Core Advantages (Adapted to Thermocouple Application Scenarios)
Ultra-high temperature resistance: It can be used continuously at temperatures up to 1600°C and withstand short-term temperatures of 1800°C, making it suitable for high-temperature industrial scenarios such as metallurgy and ceramics. This performance far exceeds that of metal protection tubes (e.g., stainless steel, which can withstand approximately 800°C).
Superior corrosion resistance: It is stable against chemical media such as strong acids, strong alkalis, and molten metals (e.g., aluminum, copper), preventing the thermocouple electrodes from being corroded and failing. It is applicable to temperature measurement in chemical engineering and molten metal scenarios.
High hardness and wear resistance: With a Mohs hardness of 9 (second only to diamond), it can resist erosion and wear from high-temperature dust and particles, making it suitable for dusty working conditions such as cement kilns and coal-fired boilers.
Low thermal conductivity loss: It has stable thermal conductivity, which reduces temperature measurement lag and ensures the thermocouple's rapid response to temperature changes.
Typical Application Scenarios
Metallurgical industry: Temperature measurement of molten metal in blast furnaces and steelmaking furnaces.
Building materials industry: Temperature measurement in high-temperature areas of cement rotary kilns and glass melting furnaces.
Chemical industry: Temperature measurement in corrosive environments such as strong acid reaction kettles and high-temperature cracking furnaces.
New energy industry: High-precision temperature measurement in high-temperature scenarios such as polysilicon reduction furnaces and lithium battery material sintering furnaces.
Precautions
1. High brittleness: Sapphire is relatively brittle, so severe collision and vibration should be avoided during installation and use. A buffer structure should be used if necessary.
2. High cost: Compared with metal and ceramic protection tubes, sapphire has a higher cost. It is suitable for "high-precision temperature measurement scenarios with rigid demands" under extreme working conditions; other materials should be preferred for ordinary working conditions.
3. Compatibility with thermocouple types: It is often paired with high-temperature noble metal thermocouples such as Type S (Platinum-Rhodium 10-Platinum) and Type B (Platinum-Rhodium 30-Platinum-Rhodium 6) to maximize the advantages of high-temperature measurement.
