Aluminum boride (AlB2) is a binary compound formed by aluminum and boron. It is a gray black powder under normal temperature and pressure. It loses its surface gloss when heated and is stable in cold dilute acid.
Aluminum Boride Powder Properties
Aluminum diboride is stable in cold dilute acid, and decomposed in hot hydrochloric acid and nitric acid. It is obtained by mixing fine powders of aluminum and boron after heating and reacting.
Aluminum diboride is one of two compounds of aluminum and boron, the other is AlB12, and they are commonly referred to as aluminum boride. AlB12 is a black and shiny monoclinic crystal with a specific gravity of 2.55 (18°C). It is insoluble in water, acid, and alkali, and decomposes in hot nitric acid. It is obtained by melting boron trioxide, sulfur and aluminum together.
In the structure of aluminum diboride, B atoms form a graphite-like sheet with Al atoms between them, which is very similar to the structure of magnesium diboride. The single crystal of AlB2 exhibits metallic conductivity on an axis parallel to the hexagonal plane of the substrate.
Aluminum Boride Powder Preparation
The structure of aluminum boride is similar to that of intermetallic compounds, and its structure mainly depends on the crystal structure of aluminum metal and boron rather than their valence relationship. Aluminum borides are AlB2, AlB4 and AlB12. The diboride AlB2 can be formed by the reaction of two elemental substances above 600°C.
Using amorphous boron powder and aluminum powder as raw materials, powder metallurgy is used to prepare AlB12 powder. X-ray diffractometer and scanning electron microscope were used to determine the phase composition, relative content, and microscopic morphology of the product, and the influence of embedding powder on the phase composition of the product was studied, and the optimal process parameters of the synthesis process were determined.
Aluminum diboride 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.
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