Overview
Graphite electrode powder is a high-purity carbon material produced by crushing and milling used graphite electrodes or synthetic graphite. It retains the excellent electrical conductivity, thermal stability, and chemical resistance of bulk graphite while offering enhanced processability due to its fine particle size. The powder form enables diverse industrial applications where bulk graphite cannot be used, such as in composite materials or as an additive. Its production typically involves grinding under controlled conditions to achieve specific particle size distributions ranging from micrometers to nanometers.
Physical and Chemical Properties
Graphite electrode powder exhibits anisotropic properties inherited from its crystalline structure, with strong in-plane covalent bonds and weak interplanar van der Waals forces. This gives it exceptional thermal conductivity (up to 1,500 W/m·K in-plane) and low electrical resistivity (5-10 μΩ·m). The material is chemically inert to most acids and alkalis at room temperature but oxidizes above 400°C in air. Its layered structure provides natural lubricity (coefficient of friction 0.1-0.2), while the powder form typically has a bulk density of 0.3-0.7 g/cm³ depending on compaction.
Main Applications
In metallurgy, the powder serves as a recarburizer in steel production and as a component in refractory linings for high-temperature furnaces. The battery industry utilizes it as an anode material in lithium-ion batteries due to its stable intercalation properties. Other significant uses include conductive fillers in polymer composites (10-30% loading), dry lubricants in high-temperature environments, and as a raw material for graphite crucibles. Recent developments explore its use in graphene production through exfoliation methods.
Safety and Storage
As a fine particulate, graphite electrode powder requires careful handling to prevent dust formation. NIOSH recommends a respirable dust limit of 5 mg/m³ (carbon) and suggests using local exhaust ventilation in processing areas. Storage should maintain the powder in sealed containers to prevent moisture absorption (which can affect flow properties) and contamination. While non-flammable as bulk material, airborne dust concentrations above 50 g/m³ may present explosion hazards requiring ATEX-rated equipment in processing facilities.
B2B Procurement Guide
Industrial buyers should specify technical parameters including: fixed carbon content (typically 99-99.9%), ash content (<0.5% for premium grades), particle size distribution (D50 ranging from 5-100 μm), and volatile matter. Pricing tiers reflect these specifications and order volumes. Reliable suppliers provide material safety data sheets (MSDS) and certificates of analysis (CoA). For large-scale procurement, consider suppliers with ISO 9001 certification and ask for production batch consistency data. Spot prices fluctuate with petroleum coke (raw material) market trends and electrode recycling availability.
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