What is BAM AlMgB14 Powder?

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Introduction to BAM Powder AlMgB14


Magnesium aluminum boride


Oder

Al3Mg3B56

The common name for this is

BAM

It is composed of aluminum, magnesium and boron. Its nominal molecular structure is

AlMgB14

, and its chemical structure is closer to

Al0.75Mg0.75B14

.

It is a ceramic alloy with very high wear resistance, very low sliding friction coefficient and very high wear resistance. This alloy achieved a record 0.04 in the unlubricated AlMGB14–TiB2 compound and 0.02 when lubricated.

BAM was first described in 1970. It is an orthogonal structure which contains four icosahedral B12 unit cells. This super-hard material’s thermal expansion coefficient is comparable to concrete and steel.


Physicochemical properties of BAM AlMgB14 powder



Structure


The crystal structures of most super-hard materials, including diamond cubes and sphalerite, are simple, highly symmetrical. BAM has 64 atoms in each cell, but a more complex and low-symmetry crystal structure. The crystal cell’s most distinctive feature is the four boron-containing, orthogonal icosahedrons. Each icosahedron is composed of 12 boronatoms. The eight remaining boron elements connect the icosahedron with the other elements within the cell. The lattice has less than one metal site, so the material is often identified with the molecular formula AlMgB14. But its chemical composition is closer Al 0.75 mg 0.75 B14. This is quite common in borides. For boron rich metals, please see boride and carbide crystal structures. BAM cell parameters are: a = 1.0313 cm, B =0.8115 cm, C = 0.58488 nm. Z=4 (four structural units per cells), space group Imma. Pearson symbol oI68. Density 2.59 g/cm3. The melting temperature is approximately 2000°C.


Photoelectric


BAM has an energy bandgap of 1.5 eV. The resistance depends on the purity of the sample and is approximately 104Ohm*cm. The Seebeck coefficient ranges between -5.4 to -8.0mV/K. This property is due to electron transfer from metal atoms onto the boron Icosahedron. It is advantageous for thermoelectric purposes.


The hardness and the toughness to break


BAM powders are microhardened to 32-35GPa. You can increase it to 45GPa with nitrization of boron rich titanium alloy. Also, the fracture toughness may be improved by TiB2 or deposition quasi-amorphous BAM materials. It will lose its hardness if you add AlN or TiC. BAM is super-hard by definition if it has a hardness value above 40GPa. BAM-TiB2 Composites are characterized by a 60 vol.% TiB2 content. This is the highest level of hardness and toughness. With a TiB 2 content of 70-80%, the wear rate could be increased by about 10% at the cost of about 10% loss. The titanium B2 additve is a wear-resistant metal with a hardness between 28 and 35 gpa.


Thermal expansion


AlMgB14’s thermal growth coefficient (TEC), also known by thermal expansion coefficient, COTE was calculated as 9 x (10-6) (K-1), using expansion and high-temperature Xray diffraction with synchrotron radiation. This value is very close to the COTE of steel, titanium and concrete. Based on the AlMgB14 reported hardness value and the wear-resistant material itself, the COTE AlMgB14 is useful to determine the coating application and the performance of parts after use.


Friction


BAM and TiB2 are combined in a composite that has a friction coefficient of 0.04-0.05. This value is reduced to 0.02 by water glycol-based oils.

BAM AlMgB14 Powder Properties
Other names Magnesium aluminum boride, Al3Mg3B56, BAM, AlMgB14
Molecular Weight 202.64
Appearance From gray to black powder
Aluminum Magnesium Boride BAM AlMgB14 Powder


BAM AlMgB14 Pulp Application


BAM is available commercially and is currently being studied for potential applications.

To reduce friction between the parts and improve wear resistance, for example, pumps’ pistons, seals, or blades can be coated with BAM, BAM + TiB2 or BAM+ TiB2. Reduced friction means less energy consumption. It is possible to coat cutting tools with BAM. This will decrease the amount of force required to cut an object, prolong tool life, and increase cutting speed. A coating of 2-3 microns thickness has been proven to increase tool efficiency and reduce wear.


BAM AlMgB14 Powder


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BAM AlMgB14 Supplier


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