How to Select Silicon Carbide (SiC) for Your Application？

Silicon carbide (SiC) is widely used in:

• High-temperature furnaces
• Chemical processing
• Heat exchangers
• Semiconductor equipment

However, not all SiC materials perform the same.

Incorrect selection leads to:

• Premature failure
• Reduced service life
• Increased maintenance cost

Before selecting SiC, clarify:

• < 1200°C
• 1200–1500°C
• 1500°C

• Oxidizing
• Reducing
• Corrosive (acid / alkali / lithium vapor)

• Static load
• Bending load
• Thermal cycling

These three factors determine material suitability.

Dense pressureless sintered silicon carbide (SSiC) components are widely used in demanding industrial applications requiring:

• high temperature resistance,
• corrosion resistance,
• and long-term structural stability.

Typical applications include:

• kiln furniture,
• high-temperature structural components,
• and chemical processing equipment.

• High temperature (>1400°C)
• Corrosive environments
• Load-bearing structures

• No free silicon
• High density (~3.10 g/cm³)
• High flexural strength (≥380 MPa)

Best for:

• Medium temperature
• Cost-sensitive applications

Limitations:

• Contains free silicon (~10–15%)
• Lower corrosion resistance

Best for:

• Thermal shock resistance
• Lightweight structures

Limitations:

• High porosity (~15%)
• Lower strength

Different applications have different dominant risks:

Risk:

• Creep deformation
• Bending failure

Risk:

• Corrosion
• Material degradation

Risk:

• Atmosphere reaction
• Surface breakdown

Material must match failure mode, not just specs.

Material alone is not enough.

Performance also depends on:

• Span length
• Support method
• Contact conditions

Example:

• Long beam → higher bending stress
• Spring support → localized contact

Conclusion:

Structure + material = system performance

When selecting SiC, focus on:

• Density
• Porosity
• Bending strength
• Thermal conductivity
• Chemical resistance

Avoid relying only on:

Nominal material name
Supplier claims without data

• Choosing RB-SiC for corrosive environments
• Ignoring atmosphere effects
• Oversizing instead of redesigning structure
• Focusing only on temperature

Most failures are caused by:

Mismatch between material and operating conditions

Not by material defects.

We provide:

• Application-based material recommendation
• Structural design input
• Material performance data
• Testing and validation support

If you are selecting SiC materials for:

• Kiln furniture
• Heat exchangers
• Chemical equipment

Contact us with your operating conditions:

• Temperature
• Atmosphere
• Load

We will provide a practical selection recommendation.