1. Used for casting, sand turning, molding, and high-temperature metallurgical materials: Due to the small coefficient of thermal expansion of graphite and its ability to withstand changes in rapid cooling and heating, it can be used as a mold for glassware. After using graphite, black metal can obtain castings with precise dimensions, smooth surface, and high yield. It can be used without processing or slight processing, thus saving a large amount of metal. Powder metallurgy processes such as producing hard alloys typically use graphite materials to make ceramic boats for pressing and sintering. The crystal growth crucible, regional refining container, support fixture, induction heater, etc. of monocrystalline silicon are all processed from high-purity graphite. In addition, graphite can also be used as a graphite insulation board and base for vacuum smelting, as well as components such as high-temperature resistance furnace tubes, rods, plates, and grids.
2. Graphite can prevent boiler scaling, and graphite coated on metal chimneys, roofs, bridges, and pipelines can prevent corrosion and rust.
3. Graphite can be used as a pencil lead, pigment, and polishing agent.
4. Electrode: Why can graphite replace copper as an electrode.
5. Used as refractory material: Graphite and its products have the properties of high temperature resistance and high strength. They are mainly used in the metallurgical industry to manufacture graphite crucibles. In steelmaking, graphite is commonly used as a protective agent for steel ingots and as a lining for metallurgical furnaces.
6. As a conductive material: used in the electrical industry to manufacture electrodes, brushes, carbon rods, carbon tubes, positive electrodes for mercury rectifiers, graphite gaskets, telephone parts, coatings for television tubes, etc.
7. As a wear-resistant lubricating material: Graphite is often used as a lubricant in the mechanical industry. Lubricating oil often cannot be used under high speed, high temperature, and high pressure conditions, while graphite wear-resistant materials can work without lubricating oil at high sliding speeds at temperatures of 200-2000 ℃. Many devices that transport corrosive media widely use graphite materials to make piston cups, sealing rings, and bearings, which do not require the addition of lubricating oil during operation. Graphite emulsion is also a good lubricant for many metal processing (wire drawing, tube drawing).
8. Graphite has good chemical stability. Specially processed graphite, with characteristics such as corrosion resistance, good thermal conductivity, and low permeability, is widely used in the production of heat exchangers, reaction tanks, condensers, combustion towers, absorption towers, coolers, heaters, filters, and pump equipment. Widely used in industrial sectors such as petrochemicals, hydrometallurgy, acid-base production, synthetic fibers, and papermaking, it can save a large amount of metal materials.