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Silicon Nitride Block
Purity: ≥99%
silicon nitride block is a high-performance ceramic material known for its exceptional mechanical strength, thermal shock resistance, and stability in harsh environments. It performs reliably under high temperatures and corrosive conditions, making it suitable for structural parts, thermal insulation components, and various industrial applications that demand long-term durability. We can supply high-quality silicon nitride blocks with various specifications and competitive prices, offering customized solutions to meet specific requirements.
Or email us at sales@heegermaterials.com.Silicon Nitride Block Data Sheet
| Reference Code: | HM2564 |
| Purity: | ≥99% |
| Color: | Black |
| Chemical Formula: | Si3N4 |
| Material Grades: | HMSN1000, HMSN2000, HMSN3000, HMSN4000 |
| Density: | 3.20 g/cm3 |
| Dimension: | customized |
Silicon Nitride Block Description
Silicon nitride block, also known as an industrial ceramic insulation block, is engineered for use in demanding thermal and electrical environments. Made from high-purity silicon nitride, it offers excellent resistance to thermal shock, mechanical stress, and chemical corrosion. These blocks are commonly used in high-temperature furnaces, semiconductor processing, and energy systems, where reliable insulation and structural integrity are essential. Custom shapes and configurations are available to meet specific design or installation needs.
Silicon Nitride Block Features
- High Thermal Stability: Silicon nitride blocks can withstand extreme temperatures without degrading, making them ideal for high-temperature applications.
- Exceptional Mechanical Strength: With a high bending strength, silicon nitride blocks maintain structural integrity under mechanical stress, providing reliable performance in demanding environments.
- Thermal Shock Resistance: The material’s low thermal expansion coefficient allows it to endure rapid temperature changes without cracking or failure.
- Chemical Resistance: Silicon nitride blocks are resistant to corrosion from a wide range of chemicals, including acids, alkalis, and molten metals, ensuring longevity in harsh environments.
- Electrical Insulation: These blocks provide excellent electrical insulation, making them suitable for use in electronics, electrical equipment, and other applications requiring non-conductive materials.
Silicon Nitride Block Applications
- Electronic Manufacturing: Used as insulation layers or supporting structures in semiconductor fabrication and other high-temperature electronic component processing to protect sensitive parts.
- High-Temperature Furnaces: Employed as internal components, such as supports or thermal barriers, in high-temperature furnaces, enhancing temperature uniformity and minimizing energy loss.
- Chemical Equipment: Utilized in chemical reactors and processing systems as durable, high-temperature-resistant insulating components, capable of withstanding harsh chemicals.
- Aerospace and Advanced Engineering Applications: Applied in environments requiring extreme temperature and mechanical strength, such as in spacecraft thermal protection systems or parts for high-speed machinery.
- Industrial Heating Systems: Serving as insulators or protective barriers in industrial heating systems, silicon nitride blocks help improve energy efficiency and equipment longevity under high-heat conditions.
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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