Performance parameters of silicon nitride ceramics

Silicon nitride ceramics (Si₃N₄) are one of the most advanced structural ceramics with excellent comprehensive performance, known for their outstanding thermal shock resistance, high fracture toughness, and excellent mechanical strength. This material has irreplaceable advantages in the fields of high-temperature structural components, bearings, and cutting tools.

About Silicon Nitride Ceramic

Silicon nitride ceramics are made from silicon (Si) and nitrogen (N) through reaction sintering (RBSN) or hot pressing sintering (HPSN) processes, and have a unique β - phase columnar crystal structure, 

endowing them with:

High fracture toughness (3 times that of alumina ceramics)

Excellent thermal shock resistance

Excellent creep resistance performance

According to the sintering process, it can be divided into:

Atmospheric pressure sintered silicon nitride (GPSN): used for complex shaped components

Hot pressed silicon nitride (HPSN): suitable for ultra-high strength requirements

Characteristics of silicon nitride ceramics

physical property

Color: gray black to dark gray

Density: 3.2-3.3g/cm³

Thermal expansion coefficient (25-1000°C): 3.2-3.5 × 10⁻⁶/K

Mechanical properties

Bending strength: 600-1000 MPa (HPSN can reach 1200MPa)

Hardness: 15-16GPa (Vickers hardness)

Fracture toughness: 6-8 MPa · m¹/²

Thermal Properties 

Maximum operating temperature: 1400°C (oxidizing atmosphere)

Thermal conductivity: 15-30 W/(m·K)

Electrical Property

Volume resistivity (20°C):>10Ω·cm

Dielectric constant (1MHz): 8-9

Advantages of cordierite ceramics

✔  Ultimate thermal shock resistance - able to withstand rapid cooling and heating with Δ T>1000°C

✔  Ultra low thermal expansion - close to zero expansion (matched with quartz glass)

✔  Lightweight porous - high porosity (adjustable to 50%) while maintaining structural strength

✔  Chemical inertness - resistant to weak acid/alkali corrosion (excluding HF)

✔  Cost effectiveness - More economical than silicon carbide/zirconia

Typical applications of cordierite ceramics

Automotive Environmental Protection: Diesel Particulate Filter (DPF), Three way Catalytic Carrier (Honeycomb Structure)

Electronics industry: 5G antenna substrate, microwave dielectric components

High temperature filtration: molten metal filter plate, industrial waste gas treatment

Thermal equipment: heat exchangers, low-temperature kiln furniture (<1300°C)

Aerospace field: satellite antenna cover (low dielectric loss)

conclusion

Cordierite ceramic is a benchmark material for ultra-low expansion and high-frequency electronic applications, and its honeycomb structure design is irreplaceable in the field of automotive exhaust treatment. For scenarios that require extreme thermal cycling stability (such as DPF filters) or high-frequency signal transmission (such as 5G base stations), cordierite provides the best cost-effective solution.

Customized service: Supports customization of honeycomb cell density (100-900 CPSI), aperture (0.1-5mm), and size, and provides material performance testing reports!