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Boron carbide

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Boron carbide components

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Boron carbide components

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Silicon Carbide Wear-Resistant Elbow

Silicon Carbide Wear-Resistant Elbow
Boron carbide, also known as black diamond, is an inorganic compound with the chemical formula B₄C, typically appearing as a gray‑black fine powder. It ranks among the three hardest known materials—surpassed only by diamond and cubic boron nitride—and is used in tank armor, bulletproof vests, and numerous industrial applications. Its Mohs hardness is approximately 9.5. First discovered in the 19th century as a byproduct of research on metallic borides, it was not systematically studied until the 1930s. Boron carbide can be synthesized by reducing boron trioxide with carbon in an electric furnace. Boron carbide can absorb large quantities of neutrons without forming any radioactive isotopes, making it an ideal neutron absorber in nuclear power plants, where neutron absorption is crucial for controlling the rate of nuclear fission. In nuclear reactors, it is usually fabricated into controllable rods; however, to increase its surface area, it is sometimes produced in powdered form. Due to its low density, high strength, excellent thermal stability, and superior chemical resistance, boron carbide finds applications in wear‑resistant materials, ceramic reinforcement phases, and especially in lightweight armor and reactor neutron absorbers. Moreover, compared with diamond and cubic boron nitride, boron carbide is easier to manufacture and more cost‑effective, leading to broader use; in some cases, it can replace expensive diamond and is commonly employed in grinding, polishing, and drilling operations.
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