What is silicon nitride ceramic (Si3N4)?
Silicon Nitride (Si3N4) is a high melting point ceramic material that is extremely hard and chemically inert. Moreover, silicon nitride ceramics have a low coefficient of thermal expansion, high thermal conductivity and excellent thermal shock resistance. Therefore, it is often utilized to manufacture mechanical components such as bearings, gas turbine blades, mechanical sealing rings, and permanent molds.
Silicon nitride chemical formula:
The chemical formula for silicon nitride is Si3N4.Molecular weight is 140.28, dissolved at 1900°C under pressure, and the color is usually gray or gray-black after high temperature sintering.
Hardness of silicon nitride ceramics:
Silicon nitride ceramics have a Mohs hardness of 9 to 9.5 and a Vickers hardness of about 1550, making them one of the hardest substances in the world.
What are the silicon nitride ceramic parts?
Silicon Nitride Ceramic Arbor
High hardness and wear resistance
Silicon Nitride Ceramic Triangular Block
Professional manufacturer Customized
Silicon Nitride Ceramic Balls
Polishing process up to Ra0.002mm mirror effect
Silicon Nitride Ceramic Parts
Non-standard customization of shaped ceramic parts
Silicon Nitride Ceramic Substrates
Precision machining of silicon nitride ceramic substrates
Silicon Nitride Ceramic Bearings
High hardness and wear resistance with self-lubricating properties
Silicon Nitride Ceramic Threaded Fasteners
Silicon Nitride Ceramic Bolts Non-Standard Customization
Silicon Nitride Ceramic Gasket
Machining accuracy up to ±0.001mm
Silicon Nitride Ceramic Tubes
Customized silicon nitride ceramic tubes in various sizes
View MoreSilicon Nitride Ceramic Parts
Performance characteristics of silicon nitride ceramics
Advantages of Silicon Nitride Ceramics
Mechanical Properties of Silicon Nitride Ceramics
| sports event | unit (of measure) | Pneumatic silicon nitride | Hot pressed silicon nitride | High Thermal Conductivity Silicon Nitride Plate |
|---|---|---|---|---|
| color | -- | Gray or black | Gray or black | Gray or black |
| intensity | g/cm³ | 3.2 | 3.3 | 3.25 |
| durometer | GPa | 15 | 16 | 15 |
| compressive strength | MPa | 2500 | 3000 | 2500 |
| bending strength | MPa | 700 | 900 | 600~800 |
| Fracture toughness | MPa・m1/2 | 5~7 | 6~8 | 6~7 |
| Young's modulus | GPa | 300 | 300 | 300~320 |
| Poisson's ratio | -- | 0.25 | 0.28 | 0.25 |
Thermal Properties of Silicon Nitride Ceramics
| sports event | unit (of measure) | Pneumatic silicon nitride | Hot pressed silicon nitride | High Thermal Conductivity Silicon Nitride Plate |
|---|---|---|---|---|
| Maximum operating temperature | ℃(without mechanical load) | 1100 | 1300 | 1100 |
| Thermal conductivity@20℃ | W/(m・K) | 15~20 | 20~25 | 80~100 |
| Coefficient of linear thermal expansion | 40 - 400°C, x 10-6/C | 3 | 3.1 | 3 |
| specific heat | J/(kg・K) | 660 | 650 | 680 |
| thermal shock resistance | ℃ (into water) | 550 | 800 | -- |
Electrical Characteristics of Silicon Nitride Ceramics
| sports event | unit (of measure) | Pneumatic silicon nitride | Hot pressed silicon nitride | High Thermal Conductivity Silicon Nitride Plate |
|---|---|---|---|---|
| dielectric constant | 1MHz | 6~8 | 8 | 7.8 |
| Dielectric strength (6.35mm) | ac-kV/mm | 15 | 17 | -- |
| Volume resistance@20℃ | Ω・cm | ＞1014 | ＞1014 | ＞1014 |
| Volume Resistance@500℃ | Ω・cm | ＞1010 | ＞1010 | ＞1010 |
Note: All the above parameters are typical values of silicon nitride ceramics, please note that they may vary from batch to batch.
Precautions for using silicon nitride ceramics
At not too high a temperature, silicon nitride has high strength and impact resistance, but above 1200 ℃ will be broken with the growth of the use of time, so that its strength is reduced, more likely to fatigue damage above 1450 ℃, so the use of silicon nitride is generally not more than 1300 ℃ temperature.
What are the uses of silicon nitride ceramics?
- Rotary ball and roller bearings;
- Cutting Tools:
- Engine parts: valves, rockers;
- Arm pads, sealing surfaces;
- Induction heating coil holder;
- Turbine blades, vanes, buckets;
- Welding and brazing fixtures;
- Heating element assembly;
- Crucible;
- Metal tube forming rolls and dies
- TIG / Plasma Welding Nozzles
- Welding Positioner
- Precision shafts and axes in high wear environments
- Thermocouple Sheaths and Tubes
- Semiconductor Process Equipment
Silicon Nitride Ceramic Structural Parts Processing
To Good Ceramics is a professional silicon nitride ceramic structural parts processing manufacturer. Since 2013, we have participated in and supplied more than 3,000 precision ceramic products to hundreds of companies.
We can provide you with ceramic machining, ceramic materials, ceramic casting, ceramic metal encapsulation and surface metallization services, and are committed to providing products and services that meet or exceed our customers' quality requirements.
Silicon Nitride Ceramics Manufacturer
To Good Ceramics is your custom silicon nitride ceramics manufacturer, and we can meet your advanced ceramics prototyping needs. We are always happy to utilize our years of advanced ceramics experience to advise on materials, designs and applications. If you are looking to purchase silicon nitride plates, rods, tubes, or custom machined parts, please contact us and one of our experts will be happy to assist you.
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