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Silicon Nitride Rod/Bar
Purity: ≥99%
Silicon Nitride Rod/Bar is made from high-purity Si3N4 ceramic using advanced sintering technology, offering excellent strength, wear resistance, and stability in extreme environments. These rods and bars are commonly used in mechanical systems, high-temperature processing equipment, and chemical applications due to their low thermal expansion, high fracture toughness, and strong resistance to thermal shock and corrosion. We can supply high-quality silicon nitride rod/bar with various specifications and competitive prices, offering customized solutions to meet specific requirements.
Or email us at sales@heegermaterials.com.Silicon Nitride Rod/Bar Data Sheet
| Reference Code: | HM2561 |
| Purity: | ≥99% |
| Color: | Black |
| Chemical Formula: | Si3N4 |
| Material Grades: | HMSN1000, HMSN2000, HMSN3000, HMSN4000 |
| Density: | 3.20 g/cm3 |
| Diameter: | Φ5×50mm, Φ15×80mm, Φ30×120mm, Φ50×150mm, or customized |
Silicon Nitride Rod/Bar Description
Silicon Nitride Rod/Bar is a dense, precision-formed ceramic part known for its lightweight nature and outstanding mechanical reliability. It maintains structural integrity under high stress and in chemically aggressive or high-speed environments, making it well-suited for use in pump components, sealing rods, precision bearings, and thermal insulation structures. Its combination of low density, electrical insulation, and long service life makes it a trusted material across various advanced manufacturing fields.
Silicon Nitride Rod/Bar Specifications
| Material | Si3N4 |
| Size | Φ5×50mm Φ15×80mm Φ30×120mm Φ50×150mm Or customized according to specific requirements. |
| Surface roughness | Ra 0.025μm (mirror-like glossy surface) Ra 0.006μm (mirror surface) Or customized |
| Tolerance | The best can be achieved at 0.001mm. |
| Secondary processing | Grinding, Fine grinding, Precision cutting, Drilling, etc. |
Silicon Nitride Rod/Bar Features
- High Mechanical Strength: Offers exceptional flexural and compressive strength, ensuring reliable performance under heavy loads and mechanical stress.
Excellent Thermal Shock Resistance: Withstands rapid temperature changes without cracking, making it suitable for high-temperature cycling applications.
Low Thermal Expansion: Provides dimensional stability due to its low coefficient of thermal expansion, which reduces thermal distortion.
Superior Wear Resistance: Maintains surface integrity over time, even in high-friction or abrasive environments.
Chemical Stability: Resists corrosion from most acids, bases, and molten metals, ensuring durability in chemically aggressive settings.
Silicon Nitride Rod/Bar Applications
- Semiconductor Manufacturing: Used as support or positioning components in wafer processing equipment due to its thermal stability and chemical resistance.
- Metal Processing: Serves as immersion nozzles, thermocouple protection tubes, or stopper rods in non-ferrous metal casting.
- Automotive Industry: Utilized in engine components such as glow plugs and valve guides, especially in high-performance or high-temperature zones.
- Aerospace Components: Applied in structural and insulating parts exposed to extreme mechanical and thermal loads.
- Precision Machinery: Used in shafts, guide rails, and wear-resistant parts in high-precision equipment requiring long-term reliability.
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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