Siliconic Carbide Rings

Crafted with silicon carbide’s ultra-high hardness and thermal stability, our rings deliver superior sealing and wear resistance in extreme environments. Designed for high-temperature, high-corrosion scenarios, they maintain structural integrity under relentless industrial stress.

Ring Types Kedel Provides for You

Silicon carbide rings, leveraging extreme hardness (2500–3000 HV) and chemical inertness, serve as critical components in aerospace, semiconductor, chemical, and high-temperature engineering sectors. Their ability to withstand ultra-high temperatures (up to 1600°C) and aggressive media makes them indispensable for enhancing equipment durability in harsh conditions.

Application Scenarios of Rings

With unparalleled hardness and corrosion resistance, silicon carbide rings excel in industrial realms demanding extreme performance. From aerospace engines to corrosive chemical systems, their applications redefine the boundaries of material reliability.

Mechanical Sealing Field

Oil and Gas Drilling Industry

Chemical Equipment

Mechanical Engineering Field

Metal Rolling Scenarios

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What is a Silicon carbide ring?

Silicon carbide rings are critical in industries demanding extreme material performance. In semiconductors, their purity and corrosion resistance ensure contamination – free etching/deposition. In chemical plants, they provide leak – proof sealing for pipelines/valves handling strong acids, alkalis, and superheated fluids, especially excelling in high – pressure sealing scenarios.

Manufacturing uses advanced ceramic processing. 99% – pure silicon carbide powder mixes with a sintering aid (e.g., aluminum oxide/carbon). Compressed into a pre – ring shape under 300 MPa, it sinters at 2000 – 2200°C in an inert atmosphere to form a dense, pore – free structure. Post – sintering, grinding/lapping/cutting refines dimensions for industrial needs, which is beneficial for precise high – pressure sealing applications.

Thanks to outstanding performance, these rings are widely used in critical equipment. In semiconductors, they reduce corrosion – related downtime in wafer processing and CVD chambers. In chemical processing, they seal reactor agitators and petrochemical valve seats for reliable operation in harsh high – pressure environments, ensuring effective high – pressure sealing.

Common Nozzle Hole Structures

The structural design of silicon carbide rings directly impacts performance in extreme conditions:

Straight - Wall Type

Structural Feature：Features a uniform cylindrical cross – section with parallel inner and outer walls. The simple, consistent structure ensures stable dimensional tolerance.
Functional Advantage：Delivers reliable static sealing under low – to – medium pressure. Minimizes friction during axial/radial movement, suitable forial movement, suitable for precision guiding components.
Typical Applications：General – purpose seals in standard pumps, valves, and hydraulic cylinders; guiding rings in precision machining tools (e.g., CNC lathe spindles).

Tapered Type (Conical)

Structural Feature：Inner/outer diameters show gradual tapering (e.g., 3°–15° angle). The conical profile creates a self – centering effect under axial load.
Functional Advantage：Concentrates pressure to enhance sealing integrity in high – pressure systems. Improves load distribution, reducing localized wear.
Typical Applications：High – pressure oil/gas wellhead equipment; sealing rings in mining machinery (e.g., rock breaker hydraulic systems); cone crushers’ wear parts.

Grooved Type (Spiral/Annular)

Structural Feature：Integrates spiral/annular grooves on inner/outer surfaces. Grooves may be single or multi – channel, with depths of 0.2–1.5 mm.
Functional Advantage：Grooves act as lubricant reservoirs, reducing friction and heat. Spiral grooves can also guide fluid flow to flush contaminants.
Typical Applications：Sealing rings in high – speed rotating equipment (e.g., turbo – pump seals); wear – resistant rings in marine propeller shafts (with seawater lubrication).

What You Need to Know About Common Ring Parameters

The common parameters of tungsten carbide rings mainly revolve around aspects like material composition, physical properties, and dimensional accuracy. Different application scenarios emphasize distinct parameters. Here’s a breakdown of the core parameters

1. Material Composition Parameters

Silicon Carbide (SiC) Content:
- Pure SiC (≥99.5%) for semiconductor and medical applications.
- Composite SiC with 5–10% additives (Al₂O₃, B₄C) for enhanced thermal conductivity in heat-intensive systems.
Binder Type:
- Reaction-bonded SiC (no binder, high purity).
- Sintered SiC with trace metal oxides for densification.

2. Physical Property Parameters

Hardness: 2500–3000 HV (Rockwell A 92–94), maintaining ≥90% hardness at 1000°C.
Thermal Conductivity: 80–160 W/(m·K), ideal for heat dissipation in electronic cooling systems.
Density: 3.1–3.2 g/cm³, with near-zero porosity for leak-proof sealing.
Melting Point: Decomposes at 2800°C under inert conditions; operational limit up to 1600°C in oxidizing environments.

3. Dimensional and Precision Parameters

Basic Dimensions:
- Inner Diameter: 5–500 mm
- Wall Thickness: 1–20 mm
Geometric Tolerances:
- Roundness: ≤0.001mm for precision seals.
- Surface Roughness: Ra ≤0.1μm on sealing faces (Ra ≤0.02μm for ultra-high vacuum applications).

4. Application-Adapted Parameters

Working Conditions:
- Maximum Pressure: 100 MPa (static), 50 MPa (dynamic).
- Media Compatibility: Resistant to pH 0–14, organic solvents, and molten metals.
Industry Standards:
- Aerospace: Compliant with AS9100 and NASA material specifications.
- Semiconductor: Meets SEMI standards for particle and metal impurity levels.

What Materials Are Commonly Used in Production?

Through the optimization of materials and processes, the service life of silicon carbide rings under extreme working conditions can reach 5 – 10 times that of ordinary materials, making them core wear – resistant components in industries demanding high – pressure sealing like petrochemicals, chemical processing, and semiconductor manufacturing.

Silicon Carbide (SiC)

Hardness and Wear Resistance: Extremely high hardness (2500–3000 HV, ★★★★★), one of the hardest engineering materials, with superior wear resistance for ultra-high temperature and severe wear scenarios (e.g., rocket engine nozzles).
Corrosion Resistance: Exceptional resistance to acids, alkalis, and high-temperature oxidation (★★★★★), stable in extreme chemical environments.
Cost: Extremely high cost and complex processing, limited to specialized high-end fields like aerospace and nuclear energy.
Typical Applications: Aerospace engine fuel nozzles, high-temperature furnace slag discharge nozzles, semiconductor etching equipment nozzles.

What Products Are Commonly Used For?

The core value of tungsten carbide rings lies in delivering exceptional wear resistance and structural stability under harsh industrial conditions. By leveraging their high hardness and adjustable material formulations (e.g., cobalt/nickel binders), they replace vulnerable metals or ceramics in critical sealing, load – bearing, and wear – prone components. This reduces equipment downtime, cuts replacement costs, and maintains precise dimensional accuracy over long – term operation, outperforming conventional materials in extreme scenarios.

Pumps

Application: Centrifugal pumps, reciprocating pumps in oil/gas, chemical, and refining industries.
Role: Seals aggressive fluids (corrosive, particle – laden media) under high pressure/temperature. Prevents leakage, extends pump lifespan in harsh conditions.
Why Choose It: Withstands abrasion from solid particles; resists corrosion by acids/alkalies. Maintains sealing integrity 3–5x longer than metal/ceramic rings.

Compressors

Application: Reciprocating/centrifugal compressors in petrochemical, natural gas sectors.
Role: Seals high – pressure gas streams (e.g., methane, hydrogen). Endures cyclic pressure changes and extreme temperatures.
Why Choose It: High hardness (≥90 HRA) resists deformation; low friction ensures stable operation. Cuts maintenance downtime by 40% in high – cycle systems.

Agitators

Application: Reactor agitators in chemical, pharmaceutical plants (corrosive, high – temp environments).
Role: Seals rotating shafts against reactive fluids (e.g., solvents, catalysts). Prevents hazardous leaks into reactors.
Why Choose It: Maintains precision tolerances (≤0.002mm) under continuous rotation. Outperforms stainless steel in acidic media by 80%+ lifespan.

Valves

Application: Gate valves, globe valves in oil/gas pipelines, chemical processing (high – pressure, abrasive media).
Role: Seals valve seats/discs to block fluid flow. Critical for zero – leakage in emergency shutdown systems.
Why Choose It: Resists galling (metal adhesion) during frequent cycling; handles abrasive slurries (e.g., mining sludge) without failure.

Rotary Joints

Application: Cooling systems (CNC machines), hydraulic circuits (injection molding), paper mills (steam transfer).
Role: Seals rotating interfaces in multi – directional fluid transfer. Adapts to high – speed rotation (≤3000 RPM) and mixed media.
Why Choose It: Self – lubricating under dry – run conditions; maintains seal in misaligned shafts. Reduces leakage rates by 90% vs. rubber seals.

What Is the Replacement Cycle?

The replacement cycle of silicon carbide rings varies significantly depending on operating conditions (pressure, medium, temperature, etc.), equipment type, and material formulation. Below is a reference table for typical scenarios

Application Scenario	Typical Equipment/Component	Replacement Cycle Reference	Factors Impacting the Cycle
Pump Sealing (Petrochemical centrifugal pumps, reciprocating pumps)	Silicon carbide sealing ring	2–5 years	In particle – rich, ultra – high – pressure (> 30MPa) conditions, the cycle shortens to ~ 2 years; In clean, low – pressure scenarios (e.g., pure water transfer), it can be extended to 5 years
Compressor Sealing (Natural gas reciprocating compressors)	Dynamic/static seal assembly	12–24 months	Under high – pressure (> 40MPa), high – speed (> 6000RPM) operating conditions, thermal stress/wear shortens the cycle to 12 months; In mild conditions (pressure < 15MPa, room temperature), it extends to 24 months
Agitator Sealing (Chemical reactor agitator shafts)	Shaft–end sealing ring	3–6 years	In strongly corrosive media (e.g., strong acids/alkalis), wear accelerates and the cycle shortens to 3 years; In neutral media and low – speed agitation (< 400RPM), it can operate stably for 6 years
Valve Sealing (High – pressure gate valves in oil pipelines)	Valve seat/disc sealing ring	12–36 months	Valves with frequent cycling (> 30 cycles/day) or sand – laden media require replacement every 12 months; Valves with stable operation (< 15 cycles/month) and clean media can last up to 36 months
Rotary Joints (CNC machine cooling systems)	High – speed rotary sealing ring	2–4 years	In high – speed (> 4000RPM), multi – medium (oil/water mixture) scenarios, replacement occurs ~ 2 years; In low – speed (< 1500RPM), single – medium (e.g., pure oil) conditions, it extends to 4 years

Special Notes

Extreme Conditions (e.g., highly abrasive mining slurries, aerospace ultra-high temperatures): Cycles may be < 6 months. Real-time monitoring (vibration, leakage detection) is critical for timing replacements.
Material Upgrades: Rings modified with advanced additives or via optimized sintering processes extend service life by 30% – 50% in corrosive/high-temperature environments.
Maintenance Practices: Regular cleaning, lubrication (where applicable), and online monitoring (pressure sensors, infrared thermometry) enable early failure warnings, avoiding unexpected downtime.

For actual operations, adjust replacement timing based on equipment logs and wear inspection reports, prioritizing seal reliability and equipment safety.