2022-11-23
2023-03-271. Refractory material: including refractory bricks, calamity, continuous cast powder, molding core, casting detergent and high temperature resistance. In the past 20 years, the two important changes in the refractory material industry have been widely used in magnesium carbon bricks in the inside of the steelmaking furnace, and the application of aluminum carbon bricks in continuous casting.
2023-03-221. When the graphite mold is repaired and quenched, heating and quenching without annealing in the middle; 2. Excessive heating temperature for quenching is overheated or burned; 3. There are mechanical processing or cold plastic deformation stress in graphite mold; 4. There are severe mesh carbides in the material; 5. After quenching, the fire is not timely or the insulation time is insufficient; 6. Improper heat treatment operation of graphite mold. If heated or cooling is too fast, improper selection of quenching and cooling medium, low cooling temperature, too long cooling time, etc.; 7. When the graphite mold heats is processed by electric sparks, there are high stress stress and micro -cracks in the hardening layer; 8. The graphite mold is heat -treated and the grinding process is improper. 9. The shape of graphite mold is complex, unevenly thick, with sharp corners and thread holes, which make the heat stress and tissue stress too
2023-03-22I. Special seismic resistance: Graphite's expansion gear is different, so the macro expansion coefficient is not large. In the case of sudden changes in temperature, graphite volume has not changed much; coupled with its good thermal conductivity, graphite resistance is excellent.Second, lubrication: The graphite layer is Van Der Waal Forces, which combines weak combination to make it lubricating. The lubrication of graphite depends on the size of the graphite scales. The larger the scales, the smaller the friction coefficient, the better the lubricity.Third, good chemical stability and resistance to erosion: Graphite has good chemical stability at room temperature, not subject to any strong acid, strong alkali and organic solvents; the carbon atom in the graphite layer is firm Combining, the surface of graphite phosphorus can be very low, not moisturizing by melting furnaces, and strong resistance to erosion. However, graphite is prone to oxidation in the air, and anti -oxidation mea
2023-03-221. Broken: Graphite mold directly contacts the matrix powder containing diamond. The contact surface is in a high pressure state. The hardness of diamond and graphite mold is too poor. The surface of the mold that is in contact with diamond tool head will produce concave pits.Second, the type of damage: During the sintering process, the matrix powder infiltrates into the oxidation gap of the graphite mold under the melting state, resulting in the adhesion between the tool head and the mold, making it difficult for molding. The repeated attack of the mold can remove the mold, which causes the lack of edges and metal pit in the mold.Third, the wear size of graphite molds is very poor: some substrate powder will be squeezed out of the mold surface in the melting state to attach to the graphite material. Before using the mold next time, metal residues must be removed manually, which causes the shape and size of the mold to exceed the tolerance.Fourth, surface oxidation and cracking: Becau
2023-03-22Systematic graphite mold maintenance is based on the coherence of maintenance needs and maintenance operations. In order to achieve the "cost -effectiveness" goal, cleaning graphite molds must be paid attention to. Formulate a detailed graphite mold cleaning plan. When cleaning the different parts of the graphite mold, such as cleaning inside the press, wiping along the edge, routine cleaning, and the main part of the cleaning, the cleaning operation method is also different. After the graphite mold runs a certain period of time and is tested by electroplating, magnetic labeling, and graphite molds in the ventilation holes and non -open air holes, the technical staff can determine the procedure and frequency of the graphite mold cleaning through the appearance inspection. Essence Therefore, it is very important to understand the cycle of the safe operation of graphite mold and the observation report of the accumulation and wear of residual objects inside the graphite mold. Based on gr
2023-03-221. Use as conductive materialsWhen using an arc furnace or mineral heat electric furnace to smell all kinds of alloy steel, iron alloys or production stones (carbonized calcium), and yellow phosphorus, strong current passes through carbonic electrodes (or continuous self -roasting electrodes -that is, electrode paste) or graphite electrode introduction The melting area of the electric furnace generates an arc, which translates the electrical energy into thermal energy, and the temperature increases to about 2000 degrees Celsius, so as to meet the requirements of smelting or reaction. Metal magnesium, aluminum, and sodium are generally removed with melting salt electrolysis. At this time, the anode conductive material of the electrolytes use graphized electrodes or continuous self -baking electrodes (anode paste, sometimes pre -baking anode). The temperature of melting salt electrolytic is generally below 1,000 degrees Celsius. The anode conductive material for producing alkaline (sodi
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