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Application and Properties of Amorphous Boron Powder

wallpapers Industry 2020-10-15

The content of boron in the earth's crust is 0.001%. Boron is a black or silver gray solid. Crystal boron is black, the hardness is second only to diamond, and the texture is brittle. Boron is named Boron, its name is derived from Arabic, the original meaning is "flux". It shows that the ancient Arabs already knew that borax had the ability to melt metal oxides and was used as a flux in welding.

Elemental boron is black or dark brown powder. When oxidized in the air, the formation of a diboron trioxide film prevents the internal boron from continuing to oxidize. It can react with fluorine at room temperature and is not corroded by hydrochloric acid and hydrofluoric acid aqueous solutions. Boron is insoluble in water. Powdered boron is soluble in boiling nitric acid and sulfuric acid, as well as most molten metals such as copper, iron, manganese, aluminum and calcium.

The chemical properties of amorphous elemental boron are more active than crystalline elemental boron. Crystalline boron is very hard, and it is often used instead of diamond to make cutting tools or drills. A small amount of boron is added in the metal smelting process, on the one hand, it is used as a deoxidizer to prevent the metal from oxidizing at high temperatures; on the other hand, it forms an alloy to improve the performance of the metal.

Amorphous boron powder is an important energy material. It is used as a solid fuel in composite solid propellants. The calorific value of boron is more than twice that of carbon, about twice that of aluminum, and more than twice that of magnesium. Its volumetric heat The value is almost three times that of hydrocarbon fuel, the density is only slightly lower than that of aluminum, and it has the highest volumetric heating value. In terms of its energy, boron should be the best non-metallic fuel. And amorphous boron due to its irregular shape and large specific surface area greatly reduces its ignition temperature.

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