Performance of Silicon Carbide Thermocouple Protection Tube
- Long-term use temperature can reach 1600℃
- Withstand rapid and extreme temperature fluctuations
- Resistant to molten metal, strong acid and alkaline corrosion
- Fast thermal conductivity and high precision
- High mechanical strength and long service life
- Resistant to abrasion from particulate matter or flowing media
Silicon Carbide Thermocouple Protection Tube with Various Types
According to different application environments and operating temperatures, Newthink recommend different materials of protective tubes.
Overall balance of properties. Provide cost-effective solution for wide range of applications.
Suitable for temperature measurement of molten metals like aluminum, copper, and zinc.
Exceptional high-temperature strength and superior resistance to corrosion.
Different Types of Silicon Carbide Thermocouple Protection Tube
Newthink provides SiC thermocouple protection tubes in different types, satisfying your specific needs.
Straight Tube TypeStandard single-layer SiC protection tubes, suitable for most industrial furnaces. Customize available.
Special-Shaped PipeCustomized end (threaded, flange connection) to meet the installation requirements of special equipment.
One-Piece with Thermocouple SleevePre-buried K-/S-type thermocouple, reducing installation errors.
Why Choose Newthink Silicon Carbide Thermocouple Protection Pipe?
Choose Newthink because we can provide high-performance, high-flexibility, and cost-effective silicon carbide protection tubes, while solving your supply chain stability and after-sales concerns.
Customizable special-shaped structures, composite coatings, and diversified sizes.
Raw material cost advantage, localized production, and lower prices than European and American counterparts.
ISO certified, strictly control each process to ensure stable and reliable product quality.
Own factory, support small batch orders.
Large-sized silicon carbide panels use plywood boxes, containing foam boards and filling pads.
Professional international sales team, experienced and timely response.
Custom SiC Thermocouple Protection Tube
The size of the silicon carbide thermocouple protection tube needs to be customized according to the thermocouple type and industrial furnace structure:
- Small-diameter type (suitable for precision temperature measurement):
Outer diameter: 6mm, 8mm, 10mm
Wall thickness: 1.5mm~2.5mm (can be thickened to 3mm for high mechanical strength requirements) - Standard type (general industrial scene):
Outer diameter: 12mm, 15mm, 18mm, 20mm
Wall thickness: 2mm~4mm (corrosion-resistant/anti-scouring design) - Large-diameter type (high load or composite sleeve):
Outer diameter: 25mm, 30mm, 40mm
Wall thickness: 4mm~6mm (suitable for metallurgical molten steel temperature measurement) - Length (L): 300-1800mm
Resource
Download detailed product specifications, technical data and more. Access all the information you need.
Meet Us at Exhibitions and Factory Visits
Newthink actively participates in major industrial and advanced ceramics exhibitions worldwide throughout the year, such as Italy, Germany, Japan, and Vietnam, meeting directly with our customers.
Newthink welcome you to visit our factory, witnessing firsthand our dedication to quality. Through frequent interactions in global events and visits, we’ve earned deep trust from clients in over 40 countries and regions.
Parameters for Different Types of Silicon Carbide Thermocouple Protection Pipe
In order to adapt to different application scenarios, we provide silicon carbide thermocouple protection tubes made of the following materials.
- Data Sheet
Item | Unit | Data | |||
| RBSiC(SiSiC) | NBSiC | SSiC | RSiC | ||
| Max service temperature | ℃ | 1380 | 1450 | 1650 | 1620 |
| Density | g/cm3 | 3.02 | 2.75-2.85 | 3.08-3.16 | 2.65-2.75 |
| Open porosity | % | 0 | 13-15 | 0 | 15-18 |
| Bending strength 20℃ | Mpa | 250 | 160 | 380 | 100 |
| Bending strength 1200℃ | Mpa | 280 | 180 | 400 | 120 |
| Modulus of elasticity 20℃ | Gpa | 330 | 580 | 420 | 240 |
| Modulus of elasticity 1200℃ | Gpa | 300 | / | / | 200 |
| Thermal conductivity 1200℃ | W/m.k | 45 | 19.6 | 100-120 | 36.6 |
| Coefficient of thermal expansion | K-1x10-6 | 4.5 | 4.7 | 4.1 | 4.69 |
| HV | kg/mm2 | 2115 | / | 2800 | / |
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① Protective tubes must be used: Insulate the thermocouple with high temperature and corrosion resistant materials such as silicon carbide ceramic protective tubes and protect from the hostile media.
② Mechanical damage must be avoided: Avoid areas which can experience vibration or shock when installed.
Thermocouple protection tubes are typically made of high temperature resistant material and corrosion resistant material, such as metal or ceramic (silicon carbide). The material is selected depending on operating temperature and the environment.
Thermocouple sleeves are usually independently installed metal hollow tubes, which are fixed on equipment by threading or flanges, and are mainly used to seal high-speed and high-pressure liquids, and to plug and replace thermocouples
The protective tube is comprised mostly of ceramic materials like silicon carbide, which is sleeved directly on the outside of the thermocouple. It predominantly serves as high temperature resistance, corrosion resistance, and protection of mechanics, and is usually applied in extreme environments like furnaces and heat treatment.
① Acid resistance: Excellent (resistance to non-oxidizing acids such as hydrochloric acid and sulfuric acid);
② Alkali resistance: Poor (readily corroded by strong alkalis such as NaOH and KOH at high temperatures).
Yes, but there are specific temperature limits depending on the environment. Beneath vacuum condition, SiC protection tube will perform very well. They can reach just below 1900℃ when in a vacuum condition as there will be no oxidation. In reducing gases, for example nitrogen, they should remain below around 1300℃ temperature limits to avoid reaction chemistry that may weaken the material.
Handle a silicon carbide thermocouple protection tube with care to prevent breakage. Take care and remember not to apply mechanical or thermal stress. Ensure that the installation holes are clean and smooth, properly aligned and allow for enough clearance around the tube to allow for thermal expansion. When matching fixtures to the tube, use a soft high temperature sealing material like ceramic fiber, avoid rigid fittings.
Never force the tube into place or overtighten any clamps. After installation, you need to go through the process of a slow first heat-up starting at a low temperature and slowly increasing the temperature.
Silicon carbide thermocouple protection tubes can vary considerably in length of service dependent on the industrial working environment. In general, in fairly stable working conditions without too much temperature variability and clean atmospheric conditions present, they can last for several years of service. In much harsher environments involving corrosive gases, high heat or thermal cycling at all, the lifespan gets shortened to several months. Most longer life factors are dependent on working temperature, the working atmosphere in the furnace, installation quality and moisture.
