Alumina Ceramic Threaded Tubes Heat-resistant Alumina Threaded Ceramic Tubes for Industrial Kilns and Furnaces

Alumina ceramic threaded tubes are tubular components made of high-purity alumina (Al₂O₃) ceramic material and feature a threaded structure on both the inner and outer surfaces.
When selecting ceramic threaded tube, consider the following parameters:

• Alumina purity: Common values include 95%, 99%, 99.5%, and 99.7%. Higher purity generally improves temperature resistance, corrosion resistance, and insulation, but also increases cost.
• Dimensions: Outer diameter, inner diameter, length, and thread size.
• Operating temperature: The long-term operating temperature and maximum operating temperature.
• Compressive/flexural strength: The ability to withstand external pressure.
• Airtightness: When used as a protective tube, high airtightness is required to prevent the intrusion of media.

Alumina ceramic threaded tubes are high-performance industrial components designed to withstand extreme operating conditions (high temperatures, wear, and corrosion).

Alumina ceramic tubes inherently possess a range of exceptional properties, which, combined with a threaded design, offer unique advantages:
1. Extremely high wear resistance: Extremely high hardness (Rockwell hardness HRA80-90), second only to diamond and silicon carbide. They effectively resist erosion from solid particles, powders, and airflow, extending their service life far beyond that of metal pipes.

2. Excellent corrosion resistance: They are highly resistant to most acids, alkalis, solvents, and corrosive gases, resisting rust and aging, making them suitable for corrosive environments such as the chemical and pharmaceutical industries.

3. Excellent high-temperature resistance: They can operate at temperatures up to 1500°C for extended periods and withstand even higher temperatures for short periods. They also have a low coefficient of thermal expansion and excellent thermal stability.

4. High insulation: They are an excellent electrical insulating material, suitable for applications requiring insulation, such as protective tubes for electric heating elements.

Benefits of a threaded design for ceramic tubes:

• Easy connection and sealing: Threads allow for easy connection to metal or other ceramic components, creating removable piping systems. 
• Increased Surface Area: Internal threads can disturb the fluid somewhat, enhancing heat transfer efficiency (but also increasing flow resistance).
• Mechanical Locking: When used to secure thermocouples, threads provide a better mechanical fixation.

Due to these properties, alumina ceramic threaded tubes are indispensable in the following areas:

• High-temperature thermocouple protection tubes: This is the most common application. Thermocouple wires are threaded into the tube and fixed via threads in high-temperature environments such as boilers, furnaces, heat treatment equipment, and glass melting furnaces. This allows for direct temperature measurement of molten metal, glass, or hot gases, protecting the thermocouple from corrosion, erosion, and physical damage.
• Wear and corrosion-resistant conveying pipes: Used for conveying abrasive powders (such as fly ash, alumina powder, and cement), granules, or corrosive fluids. Commonly found in pneumatic conveying systems, chemical pipelines, and mineral processing equipment.
• High-temperature furnace components: Serving as draft tubes, sight tubes, air intake ducts, or support sleeves for heating elements within the furnace.
• Semiconductor industry: Used in diffusion furnaces and CVD (chemical vapor deposition) equipment to convey high-purity process gases and prevent metal contamination.
• Research and experimental equipment: Serves as a key component in experimental setups requiring high temperatures, corrosion resistance, and insulation.