Products Description

Black SiC is a synthetic ceramic material produced through the Acheson process, which involves heating a mixture of silica sand and petroleum coke at extreme temperatures (2,200–2,500°C).

Key Characteristics:

🔹 Color: Dark gray to black
🔹 Purity: 95–99% SiC (lower than green SiC)
🔹 Hardness: 9.5 Mohs (near diamond)
🔹 Thermal Stability: Up to 1,600°C

Unlike green SiC (higher purity, used for precision polishing), black SiC is more affordable and ideal for heavy-duty grinding, blasting, and refractory applications.

Key Properties & Benefits

1. Extreme Hardness & Abrasive Performance 💎

Mohs hardness of 9.5 (second only to diamond)
Ideal for grinding: Metals, ceramics, glass, and stone
Long-lasting cutting edges in abrasive tools

2. High Thermal Conductivity & Shock Resistance 🔥

120–200 W/m·K thermal conductivity (3x higher than steel)
Resists thermal cracking in rapid heating/cooling cycles
Used in kiln furniture, foundry linings, and brake pads

3. Chemical & Corrosion Resistance ⚗️

Inert to acids, alkalis, and molten metals
No oxidation below 1,400°C
Perfect for chemical reactor coatings

4. Cost-Effective & Widely Available 💰

Cheaper than green SiC and diamond abrasives
Bulk quantities available for industrial use

Manufacturing Process

Black SiC powder is produced in three key stages:

1. Raw Material Mixing

Silica sand (SiO₂) + Petroleum coke (C) blended with salt and sawdust

2. High-Temperature Furnace Reaction (Acheson Process)

Heated to 2,200–2,500°C in an electric arc furnace

Chemical reaction:

SiO2+3C→SiC+2CO

3. Crushing, Milling & Classification

Crushed into grains ranging from coarse grit (8–24 mesh) to fine powder (microns)

Magnetic separation removes iron impurities

Top Applications of Black SiC Powder

1. Abrasives & Surface Preparation ✨

Sandblasting & Shot Peening: Cleans and roughens metal surfaces
Grinding Wheles & Cutting Discs: For steel, titanium, and composites
Lapping & Polishing: Optics, semiconductors, and precision parts

2. Refractories & Foundry 🏭

Furnace Linings: Resists molten metal corrosion
Kiln Shelves & Saggers: Supports ceramic firing
Castable Refractories: Enhances heat resistance

3. Metallurgy & Steelmaking ⚡

Deoxidizer: Removes oxygen in steel production
Carburizing Agent: Boosts carbon content in molten iron

4. Automotive & Aerospace 🚗✈️

Brake Pads & Clutches: Improves heat dissipation
Turbine Component Coatings: Resists wear at high speeds

5. Electronics & Semiconductors 🔌

Wafer Backgrinding: Thins silicon wafers before dicing
Thermal Interface Materials: Enhances heat sink performance

Black SiC vs. Green SiC vs. Aluminum Oxide

Property	Black SiC	Green SiC	Aluminum Oxide
Hardness (Mohs)	9.5	9.5	9.0
Purity	95–99%	99%+	85–99%
Cost	$$	$$$	$
Best For	Heavy grinding, refractories	Precision polishing	General-purpose abrasives