Silicon nitride ceramic heater (also known as silicon nitride ignition rod or silicon nitride electric heating element) is a new type of high-efficiency electric heating component. It takes high-performance silicon nitride ceramic as the matrix, with metal heating bodies such as tungsten wire or molybdenum wire embedded inside, and is fabricated by high-temperature co-firing.
Taking advantage of silicon nitride ceramic’s excellent thermal conductivity, heat resistance, electrical insulation and thermal shock resistance, the product delivers comprehensive performances including rapid temperature rise, stable operation at high temperature, corrosion resistance and long service life. It is widely used in gas ignition, industrial preheating, small heating devices and electric heat conversion occasions under high-temperature environments.
Compared with traditional metal heating wires and silicon carbide ignition rods, silicon nitride ceramic heaters feature higher power density, faster response speed and superior aging resistance, making them an ideal choice for modern gas appliances and industrial heating equipment.
| Test item | Unit | Index range |
| Substrate Material | – | Silicon nitride (Si₃N₄) |
| Heating Element Material | – | Tungsten wire / Molybdenum wire (optional) |
| Maximum Surface Temperature (Continuous) | ℃ | 1200 |
| Maximum Surface Temperature (5-Second Pulse) | ℃ | 1300 |
| Time to Reach 1000°C from Room Temperature | S | 3~8 (depending on power) |
| Recommended Power Density | W/cm² | 40~60 |
| Rated Voltage | V | 12, 24, 110, 220 (custom) |
| Rated Power | W | 50~500 (custom) |
| Cold-State Insulation Resistance (500 V DC) | MΩ | ≥100 |
| Hot-State Insulation Resistance (1000°C) | MΩ | ≥1 |
| Dielectric Strength (AC, 1 min) | kV | ≥1.5 |
| Bulk Density | g/cm³ | 3.2 |
| Flexural Strength | MPa | 600～800 |
| Thermal Conductivity | W/(m·K) | 20～25 |
| Coefficient of Thermal Expansion (20–1000°C) | ×10⁻⁶ /K | 3.0～3.5 |
| Ignition Life (On-Off Cycles) | times | ≥100000 |
1. Extremely Fast Heating Rate: Upon power-up, the surface temperature can reach over 1000°C within seconds; it has low thermal inertia and a rapid response.
2. High Maximum Surface Temperature: The continuous operating surface temperature can reach 1200°C, and the peak pulse temperature can reach 1300°C.
3. High Power Density: Compact in size with concentrated heat generation, power density per unit area can reach 40–60 W/cm², making it suitable for installation in confined spaces.
4. Excellent Thermal Shock Resistance: Withstands severe thermal cycling caused by frequent power cycling without cracking or peeling.
5. Strong corrosion resistance: The silicon nitride ceramic matrix exhibits excellent resistance to most acids, alkalis, combustion products, and molten metals, extending service life.
6. Good electrical insulation properties: Insulation resistance exceeds 100 MΩ at room temperature and remains effective at high temperatures, ensuring safe operation.
7. High mechanical strength: Flexural strength can reach 600–800 MPa, capable of withstanding certain levels of mechanical vibration and impact.
8. Long service life: Under normal operating conditions, the ignition lifespan can exceed 100,000 cycles.
9. Environmentally friendly and non-toxic: Free of harmful substances such as asbestos and heavy metals, and compliant with RoHS standards.
1. Gas Appliance Ignition: Ignition components for gas water heaters, gas stoves, gas boilers, and gas ovens.
2. Industrial Burner Ignition: Boiler burners, industrial kilns, asphalt heaters, and exhaust gas combustion systems.
3. Small Electric Heating Devices: Mold preheating, sealing machine heating heads, soldering iron tips, and hot cutting tools.
4. Laboratory Equipment: High-temperature miniature heaters and sample heating for thermal analyzers.
5. Automotive and Diesel Engine Auxiliary Starting: Ignition plugs for air heaters and fuel heaters.
6. Semiconductor and Photovoltaic Equipment: Localized heating for Rapid Thermal Processing (RTP).
