Products Description
Diamond/Silicon Carbide (SiC), also known as silicon carbide ceramic, carburo de silicio, or Siliziumcarbid, composite substrates are high-performance, advanced materials for electronic packaging and thermal management. They are not a single material but a composite structure typically formed by depositing a high-quality polycrystalline diamond film onto a single-crystal or polycrystalline silicon carbide substrate via methods like Chemical Vapor Deposition (CVD). This design ingeniously combines the advantages of two ultra-wide bandgap semiconductor materials: the excellent semiconductor properties and mechanical strength of silicon carbide (common in sintered silicon carbide or reaction bonded silicon carbide from suppliers like CoorsTek, Morgan Advanced Ceramics, or Saint Gobain Ceramics) with the unparalleled ultra-high thermal conductivity of diamond. Consequently, it is regarded as the ideal integrated "heat dissipation-carrier" solution for next-generation high-power, high-frequency, and high-temperature electronic devices, aiming to solve the "thermal bottleneck" problem caused by the increase in chip power density. For those looking where to buy silicon carbide or sic plates as a base material, numerous silicon carbide manufacturers and suppliers exist globally.
Main Performance Characteristics
- Extreme Thermal Management Performance: Its most prominent feature is its extremely high thermal conductivity. The diamond layer's thermal conductivity can reach 1000-2000 W/(m·K), which is 4-5 times that of copper. This allows for rapid lateral spreading and extraction of heat generated by chips, significantly reducing hotspot temperatures, outperforming traditional materials like silicon carbide heating elements or alumina.
- Excellent Thermal Expansion Matching: The coefficient of thermal expansion (CTE) of silicon carbide is relatively close to that of diamond and third-generation semiconductor materials (e.g., GaN, Ga₂O₃). This matching can significantly reduce thermal stress in devices during high-temperature cycling, improving packaging reliability and lifespan, a key advantage over other technical ceramics.
- High Electrical Insulation: Both diamond and SiC are good insulators. The composite substrate possesses a high breakdown field strength, making it suitable for high-voltage applications, similar to silicon carbide ceramic plates used in mechanical seals or as protection tubes.
- High Mechanical Strength and Hardness: Both materials exhibit hardness and Young's modulus (comparable to B4C ceramic), resulting in a mechanically stable substrate that is wear and corrosion-resistant, suitable for demanding silicon carbide machining into components like bushings, nozzles, or bearings.
- Good Surface Characteristics: The polished substrate surface can achieve atomic-level smoothness, suitable for the direct epitaxial growth of high-quality semiconductor functional layers like GaN, which is critical for epitaxy and CVD coating processes.
Key Technical Parameters
Thermal Conductivity: The overall thermal conductivity of the composite substrate typically ranges between 600-1500 W/(m·K), depending on the quality and thickness of the diamond layer, surpassing that of standard sintered SiC or recrystallized silicon carbide.
Coefficient of Thermal Expansion (CTE): Within the range of 4-5 × 10⁻⁶ /K, which matches well with GaN (~5.6 × 10⁻⁶ /K).
Insulation Performance: Resistivity greater than 10¹⁰ Ω·cm, with a breakdown field strength higher than 10 MV/cm.
Typical Dimensions & Forms: Currently commonly available as wafers (sic sheets), blocks, or can be customized into tubes, rods, or complex parts. Diameters of 2-inch, 3-inch, or 4-inch are standard, with thickness customizable to several hundred micrometers.
Interface Quality: The interfacial thermal resistance between the diamond and silicon carbide is a critical parameter. Advanced fabrication techniques can reduce it to very low levels (<20 m²·K/GW).
Primary Applications
This substrate is primarily used in fields with extremely demanding requirements for heat dissipation and reliability, extending beyond the traditional uses of silicon carbide in refractories, abrasives, or crucibles:
- High-Power Microwave/RF Devices: Used in Gallium Nitride High Electron Mobility Transistors (GaN HEMTs) for 4G/5G/6G communication base stations. The excellent thermal management enhances device output power, efficiency, and linearity.
- High-Power-Density Power Electronic Devices: Suitable for high-voltage converters, inverters in electric vehicles, rail transportation, and smart grids. Can increase the power density and operating junction temperature of devices like IGBTs, SiC MOSFETs, and GaN HEMTs.
- Laser Diodes and LEDs: Used as heat spreaders/submounts for high-brightness laser diode bars and UV LEDs, effectively preventing efficiency droop and wavelength shift caused by temperature rise.
- Aerospace and Defense Electronics: Used in phased array radar T/R modules, electronic warfare systems, and other equipment requiring stable operation in high ambient temperatures.
- Cutting-Edge Technology Fields: Serves as a substrate for sensors and detectors operating under extreme conditions, or for emerging fields like quantum technology. It also finds niche applications in silicon carbide ceramic coating for extreme environments.
quality control
In strict adherence to the ISO 9001 Quality Management System, we implement full-process quality control to ensure the consistent delivery of high-quality products:
• 100% inspection of raw materials, guaranteeing quality from the source
• Utilization of advanced hot-pressing production lines for stable and reliable processes
• A comprehensive in-house testing system covering density, hardness, and microstructure analysis
• Availability of third-party authoritative certifications (including SGS, CE, ROHS, etc., provided upon request)
We remain committed to continuous improvement of our management system, providing customers with consistent and reliable product assurance.
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