Overview
Graphite composite powder is an engineered material combining natural or synthetic graphite with additives like metals, polymers, or ceramics to enhance specific properties. It retains graphite's inherent advantages—such as thermal stability and lubricity—while gaining improved mechanical strength or tailored conductivity from its composite structure. The material is produced through processes like mechanical blending, chemical vapor deposition, or pyrolysis. Its versatility makes it indispensable in industries requiring lightweight, thermally conductive, or friction-reducing solutions, from aerospace to energy storage applications.
Physical and Chemical Properties
The powder exhibits a layered hexagonal crystal structure, enabling low friction coefficients (0.1-0.3) and anisotropic conductivity. Thermal conductivity ranges between 100-400 W/m·K, while electrical resistivity can be adjusted from 10^-5 to 10^3 Ω·cm depending on composition. Chemically, it resists most acids, alkalis, and organic solvents below 400°C. Oxidation resistance is improved in composite forms with anti-oxidant additives. Particle sizes typically range from 1-100 microns, with specific surface areas of 5-30 m²/g for optimized dispersion in binders or coatings.
Main Applications
In metallurgy, it serves as a mold-release agent for continuous casting and as a carburizer in steel production. The electronics industry uses it in thermal interface materials for CPU cooling and as conductive fillers in polymer composites for EMI shielding. Energy applications include anode materials for lithium-ion batteries and fuel cell components. Industrial lubricants incorporate it for high-temperature machinery, where its dry lubricity outperforms oils. Emerging uses include 3D printing filaments and graphene precursor materials.
Safety and Storage
As a fine particulate, inhalation risks require dust control measures like local exhaust ventilation and NIOSH-approved respirators. Static electricity buildup during handling necessitates grounded equipment to prevent ignition in explosive atmospheres. Store in sealed containers away from strong oxidizers (e.g., nitrates, peroxides). Bulk storage silos should maintain relative humidity below 60% to prevent clumping. Firefighting requires Class D extinguishers for graphite-rich compositions; water may exacerbate reactions at high temperatures.
B2B Procurement Guide
Technical specifications should detail: 1) Particle size distribution (D10/D50/D90), 2) Carbon content (typically 80-99.9%), 3) Ash content (<1% for high-purity grades), and 4) Additive types (e.g., copper for enhanced conductivity). Request certified test reports for key parameters like tap density and volatile content. For international shipments, verify whether the material is classified as hazardous under transportation regulations. Consider suppliers with ISO 9001 certification and batch traceability systems. Minimum order quantities often start at 500kg for standard grades.
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