Physicochemical Properties of Boron Carbide
Release date:
2018-03-27 13:59
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Summary:
It does not react with acidic or alkaline solutions and exhibits high chemical stability, neutron absorption, wear resistance, and semiconductor conductivity. It is one of the most acid‑stable materials, remaining stable in both concentrated and dilute aqueous solutions of acids and bases. After treatment with a mixed acid of sulfuric acid and hydrofluoric acid, followed by calcination in air at 800°C for 21 hours, it can be completely decomposed, yielding boron trioxide and diboron trioxide. When certain transition metals and their carbides are present together, it displays exceptional stability. At temperatures between 1000 and 1100°C, transition metals from Groups IV, V, and VI of the periodic table react vigorously with boron carbide powder to form metal borides. In the presence of nitric acid…
It does not react with acidic or alkaline solutions and exhibits high chemical stability, neutron absorption, wear resistance, and semiconductor conductivity. It is one of the substances that are stable in acids; it remains stable in both concentrated and dilute aqueous acid or alkali solutions. After treatment with a mixed acid of sulfuric acid and hydrofluoric acid, followed by calcination in air at 800°C for 21 hours, it can be completely decomposed to yield carbon trioxide and boron trioxide.
When certain transition metals and their carbides coexist, they exhibit exceptional stability.
At temperatures between 1000 and 1100°C, transition metals from Groups IV, V, and VI of the periodic table react vigorously with boron carbide powder to form metal borides.
In the presence of nitric acid, boron carbide readily decomposes and forms a solution when fused with sodium hydroxide, potassium hydroxide, sodium carbonate, or potassium carbonate.
Its Mohs hardness is 9.3, making it the fifth known hard material, following boron nitride, diamond, fullerene compounds, and carbon nanotubes.
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