Reaction Bonded Silicon Carbide (RBSC / SiSiC) Thermocouple Protection Tube
Reaction Bonded Silicon Carbide (RBSC), also known as Silicon Infiltrated Silicon Carbide (SiSiC), is a dense ceramic material featuring excellent gas tightness, high mechanical strength, and outstanding thermal conductivity.
RBSC thermocouple protection tubes are specifically designed for temperature measurement applications where reliable sealing performance is required, including atmosphere furnaces, heat treatment systems, and flue gas monitoring equipment.
Compared with porous silicon carbide materials, RBSC provides a nearly non-porous structure, making it highly suitable for applications requiring protection against gas penetration and chemical atmosphere exposure.
With a continuous service temperature of up to 1350°C, RBSC offers an excellent balance between performance, durability, and cost-effectiveness for medium-temperature industrial furnace applications.
RBSC thermocouple protection tubes are manufactured through a reaction bonding process.
High-purity silicon carbide powder is mixed with carbon materials, formed into the required tube shape, and then subjected to controlled drying and debinding.
During high-temperature silicon infiltration, molten silicon penetrates into the porous structure and reacts with carbon to form secondary silicon carbide. The remaining silicon fills the residual pores, creating a fully dense composite structure.
This process provides:
- Nearly zero open porosity
- Excellent gas tightness
- High dimensional accuracy
- Low manufacturing shrinkage
- Stable mechanical properties
- High production efficiency
The presence of residual free silicon provides excellent densification and processing advantages while defining the maximum recommended operating temperature range.
The dense microstructure prevents gas penetration, making RBSC tubes suitable for:
- Atmosphere-controlled furnaces
- Gas analysis systems
- Sealed temperature measurement applications
RBSC provides excellent resistance against:
- Mechanical impact
- Installation stress
- Long-term thermal loading
High thermal conductivity enables:
- Faster temperature response
- More accurate temperature measurement
- Reduced thermal gradients
The reaction bonding process results in:
- Low shrinkage during manufacturing
- Accurate dimensions
- Consistent tube geometry
Compared with advanced sintered SiC materials, RBSC provides an economical solution for many medium-temperature applications.
| Property | Value |
|---|---|
| Material | Reaction Bonded Silicon Carbide (RBSC / SiSiC) |
| SiC Content | Approximately 81% |
| Maximum Service Temperature | 1350°C (SK grade) / 1380°C (high-silicon SKD grade) |
| Bulk Density | 3.00–3.05 g/cm³ |
| Apparent Porosity | 0% (Gas-tight structure) |
| Flexural Strength (Room Temperature) | 260–300 MPa |
| Flexural Strength (1400°C) | 180–200 MPa |
| Elastic Modulus | 300–340 GPa |
| Thermal Conductivity (1000°C) | 35–36 W/m·K |
| Thermal Expansion Coefficient | 4.4–4.5 ×10⁻⁶/°C |
| Thermal Shock Resistance | Excellent |
| Standard Outer Diameter | Φ12–40 mm |
| Standard Inner Diameter | Φ4–20 mm |
| Standard Length | Up to 1200 mm |
| Gas Tightness | Fully dense / suitable for gas sampling |
| Custom Dimensions | Available upon request |
RBSC thermocouple protection tubes are widely used in industrial environments requiring reliable temperature measurement and excellent sealing performance.
Typical applications include:
Suitable for:
- Carburizing furnaces
- Nitriding furnaces
- Protective atmosphere systems
Used in:
- Industrial combustion systems
- Waste treatment facilities
- High-temperature gas analysis equipment
Including:
- Steel heat treatment
- Non-ferrous metal processing
- Foundry furnace temperature monitoring
Applications include:
- Petrochemical furnaces
- Coal chemical equipment
- Power generation systems
RBSC is an excellent choice when the application requires:
✔ Excellent gas tightness
✔ High mechanical strength
✔ Fast thermal response
✔ Stable dimensional performance
However, for continuous operation above 1400°C or highly oxidizing high-temperature environments, alternative materials such as:
- Recrystallized SiC (R-SiC)
- Pressureless Sintered SiC (SSiC)
may provide better long-term performance.
| Material | Max Service Temperature | Gas Tightness | Main Advantage |
|---|---|---|---|
| RBSC / SiSiC | 1350°C | Excellent | Gas sealing and mechanical strength |
| Si₃N₄-Bonded SiC | 1450°C | Medium | Thermal shock resistance |
| R-SiC | 1650°C | Moderate | Oxidation and sulfur resistance |
| SSiC | 1650°C | Excellent | Corrosion resistance and high performance |
- Advanced reaction bonding technology
- Stable material performance
- Excellent gas sealing capability
- Customized dimensions available
- Suitable for various industrial furnace applications
- Professional technical support for material selection
Kegu provides customized Reaction Bonded Silicon Carbide (RBSC / SiSiC) Thermocouple Protection Tubes for industrial furnaces, gas analysis systems, and high-temperature measurement applications.
Contact our engineering team for technical consultation and customized solutions.
Miss. Scarlett.S
Deputy Head of Foreign Trade Department
- Email: scarlett.s@kegugroup.com
- Tel: 8616602956098
- WhatsApp: 8613390790728
-
WeChat:
Scarlettseren533
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