Overview
Graphite discs are precision-engineered components cut from synthetic or natural graphite blocks. Their unique combination of properties—including high thermal conductivity, low thermal expansion, and chemical inertness—makes them indispensable in industries requiring extreme temperature management or electrical conductivity. Standard diameters range from 10 mm to 500 mm, with thicknesses tailored to application needs. Industrial-grade discs typically withstand temperatures up to 2500°C in vacuum or reducing atmospheres, while oxidizing environments require protective coatings.
Structure and Working Principle
Graphite discs derive their functionality from the hexagonal lattice structure of carbon atoms, enabling efficient electron mobility and heat transfer. The material's layered structure allows for anisotropic properties, though isotropic graphite discs are preferred for uniform thermal/electrical performance. In EDM applications, the disc serves as an electrode where controlled spark erosion occurs. For furnace components, its thermal shock resistance prevents cracking during rapid temperature changes. The absence of binding agents in high-purity grades minimizes outgassing in vacuum environments.
Key Features
1. **Thermal Management**: Conducts heat 5× better than steel while weighing 70% less, ideal for heat sinks in electronics. 2. **Electrical Properties**: Resistivity as low as 8–12 μΩ·m enables use in current-carrying applications. 3. **Mechanical Stability**: Compressive strength reaches 80–120 MPa, with self-lubricating properties reducing wear. Specialized variants include fine-grained discs (<10 μm grain size) for precision tooling and ultra-high purity grades (<5 ppm metallic impurities) for semiconductor wafer processing.
Application Areas
1. **Energy**: Fuel cell bipolar plates, battery electrodes 2. **Metallurgy**: Continuous casting dies, crucible supports 3. **Electronics**: Silicon wafer carriers, ion implantation components In aerospace, graphite discs function as re-entry vehicle nose tips. The medical sector utilizes them for X-ray tube components due to their radiolucency and heat dissipation.
Maintenance and Precautions
Store in dry environments to prevent moisture absorption, which can cause dimensional changes. For high-temperature oxidizing conditions, apply anti-oxidation coatings like silicon carbide. Clean with alcohol or compressed air—avoid abrasive cleaners that may embed particles. Regularly inspect for surface cracks or pitting in EDM applications, replacing discs when erosion exceeds 20% of original thickness.
B2B Procurement Guide
1. **Certifications**: Request ISO 9001 documentation and material test reports (MTRs) confirming purity. 2. **Customization**: Leading suppliers offer CNC machining to ±0.01 mm tolerances and custom porosity levels. 3. **Logistics**: Graphite is brittle—ensure shock-absorbent packaging and insurance for high-value shipments. Bulk orders (100+ units) typically secure 15–30% discounts. Verify lead times (commonly 4–8 weeks) for specialty grades.
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