​Pressureless Sintered Silicon Carbide (SSiC) Thermocouple Protection Tubes

Description:

Pressureless sintered silicon carbide (SiC) thermocouple protection tubes are high-performance ceramic tubes fabricated from high-purity SiC using a pressureless sintering process. Their key advantages include high strength, exceptional high-temperature resistance, superior corrosion resistance, and excellent thermal shock resistance, making them ideal for temperature measurement in extreme industrial environments. They provide long-term, stable protection for thermocouples against physical and chemical degradation.

Typical application:

1. Metallurgy
   • Temperature measurement in molten steel, iron, copper, and aluminum, replacing traditional metal tubes to reduce replacement costs.
2. Chemical and Energy Industries
   • High-temperature gas turbines, waste incinerators, and sulfur incinerators operating in corrosive gas environments.
3. Ceramics and Glass Manufacturing
   • Internal temperature monitoring in glass furnaces and ceramic kilns to ensure process stability.
4. Semiconductors and New Energy
   • Temperature control in high-temperature reactors and salt bath furnaces used in lithium-ion battery and photovoltaic production.

Feature:

1. High-Temperature Resistance
   • Maximum operating temperature: Up to 1,650°C in air and 1,900°C in inert gases, significantly exceeding traditional metal protection tubes (e.g., stainless steel, which withstands only 600–800°C).
   • Thermal stability: Maintains a flexural strength of 380 MPa, preventing deformation or fracture under high temperatures.
2. Corrosion and Oxidation Resistance
   • Chemical stability: Resistant to strong acids (e.g., hydrochloric, nitric, sulfuric acid) and molten metals (e.g., Zn, Sn, Pb) without corrosion, with oxidation resistance surpassing that of alumina ceramics (7× stronger at 1,300°C).
   • Erosion resistance: Suitable for environments containing oxygen, sulfur, tar, and other corrosive media, such as high-temperature combustion gases and fuel oils.
3. Thermal Shock and Wear Resistance
   • Coefficient of thermal expansion: 4.85 × 10⁻⁶/°C, closely matching metal thermocouples to minimize cracking risks caused by thermal expansion mismatches.
   • Wear resistance: Vickers hardness of 2350 kg/mm², enabling resistance to high-velocity fluid or particle erosion for extended service life.
4. Thermal Conductivity
   • Thermal conductivity: 160 W/(m·K), ensuring rapid heat transfer to the thermocouple for short response times and high measurement accuracy.

The physical properties of pressureless sintered silicon carbide ceramics products:

Available product sizes:

   Maximum operating temperature: 1,650°C.

   Maximum length: 3 meters.

   Maximum outer diameter: 190 mm.