order quantity (MOQ)?

A: Standard MOQ is 20 metric tons (one 20-foot container) for metallurgical and refractory grades. For abrasive and high-purity grades, MOQ is 10 metric tons. Sample quantities (1–5 kg) are available for testing at no charge (buyer pays shipping).

Q: How should silicon carbide be stored?

A: Silicon carbide is stable and non-hygroscopic when properly packaged. Store in a dry, covered area away from moisture and extreme temperature changes. Keep packaging sealed until use to prevent contamination. Shelf life is unlimited under proper storage conditions.

Q: Can silicon carbide be used in food or pharmaceutical applications?

A: High-purity silicon carbide (99.5%+ with controlled heavy metals) is chemically inert and contains no leachable components. It can be used in food and pharmaceutical processing equipment, including pumps, seals, and filtration membranes, provided it meets relevant regulatory standards (e.g., FDA compliance upon request). Please specify your application for appropriate grade selection.