Advanced High-Temp Protection Solutions for Thermocouples
Molybdenum disilicide protection tube is a high-temperature ceramic protective component designed for temperature measurement in a severe high-temperature environments.It resists oxidation, thermal shock, and corrosive heat,ensuring it an ideal choice for protecting thermocouples and extending their service life in harsh industrial environments.
Featuring superior mechanical durability and consistent performance at elevated temperatures,MoSi₂ protection tubes ensure dependable performance during prolonged high-temperature operation.These protection tubes are widely utilized across a range of high-temperature processing fields,including industrial furnaces, ceramic kilns, glass manufacturing equipment, heat treatment systems, andvarious thermal processing applications.
Key Features
Excellent High-Temperature Resistance
Designed for extreme thermal environments, MoSi₂ protection tubes deliver reliable performance at ultra-high operating temperatures with superior structural stability.Their exceptional heat resistance ensures them suitable for long-term use in high-temperature furnaces and thermal processing equipment.
Excellent Thermal Shock Resistance and Thermal Stability
Featuring a low coefficient of thermal expansion and excellent heat transfer capability,it can withstand rapid heating and cooling cycles without cracking.
Compared with traditional alumina tubes, which have poor thermal shock resistance and are prone to breakage. Moreover, it also exhibits excellent thermal stability, without any phase transition before reaching the melting temperature.
Outstanding Oxidation Resistance
Under high-temperature operating conditions,MoSi₂ generates a protective silica (SiO₂) layer on the surface,it provides excellent oxidation resistance and substantially extends service life even where operating under severe conditions.
Superior Thermal Shock Resistance
Unlike brittle oxides, the MoSi₂ protection tube benefits from a ductile intermetallic microstructure. This internal architecture lets it absorb rapid thermal transients rather than fracture under stress. Cracking from repeated heating and cooling—common with alumina—is rarely an issue here.
Advantages of MoSi₂ Protection Tubes Over Alumina Tubes
| Performance | Molybdenum Disilicide Protection Tube | Al₂O₃ Alumina Tube |
| Maximum Operating Temperature | Up to 1700°C grade (peak temperature up to 1800°C) | Up to 1700°C grade (peak temperature up to 1800°C) |
| Thermal Shock Resistance | Excellent – withstands rapid heating and cooling cycles without cracking | Poor – vulnerable to thermal shock and cracking during temperature fluctuations |
| High-Temperature Oxidation Resistance | Forms a protective SiO₂ layer on the surface, providing continuous oxidation protection | Chemically stable but has no self-repairing protective mechanism |
| Reducing Atmosphere Compatibility | Applicable in reducing atmospheres (≤1350–1500°C depending on conditions) | Limited application; may suffer from corrosion and performance degradation |
| Gas Tightness | Excellent gas sealing performance | High-purity alumina has good density, while conventional tubes offer average sealing performance |
| Room-Temperature Toughness | Brittle; requires careful handling and vertical installation to prevent impact damage | Brittle and sensitive to mechanical impact |
