In the powder metallurgy process for the production of cemented carbide, graphite materials are generally used to make sintering molds and porcelain ships. Crystal growth crucibles, regional essence containers, support fixtures, induction heaters, etc. It is all made of high-purity graphite. In addition, graphite can also be used as a vacuum melted graphite insulation board and base, high-temperature resistance furnace tube, rod, plate, fence shed and other components. Used in casting, sand casting, molding and high-temperature metallurgical materials: graphite has a small coefficient of thermal expansion and can be used as a casting mold for glassware. After the ferrous metal casting is selected from graphite, the standard is accurate, the appearance is lubricated, and the yield is high. It can be used without processing or with a little processing, which saves a lot of metal. The role of graphite rods in vacuum furnace graphite components.
1. It is used for processing and making graphite crucible ships, discs, single crystal furnaces and other electric heating elements, precious metal molds, and exercise metals; Graphite molds are used in heaters, spark graphite, sintering molds, tube anodes, metal coatings, semiconductor processes; Tubular graphite electrodes, thyristors, mercury arc distillers and graphite products are mainly used in various special graphite, graphite ships, graphite tube heaters, conductive rods, graphite, graphite furnace plate bolts, nuts, graphite brackets and other vacuum resistance furnaces, induction furnaces, sintering furnaces, brazing furnaces, ion nitriding furnaces, tantalum and niobium smelting furnaces, vacuum quenching furnace graphite molds.
2. High-purity graphite rod has the characteristics of high density, good strength, high wear resistance and good wear resistance. It is generally used in high-end graphite products, such as graphite rings, graphite bearings, wear-resistant graphite, graphite melting crucibles, polished surfaces, high-temperature resistant graphite, strong acid and alkali resistance, and can be used to make chemical reactors and other products.
3. It is used for heat insulation and radiation protection materials. After special processing, graphite can be made into a variety of special materials for use in relevant industrial sectors.
4. In high-temperature vacuum furnaces, graphite rods are generally used as electric heaters. The operating temperature can reach 3000°C, and it is easy to oxidize at high temperatures. With the exception of vacuum, they can only be used in neutral or restorative atmospheres. Its thermal expansion coefficient is small, the thermal conductivity is large, the resistivity is (8~13)×10-6ωM, the processing function is better than SiC and MoSi2, high temperature resistance, extreme cold and heat resistance, low price.
5. Electrode: Graphite replaces copper as electrode.
Graphite blocks are used in metallurgical furnaces such as silicon carbide furnaces and graphitization furnaces, resistance furnaces are used as furnace linings and conductive materials, and impermeable graphite heat exchangers. It is widely used in electronics, metallurgy, chemical industry, steel and other fields, with excellent product quality and stable function.