What is Aluminum Boride?
About Aluminum Boride: They are stable to nonoxidizing acids but break down into oxidising solid agents and alkalis. Borides are used in semiconductors, superconductors, diamagnetic, paramagnetic, ferromagnetic, anti-ferromagnetic, turbine blades, and rocket nozzles. It is a layered structure, with Al atoms directly overlapping (A, A mode), and B atoms are filled in the triangular column formed by the direct overlapping of Al atoms; the boron layer is between the two aluminium layers. The boron layer is similar in structure to graphite. The most basic anomaly in these elements is that Boron is a non-metal.
In contrast to this, aluminium is a metal. While Boron is a non-conductor of electricity, aluminium is an excellent conductor of electricity.
The Formation and Growth Behavior of Aluminium Boride Crystals in an Al–B Alloy
The formation of borides in an Al–3 wt.% B alloy produced from the reaction between aluminium and boron oxide has been investigated. Boron dissolved into molten aluminium and cooled to form solid aluminium borides in the aluminium matrix. At room temperature, boride particles were identified as AlB2. Although, the AlB12 phase is the first to form directly from the Al-B liquid above 1000 oC, which transforms to stable AlB2 crystals by a peritectic reaction during cooling. Scanning electron microscope (SEM) and X-ray diffraction (XRD) techniques were employed. Results showed that the shape and distribution of the borides are dependent on the cooling conditions of the liquid Al-B alloy.
Aluminium–Boron (Al-B) alloys are produced commercially
Aluminium–Boron (Al-B) alloys are produced commercially from chemical reactions of potassium tetrafluoroborate (KBF4) with liquid aluminium. Boron is reduced from the fluoride salt by aluminium and disperses into the aluminium melt in the form of aluminium borides. The aluminium boride phases are reported to be in the form of AlB12 and AlB2. At the same time, the latter is stable at room temperature when the boron content is less than 68 at.%. AlB12 transforms peripatetically at around 1000 oC to stable AlB2 (L + AlB12→AlB2). There is a discrepancy about the peritectic temperature, which has been given in different temperatures by different investigators ranging from 950 ◦C to 1350 ◦C. AlB2 has a hexagonal close-packed (HCP) crystal structure with lattice parameters: a = 0.3006 nm and c = 0.3252 nm, whereas AlB12 has a tetragonal crystal structure with a = 1.0161 nm and b = 1.4238 nm. Boron and aluminium occupy alternative layers in the HCP AlB2 crystals. The melting points of AlB2 and AlB12 were reported as 1655±50 ◦C and 2163±50 ◦C, respectively.
Price of Aluminum Boride
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