Precision Silicon Nitride Ring for Sealing, Wear, and High-Temperature Stability
ADCERAX is a professional manufacturer of silicon nitride rings (Si₃N₄), providing standard and custom solutions for sealing, bearing, and wear-resistant applications.
Our factory combines engineering design, precision machining, and strict quality control to ensure every ring meets exacting flatness, roundness, and Ra surface standards. With competitive pricing, fast delivery, and technical co-design, we help OEMs worldwide enhance reliability and minimize downtime.
🤝Partner with ADCERAX today to get high-performance silicon nitride rings built precisely to your drawing.
What is Silicon Nitride Ring?
Silicon nitride ring is a precision-machined ceramic component made from Si₃N₄, a high-performance engineering material known for its exceptional combination of strength, hardness, low density, and thermal shock resistance.
These rings are commonly used in mechanical seals, bearings, pumps, compressors, and vacuum systems, where conventional metals or plastics cannot withstand high temperature, friction, or corrosive environments.
Silicon Nitride Ring vs. Metal Ring
| Parameter | Silicon Nitride Ring (Si₃N₄) | Metal Ring (Alloy Steel) | User Benefit |
| Density | ~3.2 g/cm³ | ~7.8 g/cm³ | 60% lighter → reduces rotational inertia & energy loss |
| Hardness (Vickers) | 1400–1700 HV | 200–800 HV | Superior wear resistance and scratch durability |
| Flexural Strength | ≥800 MPa | 600–900 MPa | Maintains strength under load at high temperature |
| Thermal Expansion (CTE) | 2.8–3.2 ×10⁻⁶ /K | 10–17 ×10⁻⁶ /K | Stable geometry → minimal distortion during heat cycles |
| Working Temperature | Up to 1000 °C (non-oxidizing) | ≤400 °C | Ideal for high-temperature sealing and bearing systems |
| Corrosion Resistance | Excellent in acids, alkalis, gases | Moderate, prone to rust | Long-term reliability in harsh or wet environments |
Silicon Nitride (Si3N4) Ring Properties
Silicon nitride (Si₃N₄) rings feature high hardness, low density, and excellent heat and wear resistance. They stay stable under high speed and temperature, making them ideal for mechanical seals, bearings, and other demanding industrial applications.
Silicon Nitride Ring Technical Sheet
| Si3N4 Type | Gas pressure sintering Si3N4 | Hot pressing sintering Si3N4 | High thermal conductivity Si3N4 |
| Density (g/cm3) | 3.2 | 3.3 | 3.25 |
| Flexture strength (MPa) | 700 | 900 | 600~800 |
| Young Modulus (GPa) | 300 | 300 | 300~320 |
| Poisson’s ratio | 0.25 | 0.28 | 0.25 |
| Compressive strength (MPa) | 2500 | 3000 | 2500 |
| Hardness (GPa) | 15 | 16 | 15 |
| Fracture toughness (MPa*m1/2) | 5~7 | 6~8 | 6~7 |
| Maximum working temperature (℃) | 1100 | 1300 | 1100 |
| Thermal conductivity (W/m*K) | 20 | 25 | 80~100 |
| Thermal expansion coefficient (/℃) | 3*10-6 | 3.1*10-6 | 3*10-6 |
| Thermal shock resistance (ΔT ℃) | 550 | 800 | / |
Advantages of Silicon Nitride Rings
Si₃N₄ rings provide strength and stiffness, maintaining geometry under load and speed. They suit sealing and bearing parts that need stable dimensions and tight tolerances.
Operates reliably up to 1000 °C, with very low thermal expansion. Silicon nitride rings remain stable during rapid temperature changes, ensuring dependable performance in thermal cycling environments.
Hardness above 1500 HV and chemical inertness make Si₃N₄ rings resistant to abrasion, oxidation, and corrosive gases or fluids—perfect for pumps, compressors, and vacuum systems.
At only 40% the density of steel, silicon nitride rings reduce rotational inertia, friction, and energy loss. This lightweight design improves equipment efficiency and extends service life.
Silicon Nitride Ring Products
ADCERAX produces precision silicon nitride ceramic rings with precise dimensions and smooth surfaces for sealing, bearing, and wear applications. Each ring is engineered for high strength, heat resistance, and long service life in demanding industrial environments.
Silicon nitride seal rings are made from high-purity Si₃N₄ ceramic, offering excellent strength, hardness, and dimensional stability. Each ring is precisely machined and polished to achieve a smooth sealing surface, low friction, and long service life in pumps, compressors, and mechanical seal systems.
- Precision-machined sealing faces for tight leakage control
- Excellent thermal shock and wear resistance
- Custom sizes and surface finishes available
Silicon nitride insulation rings provide excellent electrical insulation, high mechanical strength, and thermal stability. They remain reliable under high temperature and vacuum conditions, preventing leakage and maintaining dimensional accuracy in power modules and furnace systems.
- High dielectric strength and thermal resistance
- Stable in vacuum and high-temperature environments
- Custom dimensions for power and thermal applications
🚀Precision Si₃N₄ Rings — Seal Stronger. Last Longer. Perform Better.
Each silicon nitride ring is engineered for high strength, heat resistance, and dimensional stability under extreme load and speed. Designed for sealing, bearing, and wear systems, ADCERAX delivers consistent precision, fast customization, and reliable global supply.
Silicon Nitride Ring Applications
Si₃N₄ rings are widely applied in mechanical seals, pump systems, industrial bearings, high-temperature furnaces, and precision instruments, serving as critical components for sealing, wear protection, insulation, and structural support in demanding environments.
Mechanical Seals & Pumps
Application: Silicon nitride seal rings are applied in chemical pumps, vacuum pumps, and process compressors to maintain leak-free sealing under high load and corrosive conditions.
Challenges: Metal and carbide rings suffer from corrosion, erosion, and dimensional drift in aggressive chemical environments, leading to frequent replacement and downtime.
🧩ADCERAX Solution:
ADCERAX manufactures Si₃N₄ seal rings with chemical inertness, fine-ground sealing faces (Ra ≤ 0.2 μm), and high flexural strength (>800 MPa). These ensure stable sealing performance in acids, alkalis, and solvents.
Case Example: A German pump manufacturer replaced tungsten carbide rings with ADCERAX silicon nitride seal rings. The wear rate dropped by 60%, and the mean time between replacement (MTBR) extended from 6 months to 18 months.
Bearings & Rotating Assemblies
Application: Si3N4 bearing rings are used in high-speed spindles, hybrid bearings, and electric motor shafts to reduce friction and thermal distortion.
Challenges: Steel or alumina bearing rings deform at high RPMs and generate excess heat, limiting rotation speed and reducing bearing life.
🧩ADCERAX Solution:
ADCERAX provides Si₃N₄ bearing rings with precise geometry (roundness ≤0.01 mm), lightweight density (3.2 g/cm³), and low CTE (2.8×10⁻⁶/K), ensuring minimal vibration and stable rotation at high speed.
Case Example: A Japanese spindle OEM adopted ADCERAX silicon nitride bearing rings. Rotational speed increased from 30,000 to 45,000 RPM, while bearing temperature dropped by 12 °C under identical load conditions.
High-Temperature & Vacuum Equipment
Application: Silicon nitride insulation rings serve as support and isolation components in vacuum furnaces, hot-pressing systems, and semiconductor equipment.
Challenges: Conventional alumina rings exhibit microcracking and outgassing above 800 °C, contaminating clean environments and reducing thermal stability.
🧩ADCERAX Solution:
ADCERAX produces Si₃N₄ insulation rings with ultra-low porosity and controlled microstructure, stable up to 1000 °C, ensuring low gas emission and long-term insulation integrity.
Case Example: A South Korean vacuum furnace manufacturer integrated ADCERAX Si₃N₄ insulation rings into its chamber fixtures. The operational lifetime doubled, and maintenance frequency decreased by 40%.
Precision Instruments & Engineering Equipment
Application: Custom silicon nitride rings are installed in analytical instruments, alignment systems, and precision measurement tools requiring dimensional stability and electrical insulation.
Challenges: Traditional metal or zirconia rings cause thermal drift and fail to maintain tolerance under cyclic heating or electrical interference.
🧩ADCERAX Solution:
ADCERAX supplies custom Si₃N₄ rings ground to ±0.005 mm tolerance, providing non-conductive, dimensionally stable components ideal for high-accuracy assemblies.
Case Example: A U.S. metrology company replaced metal spacers with ADCERAX custom Si₃N₄ rings in coordinate measuring machines (CMM). Dimensional error was reduced by 35%, improving repeatability during thermal cycling.
Custom Silicon Nitride Rings Manufacturer
ADCERAX specializes in custom silicon nitride rings (Si₃N₄) engineered to match your drawings and performance requirements. We support non-standard dimensions, tight tolerances, and special surface finishes for sealing, bearing, and wear-resistant applications.
Customization Options
Extra-large / Extra-small diameters, non-standard thicknesses, and ultra-long / ultra-short lengths.
Provide higher - level dimensional accuracy and concentricity control than the standard.
Flanges, steps, threads, drilling holes, grooves, etc.
Adjust the material according to the application requirements.
Polish and grind the surface to achieve a specific surface roughness.
Customization Process
Send us your drawing, CAD file, or physical sample with material grade, dimensions, tolerances, and quantity. Our engineers will evaluate the design and provide a detailed quotation with lead time and pricing.
Once the quote is approved, we proceed with sample prototyping (1–50 pcs) if needed, for testing and validation.
After sample approval or direct confirmation, we begin batch manufacturing using CNC machining, sintering, and polishing. All parts undergo dimensional checks, material purity testing, and surface finish inspection.
Finished products are securely packed and shipped via DHL/FedEx/UPS or your preferred method. We support global delivery with full documentation.
ADCERAX – Precision Silicon Nitride Ring Supplier
ADCERAX is a silicon nitride ring manufacturer and supplier from China, offering factory-direct pricing, precise machining, and fast global delivery. With advanced forming, HIP, and grinding processes, we ensure consistent quality and reliable performance for every ring.
Competitive pricing with strict quality control from raw material sourcing to final delivery
Professional team providing comprehensive technical support and collaborative design
Small batch orders to large-scale production with complex geometries and tight tolerances
24-hour response and 24-hour dispatch for standard items, 3-7 weeks for custom orders.
ADCERAX integrates Si₃N₄ ring production, precision machining, HIP sintering, and quality inspection into a unified process. We deliver both standard and custom silicon nitride rings for sealing, bearing, and wear-resistant applications — from prototype to mass production.
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Precision Machining & Dimensional Control
Each Si₃N₄ ring is CNC-ground to meet strict roundness, flatness, and surface finish standards. This ensures smooth sealing performance, stable rotation, and extended service life under heavy load or high speed. -
Batch Consistency & Quality Verification
Every batch is inspected for density, hardness, and microstructure uniformity. Our controlled HIP and polishing processes guarantee consistent performance and reduce failure rates in demanding environments. -
Customization & Engineering Support
We provide custom silicon nitride ring solutions based on drawings or samples, supporting non-standard sizes, tolerances, and surface treatments. ADCERAX's engineering team assists with material selection and packaging, ensuring fast delivery and reliable global supply.
ADCERAX specializes in producing silicon nitride rings (Si₃N₄) using advanced forming, HIP sintering, and precision CNC grinding. Each ring is crafted for high strength, tight dimensional accuracy, and smooth sealing surfaces, ensuring reliable performance under high speed, pressure, and temperature. As a professional Si₃N₄ ring manufacturer, ADCERAX guarantees consistent batch quality, low friction, and long service life — ideal for demanding sealing, bearing, and wear-resistant applications.
| Manufacturing Capabilities Overview | |||
|---|---|---|---|
| Capability Item | Typical Value / Description | ||
| Material Grades | Pressureless or HIP-sintered Si₃N₄ with dense, uniform microstructure. Hardness ≥1500 HV, fracture toughness > 6 MPa·m½, and density ≈ 3.2 g/cm³ — ensuring high strength and thermal stability for sealing, bearing, and wear applications. | ||
| Precision Machining | CNC grinding and lapping achieve inner/outer diameter tolerances within ±0.01 mm and flatness ≤ 0.005 mm. Mirror surface finish up to Ra ≤ 0.2 µm ensures tight sealing, smooth rotation, and reduced leakage or friction. | ||
| Forming & Shaping | Advanced isostatic pressing and pre-sintering enable custom geometries, slots, and chamfers. Tailored shaping supports both standard and non-standard silicon nitride ring dimensions for various industrial assemblies. | ||
| Flatness & Dimensional Control | Controlled sintering minimizes porosity and warpage, maintaining consistent wall thickness and roundness under high mechanical or thermal stress. Ideal for precision-fit sealing and bearing interfaces. | ||
| Surface Finishing | Precision polishing and ultrasonic cleaning deliver defect-free surfaces with low roughness and stable contact. Each Si₃N₄ ring batch is inspected for density, flatness, and dimensional uniformity to ensure consistent assembly performance. | ||
FAQ
They operate reliably up to 1000 °C in air and even higher in inert atmospheres, maintaining mechanical integrity and dimensional accuracy under rapid temperature changes.
Our CNC-ground Si₃N₄ rings maintain ±0.01 mm tolerance, flatness ≤ 0.005 mm, and surface finish up to Ra 0.2 µm, ensuring tight sealing and smooth bearing operation.
Yes. Their combination of low density (~3.2 g/cm³) and high strength (> 800 MPa) minimizes centrifugal stress, making them ideal for high-speed shafts, pumps, and gas compressors.
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Hot pressing provides high density for small batches, while HIP-sintered (Hot Isostatic Pressed) rings offer better uniformity, mechanical strength, and crack resistance — suitable for continuous production.
ADCERAX integrates forming, HIP sintering, CNC grinding, and inspection in-house to ensure stable quality and full traceability. We provide custom silicon nitride rings with tight tolerances, smooth sealing surfaces, and reliable consistency. With factory-direct pricing, fast global delivery, and engineering support, ADCERAX helps OEMs achieve higher performance and lower maintenance costs.
Yes. Silicon nitride (Si₃N₄) rings are widely used as replacements for alumina and carbide rings in high-load, high-speed, and high-temperature systems. Compared with alumina, Si₃N₄ offers higher fracture toughness (5–7 MPa·m½), better thermal shock resistance, and lower thermal expansion, reducing cracking under rapid temperature changes. Compared with tungsten carbide, it is lighter (only 40% of the density) and maintains excellent hardness and chemical stability without corrosion or oxidation.
These advantages make silicon nitride rings ideal for sealing, bearing, and mechanical wear components where strength, durability, and long service life are critical.
Service life depends on the application, but silicon nitride rings often last 3–5 times longer than metal or alumina rings under equivalent load, speed, and temperature conditions.
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