Black SiC

Black silicon carbide (Black SiC) appears blackish-gray or deep blackish-green in color, with hard and sharp particles. It has long been applied in numerous industries including abrasives, refractories, metallurgical additives, and mechanical manufacturing.

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Product Introduction

Products Description

Black SiC is a silicon carbide crystal produced by high-temperature smelting in an electric resistance furnace, primarily using high-quality quartz sand and petroleum coke as raw materials. It features strong cutting power, excellent wear resistance, high thermal conductivity, outstanding thermal stability, and high cost-effectiveness. It is suitable for most general grinding, sandblasting, cutting, manufacturing refractory bricks, and corrosion-resistant structural components.

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Product Advantages

Black SiC carbide possesses four key characteristics: hardness, sharpness, wear resistance, and temperature resistance, making it a fundamental raw material in the industrial abrasives and refractory industries.

Hardness and Toughness

With a Mohs hardness of approximately 9.0–9.2, Black SiC's microstructure provides excellent toughness. Its particles resist easy fragmentation, helping maintain long-term cutting performance.

Cutting Performance and Grinding Capability

Black SiC crystals exhibit a multi-faceted shape with high sharpness, enabling rapid material removal during grinding to enhance processing efficiency. Its strong cutting force and stable particle shape make it a fundamental component in most abrasive products.

Thermal Conductivity

Black SiC exhibits high thermal conductivity and low thermal expansion, resisting deformation and decomposition under high temperatures. It maintains structural integrity and chemical stability even in high-temperature shock environments, making it a vital component in refractory materials.

Oxidation Resistance and Corrosion Resistance

Black SiC demonstrates exceptional chemical resistance in chemical processing and highly corrosive conditions, outperforming most metallic materials in corrosion resistance.

Application Industries

1. Abrasives and Grinding Industry (Most Widely Used)

Black SiC is the most fundamental and commonly used material in the abrasives industry, including:

Bonded abrasives (grinding wheels, grinding blocks)
Coated abrasives (sandpaper, sanding belts)
Cutting abrasives, blasting media
Polishing abrasives

Suitable for processing metals, ceramics, stone, glass, plastics, and other materials.

2. Refractory Industry

Black silicon carbide is a common raw material for high-performance refractories:

High-alumina bricks, silicon carbide bricks
Cast wear-resistant components
Burner bricks
Kiln accessories
High-temperature crucibles and pots

Its high-temperature resistance and oxidation resistance significantly extend the service life of refractory products.

3. Machinery Manufacturing and Sandblasting

Due to its high hardness and sharp particles, Black SiC grit is a staple material in the sandblasting industry, used for:

Metal rust removal
Surface roughening
Mold cleaning
Metal deburring
Pre-treatment for coatings

Durable, shatter-resistant, and reusable.

4. Metallurgical Industry (Deoxidation / Carbon Addition / Heat Retention Additive)

Black silicon carbide also serves as a practical material in steel production:

Used as a carbon additive in furnace charge
Substitutes for certain ferroalloys in deoxidation
Increases molten metal temperature
Reduces production costs

Many foundries regard it as an effective auxiliary material for improving furnace efficiency and lowering energy costs.

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Sic Silicon Carbide

Manufacturing Of Silicon Carbide