Silicon nitride ceramics with good antioxidant properties

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Silicon nitride ceramics with good oxidation resistance: an ideal material solution for high temperature and harsh environments

Are you facing these material challenges?
Q: Traditional metal or ceramic components are prone to rapid failure in high-temperature, oxidizing, or corrosive environments. What should be done?
Answer: Silicon nitride ceramics with excellent oxidation resistance can work stably for a long time below 1300 ° C, greatly extending the service life of components.
Q: What are the options for materials that combine high strength, lightweight, and heat shock resistance?
Answer: Silicon nitride ceramics have a density of only 40% of steel, but their strength is higher than most engineering ceramics, and their thermal shock resistance is excellent.
Q: How to ensure the reliability of precision components under extreme conditions in fields such as semiconductors and aerospace?
Answer: Silicon nitride ceramics can meet the strict requirements of high precision and high stability through precision machining and customized design.

Product Overview and Antioxidant Mechanism
Silicon nitride (Si ∝ N ₄) ceramic is an advanced structural ceramic, and its excellent oxidation resistance comes from the dense SiO ₂ protective layer formed on the surface. This layer can effectively block further diffusion of oxygen and maintain stable material properties even in high-temperature oxidation environments. Research has shown that the temperature can reach 1200-1350 ° C when used in air, and even up to 1650 ° C for short-term use.

Key performance advantages

1. Excellent antioxidant properties
   In high-temperature oxidation environments, the oxidation rate of silicon nitride is much lower than that of silicon carbide and most metal alloys. After 100 hours of oxidation at 1000 ° C, the weight gain rate is less than 0.1mg/cm ².
2. Excellent mechanical performance
   -Bending strength: 600-1200MPa (room temperature)
   -Fracture toughness: 6-10 MPa · m ¹/²
   -Vickers hardness: 14-17GPa
   -Elastic modulus: 280-320GPa
3. Excellent thermal performance
   -Thermal expansion coefficient: 2.5-3.2 × 10 ⁻⁶/K (20-1000 ° C)
   -Thermal conductivity: 15-30W/(m · K)
   -Thermal shock resistance: Δ T can reach above 800 ° C
4. Good chemical stability
   Resistant to most acid and alkali corrosion (except hydrofluoric acid and hot concentrated alkali), and resistant to molten metal corrosion.

Main application areas

1. Semiconductor manufacturing
   Utilizing the high-temperature stability and cleanliness of wafer carriers, heat treatment fixtures, and plasma etched components.
2. Aerospace
   The turbine rotor blades, bearing components, and high-temperature sensor housing exhibit their high strength to weight ratio and high-temperature resistance characteristics.
3. New energy and chemical industry
   Utilize the corrosion and wear resistance of fuel cell components, chemical pump sealing rings, and high-temperature valves.
4. High end equipment manufacturing
   High speed spindle bearings, precision measuring instrument components, and hot press forming molds leverage their advantages of high precision and long lifespan.

Customized service capability
We provide comprehensive customized solutions:
-Size range: from miniature components (minimum 0.5mm) to large structural components (maximum 500mm)
-Shape complexity: capable of producing complex geometric shapes, including thin-walled, deep hole, and irregular structures
-Surface treatment: Polishing (Ra ≤ 0.02 μ m), coating, metallization and other treatments can be provided according to requirements
-Batch flexibility: supports from prototype trial production to large-scale production (with an annual output of millions of pieces)

Customer Application Cases

1. A semiconductor equipment manufacturer
   Challenge: During the wafer heat treatment process, traditional quartz fixtures are prone to deformation and contamination of the wafer after multiple high-temperature cycles.
   Solution: Adopt our customized high-purity silicon nitride ceramic fixture.
   Result: Extended service life by more than 5 times, reduced wafer contamination rate by 90%, and reduced annual customer maintenance costs by 40%.
2. A certain aerospace research institute
   Challenge: Small turbine engines require lightweight bearings that can operate at temperatures above 800 ° C.
   Solution: Design and manufacture silicon nitride ceramic hybrid bearings.
   Result: Successfully passed 1000 hours of bench testing, reduced weight by 35%, and increased speed by 20%.
3. A certain new energy vehicle enterprise
   Challenge: Fuel cell stacks require bipolar plate materials that are corrosion-resistant and have controllable conductivity.
   Solution: Develop surface modified silicon nitride ceramic bipolar plates.
   Result: The lifespan of the fuel cell stack has been increased to over 15000 hours, and the power density has been increased by 15%.

Anti oxidation silicon nitride ceramics are redefining the material selection criteria for high temperature and harsh environments. Whether it’s improving product performance, extending component life, or solving material problems under special working conditions, we can provide professional technical support and customized solutions.

Brudeze Ceramics supplies and sells a wide range of high-quality quartz glass, including alumina ceramics, zirconia ceramics, silicon nitride ceramics, aluminum nitride ceramics, silicon carbide ceramics, boron carbide ceramics, bioceramics, machinable ceramics, etc. We can meet the customization requirements of various ceramic products.