The Silicon Nitride Heater Protection Tubeis a high-performance ceramic protection tube manufactured from premium silicon nitride (Si₃N₄) material. It is specifically designed for high-temperature, high-thermal-shock and corrosive industrial environments.
Silicon nitride protection tubes are widely used to protect electric heating elements, thermocouples and temperature sensors, providing excellent mechanical strength, thermal stability and long service life under extreme operating conditions.
Compared with alumina protection tubes, quartz tubes and metal protection tubes, thesilicon nitride heater protection tubeoffers superior thermal shock resistance, higher strength at elevated temperatures and significantly longer operational life.
With advanced ceramic manufacturing technology and strict quality control, we provide reliable and high-performance silicon nitride protection tubes to meet the demanding requirements of industrial heating and temperature measurement applications worldwide.
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Item |
Specifications |
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Physical properties |
Density(g/cm3) |
>=3.2 |
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Elastic Modulus(GPa) |
300-320 | |
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Hardness (HV) |
>=12 | |
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Flexural strength(MPa) |
700 | |
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fracture toughness(MPa.m) |
6 | |
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thermal expansivity(x106/k) |
3.2 | |
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Upper temperaturelimit of use(C) |
1200 | |
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Thermal ShockResistance (AT C) |
600-700 | |
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insulativity |
Insulation | |
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Acid and alkalicorrosion resistance |
High | |
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Properties of grinding media |
Particle distribution(mm) |
0.6+0.1mm |
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Filling dense(g/cm3) |
>=1.8 | |
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Average Crushing Load(Kgf) |
>=20 | |
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Sphericity(DS/DL) |
98% | |
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surface self-abrasion(PPm/h) |
1.5 | |
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internal self-abrasion(PPm/h) |
1.7 | |
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Internal porosity(%) |
0.02 | |
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Error rate of particlesize(%) |
0.1 |
The silicon nitride heater protection tube is widely used in:
1. Electric heating element protection
2. Thermocouple protection tubes
3. High-temperature industrial furnaces
4. Laboratory and experimental furnaces
5. Aluminum, zinc and non-ferrous metal melting
6. Semiconductor and electronic material processing
7. Advanced ceramics and powder metallurgy
In these applications, silicon nitride protection tubes effectively isolate heating elements from high temperatures and corrosive environments, improving system safety and service life.
Cersol’s vacuum feedthrough solutions utilize advanced ceramic-to-metal and glass-to-metal sealing techniques, ensuring reliable performance in high and ultra-high vacuum environments.
Key Technical Advantages:
1. Material: High purity Silicon Nitride (Si₃N₄)
2. Maximum Working Temperature: Up to 1200–1400°C (depending on application conditions)
3. Thermal Shock Resistance: Excellent, suitable for rapid heating and cooling cycles
4. Mechanical Strength: High strength maintained even at elevated temperatures
5. Corrosion Resistance: Resistant to molten metals, reducing and neutral atmospheres
6. Electrical Insulation: Suitable for electric heater and sensor protection
The silicon nitride protection tube is especially suitable for applications requiring frequent start-stop operation and long-term continuous heating.
We supply various types of silicon nitride heater protection tubes, including:
1. One-end closed silicon nitride protection tube
2. Both-ends open silicon nitride protection tube
3. Flanged silicon nitride heater protection tube
4. Customized end structures (chamfered ends, sealing grooves, special interfaces)
All silicon nitride protection tubes can be designed according to customer installation requirements.
1. Outer Diameter (OD): Customizable
2. Inner Diameter (ID): Customizable
3. Length: Customizable
4. Dimensional Tolerance: Controlled according to application needs
Non-standard silicon nitride protection tubes are available for special equipment, furnaces and heating systems.
1. Long service life, reduced replacement frequency
2. Excellent resistance to thermal shock and cracking
3. High strength and structural stability at high temperature
4. Ideal replacement for alumina and quartz protection tubes
5. Stable performance in harsh industrial environments
