325mesh Black SIC for Silicon Carbide Crucible

Silicon carbide (SiC) crucibles offer several advantages over traditional crucible materials like graphite, clay-graphite, or quartz, especially in high-temperature and reactive environments. Here are the key benefits of using silicon carbide crucibles:

1. High Thermal Conductivity

• SiC has excellent thermal conductivity (≈120 W/m·K), ensuring rapid and uniform heating.

• Reduces thermal stress and cracking compared to materials like alumina or quartz.

2. Exceptional Thermal Shock Resistance

• SiC can withstand rapid temperature changes without cracking, making it ideal for processes involving sudden heating or cooling.

3. High-Temperature Stability

• Operates effectively at temperatures up to 1600°C (in inert/reducing atmospheres) and up to 1400°C in oxidizing conditions.

• Outperforms graphite (which oxidizes above 600°C) and alumina (softens at high temps).

4. Superior Chemical Resistance

• Resists corrosion from molten metals (Al, Cu, Zn), salts, and slags.

• More durable than graphite when exposed to reactive metals like aluminum or silicon.

5. Mechanical Strength & Durability

• High hardness (~9.5 Mohs) and compressive strength reduce wear and deformation.

• Longer lifespan than clay-graphite or quartz crucibles.

6. Oxidation Resistance

• Forms a protective SiO₂ layer in air, preventing rapid degradation (unlike graphite, which erodes).

7. Non-Wetting Surface

• Minimizes sticking of molten metals, allowing easier pouring and cleaning.

8. Energy Efficiency

• Faster heat transfer reduces energy consumption in melting applications.

Applications of SiC Crucibles:

• Metal Melting & Casting (Al, Cu, Zn, precious metals)

• Semiconductor Processing (Si, GaAs crystal growth)

• Glass & Ceramic Production

• High-Temperature Chemical Reactions

SiC crucibles are ideal for high-temperature, high-performance applications where durability, thermal shock resistance, and chemical stability are critical. They outperform traditional crucible materials in harsh environments but come at a higher initial cost.