Aluminum Boride Powder, AlB2
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|Traits||black and gray powder|
|Density||3.19 g / cm3|
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Aluminum borate (AlB2) is a kind of binary compound formed by aluminum and boron. It is a gray red solid under normal temperature and pressure. It is stable in cold dilute acid, and decomposed in hot hydrochloric acid and nitric acid. It is one of the two compounds of aluminum and boron. The other is alb12, which is usually called aluminum borate. Alb12 is a black lustrous monoclinic crystal with a specific gravity of 2.55 (18 ℃).
It is insoluble in water, acid and alkali. It decomposes in hot nitric acid and is obtained by melting boron trioxide, sulfur and aluminum together.
In structure, B atoms form graphite flakes with Al atoms between them, which is very similar to the structure of magnesium diboride. The single crystal of AlB2 shows metal conductivity along the axis parallel to the hexagonal plane of the substrate. Boron aluminum composites are reinforced by boron fiber or boron fiber with protective coating.
The volume content of boron fiber is about 45% ~ 55%. Low specific gravity, high mechanical properties. The longitudinal tensile strength and elastic modulus of unidirectional reinforced boron aluminum composite are about 1.2 ~ 1.7gpa and 200 ~ 240gpa, respectively.
The longitudinal specific elastic modulus and specific strength are about 3 ~ 5 times and 3 ~ 4 times of titanium alloy duralumin and alloy steel, respectively. It has been used in turbojet engine fan blades, aerospace vehicles and satellite structures. The hot pressing diffusion bonding method is used to manufacture plates, profiles and parts with complex shapes, and continuous casting method can also be used to manufacture various profiles.