The basic technological process of carbon material production includes: pretreatment of carbonaceous raw materials (pre-crushing, calcination or drying), crushing, grinding and sieving and classification of carbonaceous raw materials, ingredients of carbonaceous raw materials, and bonding after melting and dehydration. In order to increase the density and strength of the product, the calcined body is subjected to high-pressure impregnation and secondary baking cycle densification treatment, the graphitization of the calcined product, and the carbon product And graphite products for mechanical processing.
Why is the quality index of high-power and ultra-high-power graphite electrodes better than ordinary power graphite electrodes?
The current density of graphite electrodes used in high-power and ultra-high-power electric furnaces has increased significantly, resulting in the following problems: (1) The temperature of the electrode increases due to resistance heat and hot air flow, which increases the thermal expansion of the electrode and the joint, and the electrode (2) The temperature difference between the center of the electrode and the outer circle of the electrode increases, and the thermal stress caused by the temperature difference increases accordingly, and the electrode is prone to cracks and surface peeling; (3) The increase in the power of the electric furnace causes electromagnetic force. Increased, causing violent vibration, leading to an increase in the probability of electrode breakage.
Therefore, the physical and chemical properties of high-power and ultra-high-power graphite electrodes must be better than those of ordinary power graphite electrodes, such as lower resistivity, higher density, higher mechanical strength, lower linear expansion coefficient, oxidation resistance and thermal shock resistance Good quality can meet the requirements of high-power and ultra-high-power electric furnaces.
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