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| Properties of Silicon Nitride （Si3N4) Ceramics | ||
| Item | Unit | Typical Values |
| Physical Properties | ||
| Density | g/cm3 | 3.2 |
| Mechanical Properties | ||
| Moh's hardness | Grade | 9 |
| Rockwell Hardness | HRA | 90 |
| Vickers Hardness (Hv50) | HV0.5 | ＞1550 |
| Modulus of Elasticity | Gpa | 290 |
| Flexural Strength | Mpa | ＞600 |
| Compressive Strength | Mpa | 2500 |
| Fracture toughness | Mpam1/2 | ＞6.0 |
| Thermal Properties | ||
| Maximum use temperature | °C | 1200 |
| Thermal Conductivity | W/(m.k) | 15-20 |
| Thermal Expansion Coefficient | 10-6/°C | ＞3.1 |
| Thermal Shock Resistance | △T°C | 500 |
| Specific Heat Capacity | KJ/kg.K | 700 |
| Electrical Properties | ||
| Dielectric Strength | KV/mm | 15 |
| Dielectric Constant | Er | |
| Volume Resistivity at 20°C | Ω.cm | 1.0X1012 |
Design Features
Ultrathin silicon nitride ceramic sheets, also known as ultrathin ceramic separators or high-temperature, corrosion-resistant, insulating silicon nitride sheets, are an advanced material solution designed for high-temperature and harsh environments. These sheets combine the excellent physical and chemical properties of silicon nitride, providing an ideal material choice for a variety of industrial applications.
Ultra-thin design
This design not only reduces the weight of materials but also allows for efficient use in compact spaces, improving the flexibility of equipment design and overall efficiency.
High mechanical strength and hardness
The high hardness (1500 Hv0.5) and elastic modulus (290 GPa) of silicon nitride ensure that the structure maintains its integrity and stability under extreme conditions.
Excellent thermal properties
Its low coefficient of thermal expansion (3.1×10-6/℃) enables it to remain stable in environments with drastic temperature changes, making it suitable for use as a lining for heat exchangers and high-temperature furnaces.
Chemical stability and corrosion resistance
Silicon nitride exhibits extremely high resistance to a variety of chemicals, making it suitable for chemical processing environments.
Application areas
Heat Exchangers
Utilizing their high thermal conductivity and thermal stability, they are used as partitions in heat exchangers to improve energy efficiency and thermal management performance.
Combustion chamber lining
Used in high-temperature environments such as combustion chambers, it provides heat resistance and protection, extending equipment life.
Semiconductor Manufacturing
In semiconductor manufacturing, especially when handling high-temperature processes, it is used to protect and isolate sensitive components from thermal damage and chemical corrosion.
