AlB2 Aluminum Boride Powder

AlB2 Aluminum Boride Powder

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.

Production method:

The structure of aluminum borate is similar to that of intermetallics. Its structure mainly depends on the crystal structure of aluminum and boron rather than their valence relationship. Aluminum borides include AlB2, alb4 and alb12. Diboride AlB2 can be formed by the reaction of two simple substances above 600 ℃. It is a layered structure. Al atoms are directly overlapped (a, a mode), and B atoms are filled in the triangular column formed by the direct overlap of Al atoms, that is, the boron layer is between the two aluminum layers. The structure of boron layer is similar to that of graphite. Boron atoms are connected into a hexagonal network. The distance between each B atom and the other three B atoms is 0.173nm. There are six Al atoms connected with B, which occupy the apex of the triangular column. AlB2 can be dissolved in dilute hydrochloric acid to produce a reducing solution, which may contain HB (OH) +3. AlB2 is insoluble in dilute sulfuric acid, but soluble in nitric acid. AlB2 decomposes to alb12 at above 920 ℃.

Product performance:
The structure of aluminum borate is similar to that of intermetallics. Its structure mainly depends on the crystal structure of aluminum and boron rather than their valence relationship. Aluminum borides include AlB2, alb4 and alb12. Diboride AlB2 can be formed by the reaction of two simple substances above 600 ℃. It is a layered structure, with Al atoms directly overlapping (a, a mode), and B atoms filling in the triangular column formed by the direct overlap of Al atoms, that is, the boron layer is between the two aluminum layers. The structure of boron layer is similar to that of graphite. Boron atoms are connected into a hexagonal network. The distance between each B atom and the other three B atoms is 0.173nm. There are six Al atoms connected with B, which occupy the apex of the triangular column. AlB2 can be dissolved in dilute hydrochloric acid to produce a reducing solution, which may contain HB (OH) +3. AlB2 is insoluble in dilute sulfuric acid, but soluble in nitric acid. AlB2 decomposes to alb12 at above 920 ℃.

Storage conditions

This product should be sealed and stored in a dry and cool environment. It should not be exposed to the air for a long time to prevent moisture and agglomeration, which will affect the dispersion performance and use effect. In addition, it should avoid heavy pressure, do not contact with oxidants, and be transported as ordinary goods.