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Silicon Nitride Ring
Purity: ≥99%
Diameter: customized
Silicon Nitride Ring is a high-performance ceramic component known for its excellent mechanical strength, wear resistance, and thermal shock stability. It performs reliably in demanding environments involving high temperatures, corrosive conditions, or high-speed rotation, making it a dependable choice for applications such as mechanical seals, bearing systems, and semiconductor processing equipment. We can supply high-quality silicon nitride rings with various specifications and competitive prices, offering customized solutions to meet specific requirements.
Or email us at sales@heegermaterials.com.Silicon Nitride Ring Data Sheet
| Reference Code: | HM2566 |
| Purity: | ≥99% |
| Color: | Black |
| Chemical Formula: | Si3N4 |
| Material Grades: | HMSN1000, HMSN2000, HMSN3000, HMSN4000 |
| Density: | 3.20 g/cm3 |
| Diameter: | customized |
Silicon Nitride Ring Description
Silicon nitride ring offers exceptional durability and chemical resistance, making it ideal for use in environments where both thermal and mechanical stress are present. With its low density and high hardness, it reduces friction and wear in rotating machinery and is commonly used in aerospace, automotive, and precision equipment. Its non-reactive surface and stable insulating properties also suit electronic and chemical applications.
Silicon Nitride Ring Features
- High Strength at Elevated Temperatures: Maintains mechanical integrity under extreme heat without deformation or cracking.
Excellent Wear Resistance: Resists abrasion in demanding friction environments, extending service life.
Low Thermal Expansion: Ensures dimensional stability when exposed to temperature fluctuations.
Lightweight Design: Lower density compared to metals, reducing overall component weight in dynamic systems.
Outstanding Thermal Shock Resistance: Withstands rapid heating and cooling cycles without structural damage.
Silicon Nitride Ring Applications
- Mechanical Seals: Used in pumps and compressors for high-speed, high-temperature sealing with minimal wear.
- Valve Components: Serves as rings, seats, and bushings in chemical and fluid control systems due to its corrosion resistance.
- Kiln Fixtures: Function as a durable support element in high-temperature sintering and firing processes.
- Ceramic Bearings: Form part of hybrid or full ceramic bearings, offering low friction and long service life in harsh environments.
- Aerospace and Defense: Integrated into thermal protection systems and armor plates for its lightweight strength and shock resistance.
Silicon Nitride Material Properties
Silicon Nitride Material Grades
HMSN1000 is produced through a gas over-pressure sintering technique, which is widely recognized for enabling the manufacture of high-strength silicon nitride parts with intricate shapes. The process starts with a silicon nitride powder blend that includes sintering additives—such as yttria, magnesium oxide, or alumina—to create a liquid phase during sintering, as well as binders to enhance the structural integrity of the pre-sintered form. After shaping the powder into the desired geometry and performing any necessary green machining, the components are densified in a nitrogen-pressurized furnace. This environment ensures proper consolidation while minimizing material loss due to evaporation or decomposition of silicon, nitrogen, and the additive elements.
Common Uses
- Components for aerospace systems
- Rolling and sliding elements in bearing units
- High-durability parts for internal combustion engines
- Tools and accessories for casting and metal processing
- Structural parts in mechanical assemblies
- Biocompatible elements for medical devices
HMSN2000 is manufactured using a hot pressing technique, where silicon nitride powder is compacted under high pressure and elevated temperature simultaneously. This method relies on specialized equipment, including precision dies and uniaxial presses. The result is a dense ceramic with outstanding strength and durability. However, the process is best suited for forming basic geometries due to the limitations of the equipment. Since components cannot be machined in the pre-sintered (green) state, all post-processing must be done through diamond grinding, which is both time-consuming and costly. As a result, this method is generally reserved for small-scale production of straightforward parts where premium material performance is required.
Common Uses
- Structural parts in aircraft and spacecraft systems
- Equipment and piping components in chemical processing industries
- Friction-resistant elements for engines
- Tools and wear parts used in metal casting environments
- Load-bearing and precision parts in industrial machinery
- Specialized pieces in medical and dental instruments
HMSN3000 utilizes the Hot Isostatic Pressing (HIP) process, where silicon nitride powder is compacted under both high pressure and high temperature. The material is placed in a chamber that is pressurized with inert gas, subjecting the component to uniform pressure from all sides at up to 2000 bar while it is simultaneously heated. This method helps to remove any residual porosity or defects during the sintering process, resulting in a material with a density close to its theoretical maximum. While HIP significantly improves the mechanical properties, durability, and overall reliability of the material, the high cost and complexity of the process limit its use to highly specialized applications.
Common Uses
- Components for aerospace and defense industries
- Precision bearing applications, especially in high-performance environments
- Equipment and components in chemical processing and industrial plants
- Engine parts subjected to extreme wear and thermal stress
- Foundry tools and wear-resistant components
- High-performance parts for mechanical engineering systems
- Medical components requiring high strength and biocompatibility
HMSN4000 is produced through an extruded gas over-pressure sintering process, where silicon nitride powder is blended with sintering additives, such as yttria, magnesium oxide, and/or alumina, to facilitate liquid-phase sintering. Additionally, binders are incorporated to enhance the mechanical properties of the green ceramic structure. The extrusion process helps form the material into the desired shape, and the parts are then subjected to gas over-pressure sintering in a controlled environment. This method ensures uniform density and superior mechanical performance, making it ideal for high-performance applications.
Common Uses
- Aerospace industry components
- Bearings used in high-performance machinery
- Equipment for chemical plants and industrial processing
- Wear-resistant parts for engines
- Components used in foundry operations
- Parts for mechanical engineering systems
- Medical-grade components for high-precision instruments
Silicon Nitride Ceramic Machining
Silicon nitride can be machined in green, biscuit, or fully sintered forms, each with different machining properties. In green or biscuit states, it is easier to shape into complex forms, but the material shrinks about 20% during sintering, affecting dimensional accuracy. For tight tolerances, fully sintered silicon nitride must be machined using diamond tools, a precise but costly process due to the material’s hardness and toughness.
Machining Methods and Considerations:
- Green or Biscuit Machining: Easier to machine into complex shapes but lacks final dimensional accuracy.
- Sintering Shrinkage: The material shrinks approximately 20% during the sintering process, affecting post-sintering dimensions.
- Tight Tolerances: For precise dimensions, post-sintered material must be machined using diamond tools.
- Diamond Grinding: This technique involves the use of diamond-coated tools or wheels to abrade the material and achieve the desired shape.
- Cost and Time: Machining fully dense silicon nitride is a slow, expensive process due to the hardness and toughness of the material.
Silicon Nitride Ceramic Packaging
Silicon nitride ceramic products are typically packaged in vacuum-sealed bags to prevent moisture or contamination and wrapped with foam to cushion vibrations and impacts during transport, ensuring the quality of products in their original condition.
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