Product Introduction of Silicon Nitride Ceramic Parts
Silicon nitride ceramic (Si₃N₄) is a high-performance engineering ceramic material, particularly suitable for high-speed rotating parts, possessing the following significant characteristics:
1. Low Density: The density is only 3.20 g/cm³ (approximately 40% of bearing steel), resulting in low centrifugal force during high-speed rotation, which significantly increases the speed limit.
2. High Hardness and Strength: Hardness reaches HV10 1480, with high fracture toughness, enabling it to withstand extreme load conditions.
3. High Temperature Resistance: It maintains its original hardness up to 400℃, and its performance only begins to decline above 800℃. It can be used up to 1000℃ (in air) or 1400℃ (in a protective atmosphere).
4. Excellent Thermal Stability: It has a low thermal expansion coefficient (3.2×10⁻⁶/℃), a thermal conductivity of 20-25 W/m·K, and good thermal shock resistance.
5. Self-Lubricating Properties: It has a low coefficient of friction and can be used in environments without lubricating media, reducing friction loss.
6. Chemical Stability: It is resistant to most acids and bases (except hydrofluoric acid and concentrated strong bases).
Product Types
1. Silicon Nitride Ceramic Bearings: Including hybrid ceramic bearings (ceramic balls + metal rings) and all-ceramic bearings.
2. Ceramic Bushings/Sleeves: Used in high-precision transmission systems.
3. Spacer Rings: Used in high-load, high-speed environments to increase the distance between friction pairs.
4. Ceramic Balls/Rollers: Diameters ranging from a few millimeters to tens of millimeters.
5. Precision Structural Components: Customized machining of various high-speed rotating parts.
Technical Parameters
Parameter Name | Typical values | illustrate |
density | 3.20 g/cm³ | Approximately 40% of that of steel. |
hardness | HV10 1480 | Second only to diamond and cubic boron nitride. |
Flexural strength | 600-850 MPa | It is more than twice the amount of aluminum oxide. |
fracture toughness | 5-7 MPa·m½ | Good impact resistance. |
Coefficient of thermal expansion | 3.2×10⁻⁶/℃ | Dimensionally stable with temperature changes. |
Thermal conductivity | 20-30 W/m·K | Excellent heat dissipation performance. |
Maximum operating temperature | 1000℃(空气) | 1400℃ (protective atmosphere) |
Application areas
Silicon nitride ceramic components are used in the following high-end applications:
Application areas | Specific applications | Advantages demonstrated |
Aerospace | Jet engine bearings, turbine bearings | High temperature resistance, low density, and high rotational speed stability. |
Precision manufacturing | High-speed machine tool spindle bearings | High precision, low thermal expansion, long lifespan |
New energy vehicles | Motor bearings | Reduce friction losses and improve efficiency. |
Energy equipment | Wind turbine bearings | Weather resistance, long maintenance cycle |
Medical devices | High-speed centrifuge bearings | Low noise, high reliability |
Semiconductor equipment | Vacuum pump bearing | Corrosion-resistant and non-polluting. |
Supports custom specifications.
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