Silicon Carbide Applications: Black Silicon Carbide and Green Silicon Carbide Uses Guide
Introduction
Silicon carbide (SiC), also known as carborundum, is one of the most important synthetic abrasive materials in modern industry. Due to its excellent properties including high hardness, sharp cutting ability, high thermal conductivity, chemical stability, and wear resistance, silicon carbide is widely used in abrasive manufacturing, surface treatment, ceramics, refractory materials, semiconductor manufacturing, and precision polishing.
According to different raw materials and production processes, silicon carbide abrasives are mainly divided into two types:
- Black Silicon Carbide (Black SiC)
- Green Silicon Carbide (Green SiC)
Although both materials have similar crystal structures and hardness, they have different characteristics and application fields.
This article introduces the main applications of black silicon carbide and green silicon carbide, including recommended grit sizes for different industrial uses.
1. What Is Silicon Carbide?
Silicon carbide is a synthetic compound produced by reacting silica sand and carbon at high temperatures.
The chemical formula is:
SiC
Silicon carbide has the following properties:
| Property | Value |
|---|---|
| Chemical Formula | SiC |
| Mohs Hardness | 9.0-9.5 |
| Melting Point | About 2250°C |
| Crystal Structure | Hexagonal / Cubic |
| Thermal Conductivity | High |
| Abrasive Performance | Excellent |
Because of its high hardness and sharp edges, silicon carbide is an ideal abrasive material for cutting, grinding, blasting, and polishing.
2. Black Silicon Carbide Applications
What Is Black Silicon Carbide?
Black Silicon Carbide is produced from quartz sand, petroleum coke, and other raw materials through high-temperature electric resistance furnaces.
It contains a small amount of free carbon, which gives it a black appearance.
Compared with green silicon carbide, black SiC has:
- High toughness
- Strong impact resistance
- Excellent cutting performance
- Good cost efficiency
Therefore, black silicon carbide is mainly used for general abrasive applications.
2.1 Sandblasting Applications
Black silicon carbide is widely used as a blasting abrasive because of its sharp particles and high cutting efficiency.
It can remove:
- Rust
- Oxide layers
- Paint coatings
- Surface contamination
Common grit sizes:
| Application | Recommended Grit |
|---|---|
| Heavy rust removal | #16 – #24 |
| Steel surface preparation | #24 – #46 |
| Aluminum and stainless steel blasting | #46 – #80 |
| Fine surface finishing | #120 – #220 |
Typical products:
- Black Silicon Carbide #24 Grit
- Black Silicon Carbide #46 Grit
- Black Silicon Carbide #60 Grit
- Black Silicon Carbide #80 Grit
2.2 Bonded Abrasives
Black silicon carbide is commonly used in bonded abrasive products such as:
- Grinding wheels
- Cutting discs
- Abrasive stones
- Honing tools
Its sharp cutting edges provide fast material removal.
Recommended grit sizes:
| Product | Grit |
|---|---|
| Cutting wheels | #24 – #60 |
| Grinding wheels | #36 – #100 |
| Sharpening stones | #120 – #320 |
Examples:
Used for:
- Heavy grinding
- Stone grinding
- Metal surface processing
Used for:
- General grinding
- Tool sharpening
- Surface preparation
2.3 Glass and Stone Processing
Black silicon carbide is widely used for processing:
- Glass
- Marble
- Granite
- Ceramic materials
Applications include:
- Glass edge grinding
- Stone cutting
- Surface shaping
Recommended grit:
| Application | Grit |
|---|---|
| Stone cutting | #24 – #60 |
| Glass grinding | #80 – #180 |
| Ceramic grinding | #120 – #240 |
2.4 Refractory Materials
Due to its excellent thermal stability, black silicon carbide is used in:
- Kiln furniture
- Furnace lining
- Refractory bricks
- Heat-resistant components
Recommended sizes:
- 0-1mm
- 1-3mm
- 3-5mm
- 5-8mm
3. Green Silicon Carbide Applications
What Is Green Silicon Carbide?
Green Silicon Carbide is produced from high-purity petroleum coke and silica.
Compared with black SiC, green silicon carbide has:
- Higher purity
- Higher hardness
- Better self-sharpening performance
- Lower impurity content
It is mainly used for precision grinding and high-end applications.
3.1 Precision Grinding
Green silicon carbide is widely used for precision grinding of hard materials.
Applications:
- Tungsten carbide
- Titanium alloy
- Optical glass
- Ceramics
- Semiconductor materials
Recommended grit sizes:
| Application | Grit |
|---|---|
| Rough grinding | #60 – #120 |
| Precision grinding | #180 – #400 |
| Fine grinding | #600 – #1200 |
Common products:
- Green Silicon Carbide F80
- Green Silicon Carbide F120
- Green Silicon Carbide F220
- Green Silicon Carbide F320
3.2 Semiconductor Industry
Green silicon carbide powder is used in semiconductor-related applications because of its:
- High purity
- Low impurity level
- Excellent thermal properties
Applications:
- Silicon wafer processing
- Crystal cutting
- Semiconductor polishing
Recommended powder sizes:
| Application | Particle Size |
|---|---|
| Wafer cutting | F240-F600 |
| Precision processing | F800-F1200 |
| Ultra-fine polishing | W5-W20 |
3.3 Optical Glass Polishing
Green silicon carbide is commonly used for:
- Optical lenses
- Camera glass
- Precision glass components
Advantages:
- Uniform particle size
- Sharp cutting ability
- Low surface damage
Recommended grit:
| Process | Grit |
|---|---|
| Initial grinding | #240 |
| Intermediate grinding | #400-#800 |
| Fine grinding | #1000-#2000 |
3.4 Ceramic Processing
Green silicon carbide is suitable for ceramic materials because of its hardness and thermal stability.
Applications:
- Ceramic tiles
- Engineering ceramics
- Advanced ceramics
Recommended grit:
- F120
- F220
- F320
- F600
4. Black Silicon Carbide vs Green Silicon Carbide
| Feature | Black SiC | Green SiC |
|---|---|---|
| Purity | Lower | Higher |
| Color | Black | Green |
| Toughness | Higher | Lower |
| Hardness | High | Higher |
| Cutting ability | Strong | Excellent |
| Price | More economical | Higher |
| Main Use | General abrasive | Precision processing |
5. How to Choose Silicon Carbide Grit Size?
The grit size depends on the processing purpose.
Coarse Grit
Examples:
- #16
- #24
- #36
Used for:
- Heavy grinding
- Rust removal
- Cutting
Medium Grit
Examples:
- #46
- #60
- #80
- #120
Used for:
- General grinding
- Surface preparation
- Blasting
Fine Grit
Examples:
- #220
- #400
- #600
Used for:
- Precision grinding
- Polishing preparation
Micro Powder
Examples:
- F800
- F1000
- F1200
- W5
Used for:
- Optical polishing
- Semiconductor processing
- Ultra-fine finishing
6. Choosing a Silicon Carbide Supplier
When purchasing silicon carbide abrasives, customers should consider:
- Chemical purity
- Particle size distribution
- Grit standard (FEPA, JIS, ANSI)
- Packaging
- Production capacity
- Quality control
A professional silicon carbide manufacturer can provide customized grit sizes according to different applications.
Conclusion
Silicon carbide is a versatile abrasive material used in many industries.
Black Silicon Carbide is mainly suitable for:
- Sandblasting
- Grinding wheels
- Stone processing
- Refractory applications
Common grit sizes:
#16, #24, #36, #46, #60, #80, #120, #220
Green Silicon Carbide is mainly used for:
- Precision grinding
- Optical glass polishing
- Semiconductor processing
- Ceramic manufacturing
Common grit sizes:
#240, #400, #600, #800, #1000, #1200, #2000
Choosing the correct silicon carbide type and grit size can significantly improve processing efficiency and surface quality.