Introduction to BAM Powder AlMgB14
Magnesium aluminum boride
The common name for this is
It is composed of aluminum, magnesium and boron. Its nominal molecular structure is
, and its chemical structure is closer to
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 composite and 0.02 when lubricated.
BAM was first described in 1970. It is an orthogonal structure with four B12 units per cell. The super-hard material’s thermal expansion coefficient is comparable to concrete and steel.
BAM AlMgB14 powder has the following physical properties
Most super-hard materials feature simple, highly symmetrical, crystal structures such as diamond cubes and sphalerite. 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 boron elements. 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 common with borides (see Boride and boron carbide cristal structures for boron rich metals). BAM cell parameters are: a = 1.0313 nanometers, B = 0.8115 nanometers, C = 0.584848 nm; Z = 4, space group Imma and Pearson symbol oI68. Density 2.59 g/cm3. The melting temperature is approximately 2000°C.
BAM has an energy bandgap of 1.5 eV. Resistivity is affected by sample purity and is approximately 104Ohm*cm. The Seebeck coefficient ranges between -5.4 to -8.0mV/K. This property is important for thermoelectric applications because it results in the transfer of electrons between metal atoms and the boron Icosahedron.
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 increased 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. The wear rate of BAM-TiB2 composites was increased by increasing TiB2 content from 70 to 80% to about 10%. The titanium B2 additve is a wear-resistant metal with a hardness between 28 and 35gpa.
AlMgB14’s thermal growth coefficient (TEC) was calculated as 9 x (10-6), (K-1), by expansion measurements, high-temperature Xray diffraction with synchrotron radiation, and expansion measurements. This value is very close to the COTE of steel, titanium and concrete. Based on the AlMgB14 reported hardness value and the material that was used to apply the wear-resistant coat, the COTE for AlMgB14 can help determine the method of coating and the performance of parts after use.
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|
|Appearance||From gray to black powder|
BAM AlMgB14 Pulp Application
BAM is available commercially and is currently being studied for potential applications.
To reduce friction and improve wear resistance, for example, the pistons, seals, or blades of pumps can be coated in BAM, BAM + TiB2 with either BAM, 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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