Graphite can be a natural or synthetic material that has a high electrical conductivity. It also exhibits exemplary chemical stability. Its ability to absorb and transmit heat is one of its most remarkable properties, making it suitable for use in thermal equipment. The graphite can be easily shaped and molded into complicated shapes.
Although graphite has exceptional properties, it is still not indestructible. Its layers consist of hexagonal, stackable crystals. Unlike most materials that require all four outer energy electrons to bond, the carbon atoms in graphite have two remaining unbound electrons that can act as delocalized electrons. This is what allows graphite a very high level of electrical conductivity, without losing structural integrity.
This is why graphite electrodes are highly desired for EAF. However, it is not indestructible, and after extended exposure to the intense electric discharges that occur during EAF operation, graphite electrodes erode and shorten. In steelmaking this can pose a serious problem, because a ton steel production requires the use of multiple graphite electrodes.
It is possible to extend the service life of EAF by using a ceramic coating. The corrosion of electrodes leads to a loss in energy, which increases steel production costs. To minimize the deterioration of graphite electrodes, a protective coating is needed that can withstand high-energy electric discharges in EAF operation.
The research shows that SiC particles can be intercalated in the graphite carbon structure to prevent erosion. The hybrid of polycrystalline graphite and SiC also has the ability to cycle alkali ions.
The electrophoretic deposition process (EPD), was used to synthesize this graphite-SiC Composite. The X-ray diffraction pattern showed that the composite exhibited broad hump lines, with maxima at a 2nd order value of 23-25deg. These peaks were attributed the SiC nanoscopic layer that has been successfully intercalated onto graphene.
Graphite plays a major role in manufacturing refractory products, and is the subject of more than 6,000 worldwide patent families. Many new inventions are being developed to improve mechanical properties in refractory black graphite, specifically those that are used in EAF or steelmaking. Hufschmied's patented Graftor Tool, for instance, integrates roughing and finish tools into one device. This reduces the processing time up to 50%. The machine magazine can be reduced by replacing many tools with one tool which performs both functions. Graftor's tool geometry also makes programming the machine easier, since fewer dimensions of tools are needed. This can cut programming times by up to half and significantly reduce machine downtime. GRAFTOR® is available on a large range of tools.
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