What is Aluminium magnesium boride?
AlMgB14 ceramics were reported as high-hardness materials over a decade ago. While different synthesis routes for processing AlMgB14 ceramics were reported in the past, the synthesis routes are still not optimized and present a significant challenge to the manufacturers. This work explored six different synthesis routes for the synthesis of AlMgB14 powder. The synthesized compositions were characterized by XRD, where weight fractions of each phase were calculated by Rietveld refinement. Hardness and indentation fracture resistance of AlMgB14 ceramics were measured to be 26.7 ± 2.2 GPa and 5.59 ± 0.42 MPa m1/2, respectively, by the Vickers indentation technique. Under an oxygen atmosphere, thermogravimetry–differential scanning calorimetry showed that the heat release of the prepared material was much higher than that of untreated boron. Arkhipov et al. investigated the ignition and combustion of mixed powder composed of aluminum, boron, and boron–aluminum alloy powder with an adhesive and oxidizing agent (ammonium perchlorate/ammonium nitrate). The results showed an increased combustion rate of the mixed powder containing the boron–aluminum alloy powder. Wainwright et al. prepared Al: Zr, Al-8Mg: Zr, and Al-38Mg: Zr nanocomposite particles by physical vapor deposition (PVD) and ball-milling. The SEM results showed significant particle sintering for both PVD and ball-milled particles and all three compositions.
Aluminium magnesium boride: synthesis, sintering and microstructure
AlMgB14 ceramics were reported as high-hardness materials over a decade ago. While different synthesis routes for processing AlMgB14 ceramics were reported in the past, the synthesis routes are still not optimized and present a significant challenge to the manufacturers. This work explored six different synthesis routes for the synthesis of AlMgB14 powder. The synthesized compositions were characterized by XRD, where weight fractions of each phase were calculated by Rietveld refinement. The bulk ceramics were sintered using powder with the highest yield (93.2%) of AlMgB14 phase by spark plasma sintering at 1315°C and 50 MPa. Both phase composition and microstructure of the sintered AlMgB14 were characterized by XRD and SEM/EDS, which revealed the existence of AlMgB14, MgAl2O4, and a small amount of unreacted Al. Hardness and indentation fracture resistance of AlMgB14 ceramics were measured to be 26.7 ± 2.2 GPa and 5.59 ± 0.42 MPa m1/2, respectively, by the Vickers indentation technique. Under an oxygen atmosphere, thermogravimetry–differential scanning calorimetry showed that the heat release of the prepared material was much higher than that of untreated boron. Arkhipov et al. investigated the ignition and combustion of mixed powder composed of aluminum, boron, and boron–aluminum alloy powder with an adhesive and oxidizing agent (ammonium perchlorate/ammonium nitrate). The results showed an increased combustion rate of the mixed powder containing the boron–aluminum alloy powder. Wainwright et al. prepared Al: Zr, Al-8Mg: Zr, and Al-38Mg: Zr nanocomposite particles by physical vapor deposition (PVD) and ball-milling. The SEM results showed significant particle sintering for both PVD and ball-milled particles and all three compositions.
Preparation and Characterization of Mg–Al–B Alloy (Mg0.5Al0.5B2) Via High-Temperature Sintering
Boron and its alloys have long been explored as potential fuel and increasingly replace pure aluminum powder in high-energy formulations. The ignition and burning properties of boron can be improved by making boron alloys. This study synthesized an Mg–Al–B alloy from magnesium, aluminum, and boron powders in a 1:1:4 molar ratio by preheating to 600 °C for 30 min, followed by high-temperature sintering in a tube furnace. The effects of sintering temperature (700–1000 °C) and holding time (0.5–10 h) on the phase composition of mixed powders were studied. After the samples were cooled to room temperature, they were ground into powder. The phase composition, micromorphology, and bonding forms of elements of the synthesized samples were studied using XRD, SEM, and XPS. The results show that each element is a simple substance in the alloy. The influence of the sintering temperature on the synthesis reaction of Mg0.5Al0.5B2 is very important, but holding time has little effect on it. With the increase of sintering temperature, the content of the Mg0.5Al0.5B2 phase gradually increases, and the phase content of residual metal gradually decreases. The phase and morphology analyses show that the optimum sintering temperature is 1000 °C with a minimum holding time of 0.5 h. It is expected to be used with improved characteristics in gunpowder, fuel, explosives, and pyrotechnics. As a special energy material, combustible metal powder is widely used in gunpowder, fuel, explosives, and pyrotechnics. Among the explosive metal powders, aluminum powder has high combustion heat, fast burning speed, and low oxygen consumption. It is currently the most commonly used metal combustion agent in propellants, explosives, and pyrotechnics. However, aluminum powder is easy to agglomerate, and a dense aluminum oxide film is formed on the surface during the actual combustion process, preventing the complete combustion of aluminum. Magnesium is easy to ignite and burn, but the calorific value is low.
In contrast, the theoretical calorific value of boron is very high (58.86 KJ/g), 2.3 times that of magnesium and 1.9 times that of aluminum. The volumetric calorific value of boron (137.73 KJ/cm3) is 3.09 times that of magnesium and 1.66 times that of aluminum. However, the boron particles have a higher ignition temperature, and the highly viscous liquid boron oxide easily surrounds the boron particles during combustion. Therefore, the reaction between the boron and the oxidant is hindered. Besides, the boron particles agglomerate easily, making the combustion of boron particles difficult to continue, resulting in low combustion efficiency and insufficient performance despite boron’s high-energy characteristics.
Price of Aluminium magnesium boride
Aluminium magnesium boride particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Aluminium magnesium boride. A large amount of large amount will be lower. The Price of Aluminium magnesium boride is on our company's official website.
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