is solid in black or silvergray. Crystal boron is black and has a hardness second to diamond. Its texture is also brittle.
Elemental Boron is a dark or brownish powder. Diboron trioxide film forms when internal boron has been oxidized in air. Boron powder can react at room temperature with fluorine and is not corroded if it is dissolved in hydrochloric acid or hydrofluoric acids aqueous solutions.
Boron powder is insoluble with water. However, powderedboron can be dissolved in boiling nitric and sulfuric acids, as well as most molten metallics like copper, iron and manganese.
Boron powder used in different fields
Boron powder is used extensively in electronics, medicine, metallurgy and many other fields.
1. Boron powder is used in pyrotechnics. Boron is the best nonmetallic fuel for energy. The small surface area and irregular shape of boron powder make it much more difficult to ignite.
2. Boron powder can also be used as a raw material to make high-purityboron halide or other boron compound materials.
3. Boron powder is used in oxygen-free copper melts as a deoxidizer. During metal smelting, a small amount is added of boron powder. It can be used to deoxidize the metal and prevent it from being oxidized at high temperatures.
4. Boron powder is used to make special metal products and improve the mechanical properties.
5. Boron powder is also a good welding aid.
6. Boron powder is used to make solid rocket propellants.
7. Boron powder is used in the manufacture of automobile airbags.
8. Boron powder is used to make magnesia carbon bricks in high-temperature furnaces for steelmaking.
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