Green Silicon Carbide 2500# for Automotive Radiator Heat Conduction
Green silicon carbide 2500# (GC2500 mesh) is a widely applied ultrafine high-thermal-conductivity filler for automotive radiators, particularly for thermal management systems in new energy vehicles. Its core performance advantages lie in boosting the thermal conductivity, thermal stability and structural strength of heat dissipation materials.
I. Core Parameters (2500# Grade)
- Particle Size: Median particle size D50 = 5.5±0.5 μm (equivalent to W7 micro powder)
- Purity: SiC ≥ 98.5%; Impurity Content (Fe₂O₃ ≤ 0.40%, Free Carbon ≤ 0.20%)
- Crystal Form: α-SiC hexagonal crystal
- Thermal Conductivity: 80–120 W/(m·K) (4-5 times that of aluminum, hundreds of times that of conventional epoxy resin)
- Coefficient of Thermal Expansion: Approx. 4.0×10⁻⁶/°C (high matching compatibility with aluminum and silicon, low thermal stress)
- Mohs Hardness: 9.4 (excellent wear resistance)
- Density: 3.18–3.20 g/cm³
- High Temperature Resistance: Long-term service at 1600–1900°C, melting point approx. 2250°C
II. Functional Advantages in Automotive Radiators
1. Enhanced Thermal Conductivity
Applied as a functional filler in aluminum-based composites, thermally conductive silicone, sealants and heat dissipation coatings. The fine particles form continuous thermal conduction pathways via mutual contact, lifting the matrix thermal conductivity from 0.2–0.5 W/(m·K) to over 3–10 W/(m·K). It rapidly dissipates excess heat from engines or power batteries, lowers radiator thermal resistance and eliminates localized hot spots effectively.
2. Optimized Thermal Matching & Product Reliability
With a low thermal expansion coefficient, it offsets the thermal expansion and contraction differences between aluminum/copper components and polymer/ chip materials. This reduces interface cracking, delamination and solder joint fatigue caused by repeated temperature cycles, further prolonging the service life of heat dissipation parts.
3. Reinforced Structural & Weather Resistance
The ultra-high hardness improves the strength, impact resistance, wear resistance and deformation resistance of composite materials. Featuring chemical inertness, it delivers outstanding corrosion resistance against automotive coolants, acid, alkaline substances and moisture, stabilizing product performance in complex operating environments.
III. Strengths of 2500# Ultrafine Grade
- Superior Dispersibility: 5.5 μm uniform particles disperse evenly in resin and molten metal without agglomeration, ensuring consistent material performance.
- High Filling Ratio: Supports a high addition ratio of 30–50% while maintaining excellent fluidity of base materials, suitable for diversified processing techniques.
- Smooth & Fine Particle Surface: Ideal for precision heat dissipation parts, thin-walled flow channels and sealing adhesive layers, with no scratching or blocking risks.
- Uniform Heat Dissipation: Ultrafine particles bring a larger heat exchange area, enabling stable temperature rise and balanced overall heat dissipation.
IV. Typical Application Scenarios
Traditional Fuel Vehicles
Radiator water chamber sealants, thermal conductive gaskets, aluminum fin composite coatings
New Energy Vehicles
- Battery packs & motor controllers: thermal conductive gels, thermal conductive pads, potting compounds
- Power modules (IGBT/SiC): substrates, AMB ceramic copper-clad laminates
- Water cooling plates: aluminum-based silicon carbide composites (lightweight structure + high thermal conductivity)
V. Key Procurement & Selection Criteria
- Standard model confirmation: GC2500# / W7, D50=5.5±0.5 μm, SiC purity ≥98.5%
- Narrow particle size distribution with strict D94/D0 control, low magnetic substance and impurity content
- Recommended grade: water-washed or chemically treated micro powder, featuring high purity, clean surface and superior dispersibility
