会社のニュース What is the Maximum Temperature of Silicon Carbide Ceramics?

Silicon carbide (SiC) ceramics are widely recognized for their exceptional high-temperature performance. In demanding industrial environments, understanding the maximum service temperature of silicon carbide is critical for selecting the right material.

Maximum Temperature of Silicon Carbide

The maximum service temperature of silicon carbide ceramics depends on the environment:

In Air (Oxidizing Atmosphere)

• Up to 1600–1650°C
• Long-term stable operation possible

In Inert or Vacuum Environments

• Up to 2000°C or higher
• Minimal oxidation allows higher thermal limits

Key point:
Silicon carbide maintains mechanical strength and structural stability even at extreme temperatures.

Why Silicon Carbide Withstands High Temperatures

Several intrinsic material properties contribute to its outstanding performance:

1. Strong Covalent Bonding

• Si–C bonds are highly stable
• Resistant to thermal decomposition

2. High Thermal Conductivity

• ~120 W/m·K
• Efficient heat dissipation reduces thermal stress

3. Low Thermal Expansion

• ~4.0 ×10⁻⁶ /K
• Minimizes deformation at high temperatures

4. Excellent Thermal Shock Resistance

• ΔT > 300–350°C
• Withstands rapid heating and cooling cycles

SSiC vs Other SiC Materials

Not all silicon carbide materials perform equally at high temperatures.

Why SSiC is better:

• No free silicon phase
• Higher purity (≥98.5%)
• Near-zero porosity

Typical High-Temperature Applications

Silicon carbide ceramics are widely used in:

Furnace & Thermal Processing

• Kiln furniture
• Setter plates
• Support beams

Semiconductor Industry

• Wafer carriers
• Process tubes
• Heating elements

Chemical Industry

• Reactor components
• Heat exchangers
• Corrosion-resistant structures

Energy & Advanced Systems

• Gas turbines
• Heat recovery systems

Factors That Affect Maximum Temperature

Even though SiC can handle extreme heat, real-world limits depend on:

1. Atmosphere

• Oxygen → oxidation limits temperature
• Inert gas → higher tolerance

2. Mechanical Load

• High stress at high temperature reduces lifespan

3. Exposure Time

• Short-term vs long-term temperature limits differ

4. Material Quality

• Density ≥ 3.05 g/cm³ improves performance
• Lower porosity = better durability

Common Misconceptions

“All ceramics handle high temperature equally”
→ False. SiC significantly outperforms most oxide ceramics

 “Maximum temperature = safe working temperature”
→ Not always. Long-term use requires lower limits

Conclusion

Silicon carbide ceramics offer one of the highest temperature capabilities among engineering materials:

~1650°C in air
Up to 2000°C in inert environments

Among different types, SSiC provides the best high-temperature stability, making it the preferred choice for demanding industrial applications.

Need Help Selecting High-Temperature SiC Components?

For optimal performance, selecting the right SiC grade depends on:

• Operating temperature
• Atmosphere (air, vacuum, inert gas)
• Mechanical load
• Component design

Providing these details allows for more precise material recommendations and longer service life.