The stages of graphite furnace processing involve several critical steps, each designed to transform raw materials into high-quality graphite suitable for various industrial applications. The process includes carbonizing, pitch impregnation, pulverizing, isostatic pressing, and final graphitization.
Carbonizing is a lengthy process, typically lasting 2-3 months, where the evenly pressed material is placed in large furnaces and heated to temperatures reaching 1000°C. This stage is crucial for achieving the desired hardness in the graphite block. The temperature is closely monitored to prevent defects or cracks.
Pitch Impregnation follows the carbonizing stage. Here, the block is impregnated with pitch, which is then burned again to reduce porosity. This step uses pitch with a lower viscosity to ensure precise filling of gaps, enhancing the structural integrity of the graphite.
2nd Pulverizing occurs after the mixing process, where small carbon balls are milled into very fine grains. This step is essential for preparing the material for the next stage.
Isostatic Pressing involves placing the fine grains into large molds corresponding to the final block sizes. The powder is subjected to high pressure (over 150 MPa), ensuring equal force and pressure distribution across the grains. This symmetry in arrangement and distribution is crucial for achieving uniform graphite parameters throughout the mold.
Final Graphitization is the ultimate stage, where the material undergoes purification in a furnace at 1100°C maximum, followed by transfer into a graphite furnace for graphitization at up to 3000°C. This high-temperature treatment aligns the graphite layers and removes impurities, resulting in nearly ideal graphite properties that are homogeneous and reproducible.
Each of these stages is critical in the production of high-quality graphite, ensuring that the final product meets the stringent requirements for various industrial applications. The use of advanced furnace technologies, such as those provided by KINTEK, ensures efficient and effective processing, from carbonization to the final graphitization stage.
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