Overview
Flake graphite products are processed from natural graphite ore, characterized by their distinctive lamellar structure. Unlike amorphous or synthetic graphite, flake graphite exhibits superior conductivity and lubricity due to its highly ordered crystalline layers. These products are graded by carbon purity (typically 90–99%), flake size (from fine 50 μm to large 800 μm), and impurity levels, making them versatile for industrial use. Natural flake graphite is mined and then purified through mechanical or chemical methods to meet industry standards. Its unique properties stem from the hexagonal lattice arrangement of carbon atoms, which allows for easy cleavage along the basal plane. This structure underpins its role in high-temperature and friction-reducing applications.
Physical and Chemical Properties
Flake graphite is chemically inert, resisting most acids, alkalis, and organic solvents. Its thermal conductivity (up to 400 W/m·K) and electrical conductivity rival metals, while its layered structure provides exceptional lubricity with a friction coefficient as low as 0.1. The material remains stable up to 3,500°C in inert atmospheres but oxidizes in air above 450°C. Density ranges from 2.09 to 2.23 g/cm³, varying with flake orientation and purity. Graphite’s anisotropy—strong in-plane bonds versus weak interlayer van der Waals forces—enables applications like gaskets (where compressibility is needed) or conductive fillers (where alignment enhances conductivity).
Main Applications
In refractories, flake graphite enhances thermal shock resistance and longevity in steelmaking ladles and crucibles. The battery industry relies on it for anode materials in lithium-ion batteries, where its conductivity and lithium intercalation capacity are critical. Expanded graphite, derived from flake graphite, is used in fire-resistant gaskets and thermal management systems. As a dry lubricant, it reduces friction in high-temperature machinery where oils degrade. Conductive coatings incorporate graphite for EMI shielding or anti-static surfaces. Emerging uses include graphene production and nuclear reactor moderators, leveraging its high neutron absorption cross-section.
Safety and Storage
Graphite dust poses a respiratory hazard; workplaces should enforce dust control (e.g., local exhaust ventilation) and mandate NIOSH-approved N95 masks. Though non-toxic, prolonged inhalation may cause pneumoconiosis. Storage requires dry conditions to prevent oxidation or moisture absorption, which can degrade lubricity. Flake graphite is non-flammable but may react violently with strong oxidizers like perchlorates. Spills should be collected using non-sparking tools to avoid dust dispersion. Waste disposal follows local regulations, though graphite is often recyclable in metallurgical processes.
B2B Procurement Guide
Buyers should prioritize suppliers that provide certified assay reports detailing carbon content, sulfur (<0.5% for battery grades), and ash levels. Flake size dictates suitability—large flakes (300+ μm) command premium prices for high-end refractories, while finer grades (50–150 μm) suit battery anodes. Request samples to verify particle size distribution via laser diffraction analysis. Negotiate bulk pricing for 20+ ton orders, with Incoterms clarifying logistics responsibilities. China dominates production (70% of global supply), but alternative sources in Brazil, Canada, or Madagascar may offer geopolitical diversification. Verify compliance with REACH or RoHS for EU markets.
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