uhp 600 graphite electrode
Datong uhp 600 graphite electrode physical and chemical properties
Uhp 600 graphite electrode is a kind of carbide accidentally discovered in the laboratory by American Acheson during the electrofusion diamond experiment in 1891. At that time, it was mistaken for a mixture of diamonds, so it was named emery. In 1893, Acheson A method of industrial smelting of silicon carbide has been researched out, which is known as the Acheson furnace, which has been used until now. The resistance furnace with carbonaceous material as the core body is energized to heat the mixture of quartz SIO2 and carbon to produce silicon carbide.
Uhp 600 graphite electrode has two common basic varieties of black silicon carbide and green silicon carbide, both of which belong to α-SiC.
①The black uhp 600 graphite electrode contains about 95% SiC, and its toughness is higher than that of green silicon carbide. It is mostly used to process materials with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals.
②Green silicon carbide contains more than 97% SiC and has good self-sharpening properties. It is mostly used for processing cemented carbide, titanium alloy and optical glass, as well as for honing cylinder liners and fine grinding high-speed steel tools. In addition, there is a cubic uhp 600 graphite electrode, which is a yellow-green crystal prepared by a special process. The abrasive tool is suitable for super finishing of bearings. The surface roughness can be processed from Ra32～0.16 microns to Ra0. 04～0.02 microns. Due to its stable chemical properties, high thermal conductivity, low thermal expansion coefficient, and good wear resistance, silicon carbide has many other uses besides being used as abrasives. For example, silicon carbide powder is applied to the impeller or cylinder of a water turbine by a special process. The inner wall can increase its wear resistance and prolong its service life by 1 to 2 times; the high-grade refractory material made of it has heat shock resistance, small size, light weight, high strength, and good energy-saving effect.
The low-grade uhp 600 graphite electrode (containing about 85% SiC) is an excellent deoxidizer. It can speed up the steelmaking speed, and facilitate the control of chemical composition and improve the quality of steel. In addition, silicon carbide is also widely used to make silicon carbide rods for electric heating elements. The hardness of silicon carbide is very high, with a Mohs hardness of 9.5, second only to the world’s hardest diamond (grade 10). It has excellent thermal conductivity, is a semiconductor, and can resist oxidation at high temperatures. There are at least 70 crystalline forms of silicon carbide. α-Silicon carbide is the most common kind of isomorphous crystal, which is formed at a high temperature higher than 2000 °C and has a hexagonal crystal structure (wurtzite-like).
β-uhp 600 graphite electrode has a cubic crystal structure, which is similar to diamond, and is produced below 2000 °C. The structure is shown in the figure on the page. Although in the application of heterogeneous catalyst support, it is eye-catching because of its higher unit surface area than the α type, while another type of silicon carbide, μ-silicon carbide is the most stable and has a more pleasant sound when colliding. But until today, these two types have not yet been commercially applied.
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