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Reaction-sintered silicon carbide, silicon carbide nozzles, radiation tubes, burners, heat-exchange tubes, silicon carbide furnace tubes, burners, silicon carbide plates
The industrial production method for reaction-sintered silicon carbide requires high-quality materials.
Release time:
2022-12-19
Reaction-sintered silicon carbide The industrial production method involves refining high-quality quartz sand and calcined petroleum coke in an electrically heated furnace. The resulting silicon carbide ingots are then crushed, washed with strong acids and strong bases, subjected to magnetic separation, and further processed through screening or hydraulic separation to produce products of various particle sizes.
Silicon carbide comes in two common basic types: black silicon carbide and green silicon carbide, both of which belong to the α-SiC phase. ① Black silicon carbide contains approximately 95% SiC and exhibits higher ductility than green silicon carbide. It is predominantly used for processing materials with low tensile strength, such as glass, ceramics, stone, refractory materials, pig iron, and precious metals. ② Green silicon carbide contains over 97% SiC and boasts excellent self-sharpening properties. It is mainly employed in the manufacturing of cemented carbide tools, titanium alloys, and optical lenses, and is also used for honing cylinder liners and precision polishing high-speed steel tools. In addition, there is cubic silicon carbide—a light-green crystal produced via a novel process. Molds made from this material are ideal for ultra-precision machining of bearings, enabling surface roughness to be reduced in a single pass from Ra32 to Ra0.16 μm down to Ra0.04 to 0.02 μm.
Main applications of reaction-sintered silicon carbide
(1) As a wear-resistant material, it can be used to make molds such as grinding wheels, sharpening stones, abrasive wheels, and sand tiles.
(2) As an oxygen scavenger in the metallurgical industry and as a corrosion-resistant material, silicon carbide has four major applications: functional ceramics, high-end refractory materials, wear-resistant materials, and raw materials for smelting. At present, coarse silicon carbide feedstock is already available in abundant supply and can no longer be considered a cutting-edge product; meanwhile, the application of nano-sized silicon carbide powder—with its exceptionally high technological content—is unlikely to achieve economies of scale in the short term.
(3) High-purity single crystals, suitable for the production of semiconductor materials and the manufacture of silicon carbide chemical fibers.
Scope of Application: Used for wire cutting of photovoltaic cells, solar cells, gallium arsenide, quartz resonators, and other similar components with dimensions ranging from 3 to 12 feet. Applicable to material processing in the solar photovoltaic industry, semiconductor industry, and piezoelectric crystal industry chain engineering projects.
Reaction-sintered silicon carbide - Cause of formation
The ultra-high-pressure, ultra-high-temperature conditions generated in the Earth’s core are brought to the surface along with volcanic lava—for example, in countries such as Thailand, Australia, Shandong Province in China, and the United States. Corundum forms through contact metamorphism—in regions including Myanmar, Kashmir, and Anhui Province in China. Globally, most rubies originate from alluvial deposits. These deposits are formed via the aggregation and sintering of various naturally occurring beryls and blue gemstones through weathering processes. The basic raw materials used for producing silicon carbide include pure natural silica ore, carbon, wood chips, and industrial salt. The material is heated in an electric furnace, where a chemical reaction takes place to produce silicon carbide. Wood chips are added specifically to induce porosity in the small-scale mixture at high temperatures, facilitating the removal of large volumes of gases and volatile substances generated during the reaction and thus preventing explosions. For every ton of silicon carbide produced, approximately 1.4 tons of carbon monoxide (CO) may be released. Industrial salt (NaCl) plays a crucial role by helping to remove residual impurities such as aluminum oxide and other compounds from the feedstock.
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