Constante dieléctrica de las cerámicas de nitruro de silicio

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Cerámica de nitruro de silicio, as a high-performance structural ceramic material, play a key role in the fields of electronics, communication, aerospace, and energy due to their unique dielectric properties. This article will provide a comprehensive technical reference for global buyers by analyzing the dielectric constant characteristics, product advantages, application scenarios, and selection criteria of silicon nitride ceramics from a professional perspective.

Basic characteristics of dielectric constant of silicon nitride ceramics

1. Definition and numerical range of dielectric constant
   The dielectric constant (ε) is a physical parameter that measures a material’s ability to store electrical energy in an electric field. The dielectric constant of silicon nitride ceramics is usually in the range of 7.5-8.5 (frequency 1MHz, room temperature conditions), and the specific value is affected by the following factors:
   -Material purity: High purity silicon nitride (Si ∝ N ₄) has a more stable dielectric constant
   -Microstructure: Crystal phase composition (ratio of α – Si ∝ N ₄ to β – Si ∝ N ₄)
   -Preparation process: Differences between hot press sintering and reaction sintering products
   -Test frequency: variation within the range of 1kHz-10GHz is less than ± 0.3
2. Frequency and temperature stability
   The dielectric constant of silicon nitride ceramics exhibits excellent frequency stability (variation<2% from 10Hz-1MHz) and temperature stability (variation<3% from -50 ℃ to 300 ℃), which enables it to maintain consistent performance in a wide frequency band and high and low temperature environments.

Ventajas del producto y capacidad para resolver problemas

1. Key performance advantages
   -Low dielectric loss: tan δ<0.002 (1MHz), ensuring high frequency signal transmission efficiency
   -High thermal conductivity: 90-150 W/(m · K), effectively solving the heat dissipation problem of electronic devices
   -High strength and toughness: flexural strength 600-1000MPa, fracture toughness 6-9MPa · m ¹/²
   -Corrosion resistance: resistant to most acid and alkali corrosion, extending the service life of components
   -Low thermal expansion coefficient: 2.5-3.2 × 10 ⁻⁶/℃, well matched with semiconductor materials
2. Core industry issues to be addressed
   -5G communication: reduce high-frequency signal attenuation, improve the performance of base station filters and antenna covers
   -Power Electronics: Provides integrated insulation and heat dissipation solutions to replace traditional Al ₂ O ∝/AlN substrates
   -Aerospace: Maintaining dielectric stability in extreme temperature/radiation environments
   -New Energy Vehicles: Improving the Reliability of IGBT Modules and Charging Pile Insulation Components
   -Semiconductor manufacturing: as an etching machine component, resistant to plasma corrosion

Application scenario examples

1. Microwave and RF components
   -Radar antenna cover (low dielectric loss ensures signal transmittance>95%)
   -Microwave dielectric resonator (frequency temperature coefficient can be customized to ± 5ppm/℃)
2. Power electronics packaging
   -IGBT/DBC substrate (thermal conductivity>90W/mK, breakdown voltage>15kV/mm)
   -High voltage insulation ring (dielectric strength 40% higher than alumina)
3. Equipos de fabricación de semiconductores
   -Plasma etching ring (corrosion resistance improves equipment life by more than 3 times)
   -Wafer handling arm (anti-static, reducing particle pollution)

Why choose our silicon nitride ceramic products

1. Technological manufacturing advantages
   -Material purity control: High purity silicon powder (>99.9%) and advanced nitriding process are used to ensure batch consistency
   -Precision molding technology: isostatic pressing+pressure sintering, with a density of over 99.5% of the theoretical value
   -Microstructure control: Through additive design and sintering curve optimization, precise control of the aspect ratio of β – Si ∝ N ₄ grains is achieved
   -Processing accuracy: CNC machining+laser cutting, dimensional tolerance can reach ± 0.01mm, surface roughness Ra<0.2 μ m
2. Capacidad de servicio personalizado
   -Customization of dielectric properties: Adjust the ε value (7.0-9.0 adjustable) according to customer frequency requirements
   -Customization of Shape and Size: Supports the production of complex shaped parts and thin-walled parts (with a minimum thickness of 0.3mm)
   -Customization of surface treatment: metalization (Mo Mn method DBC）、 Secondary processing such as coating and polishing
   -Quick sampling cycle: 15-25 days to provide functional samples, reducing customer research and development time

Customer case (anonymous display)
Case 1: European 5G equipment manufacturer
Requisito: Develop millimeter wave antenna cover with ε=8.0 ± 0.2 (28GHz), tan δ<0.003, and a weather resistance of 20 years Solution: Customize material formula with β – Si ∝ N ₄ content>95%, optimize sintering process
Resultado: The product has passed ETSI standard testing and reduced signal loss by 37%. It has been purchased in bulk for 3 years
Case 2: Japanese power module manufacturer
Requisito: Replace AlN substrate to solve the uneven heat dissipation problem of IGBT modules in electric vehicles
Solución: Develop high thermal conductivity silicon nitride (145W/mK) combined with DBC technology
Resultado: Module thermal resistance reduced by 28%, power cycle life increased to 1.8 times that of AlN substrate
Case 3: American Semiconductor Equipment Company
Requisito: Plasma etching machine components, requiring resistance to CF ₄/O ₂ plasma corrosion for>2000 hours
Solution: Adopt high-density reaction sintering Si ∝ N ₄ (>99% theoretical density)
Resultado: Component lifespan has been extended from 600 hours to 2500 hours, and annual maintenance costs have been reduced by 65%

Silicon nitride ceramics have become a key material for high-end electronic and industrial applications due to their unique combination of dielectric properties – moderate dielectric constant, extremely low dielectric loss, excellent thermal management, and mechanical properties. With the rapid development of 5G communication, new energy vehicles, and semiconductor industries, the demand for silicon nitride ceramic components will continue to grow.

Cerámica Brudeze suministra y vende una amplia gama de vidrio de cuarzo de alta calidad, incluyendo cerámica de alúmina, cerámica de circonio, cerámica de nitruro de silicio, cerámica de nitruro de aluminio, cerámica de carburo de silicio, cerámica de carburo de boro, biocerámica, cerámica mecanizable, etc. Podemos satisfacer los requisitos de personalización de varios productos cerámicos.