Preparation of aluminium boride by powder technology

Mota, J.M.; Martínez, M. A.; Velasco, F.; Criado, A. J.

doi:10.1016/s0272-8842(03)00103-2

Cited by 13 publications

(6 citation statements)

References 8 publications

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“…Upon the addition of Ti-coated diamond to the Al alloy matrix, the outer α-Ti later enables the wetting of the Al alloy matrix [61]. As a result, the Al3Ti phase was formed around the temperature of 590 °C [62,63], as evident from the XRD peaks at 38.46° and 64.56°, as shown in Figure 5; similar peaks were observed in other research works [58]. Additionally, an improvement in the peak reflection of the Al12Mg17 can be seen in Figure 5, indicating that either the amount of (Al12Mg17) increases or the crystallinity of the (Al12Mg17) phase increases with the increase in the Ti-coated diamond content.…”

Section: Microstructural Analysissupporting

confidence: 82%

“…Finally, the interface-enriched B reacts spontaneously with the Al The bonding can be attributed to the presence of sintering additives, and these additives form low-temperature intermetallic phases. The presence of such phases was revealed by the XRD analysis in Figure 5, the intermetallic Al-rich phases represented by the (111), ( 200), ( 220) and ( 311 [58,59]. The formation of an intermetallic is found to improve the properties [60].…”

Section: Microstructural Analysismentioning

confidence: 97%

“…alloy matrix around 590 °C to form AlB2 [58,59]. The formation of an intermetallic is found to improve the properties [60].…”

Section: Microstructural Analysismentioning

confidence: 99%

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Microstructure and Strengthening Effect of Coated Diamond Particles on the Porous Aluminum Composites

et al. 2023

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In this work, porous Al alloy-based composites with varying Ti-coated diamond contents (0, 4, 6, 12 and 15 wt.%) were prepared, employing the powder metallurgy route and using a fixed amount (25 wt.%) of polymethylmethacrylate (PMMA) as a space holder. The effects of the varying wt.% of diamond particles on the microstructure, porosities, densities and compressive behaviors were systematically evaluated. The microstructure study revealed that the porous composites exhibited a well-defined and uniform porous structure with good interfacial bonding between the Al alloy matrix and diamond particles. The porosities ranged from 18% to 35%, with an increase in the diamond content. The maximum value of plateau stress of 31.51 MPa and an energy absorption capacity of 7.46 MJ/m3 were acquired for a composite with 12 wt.% of Ti-coated diamond content; beyond this wt.%, the properties declined. Thus, the presence of diamond particles, especially in the cell walls of porous composites, strengthened their cell walls and improved their compressive properties.

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Section: Microstructural Analysissupporting

confidence: 82%

Section: Microstructural Analysismentioning

confidence: 97%

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Microstructure and Strengthening Effect of Coated Diamond Particles on the Porous Aluminum Composites

et al. 2023

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“…Для получения лигатуры Al-B наибольшее распространение получил метод алюмотермического восстановления борсодержащих соединений как прямым сплавлением компонентов [2][3][4][5][6][7][8][9][10][11][12], так и с использованием солевых флюсов [13].…”

Section: Introductionunclassified

Production of the Al–B master alloy by KBF4and B 2O3aluminothermic reduction in molten salt flux medium

Катаев

Молчанова

Zaikov

2019

Izv.VUZ. Tsvet. Met.

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The study covers the process of obtaining the Al–B master alloy by the KBF4and B2O3aluminothermic reduction using KF–AlF3and KF–NaF–AlF3fluoride fluxes at 983 and 1123 К, respectively, and KCl–NaCl–KF chloride-fluoride fluxes at Т= 1173÷1223 К. All experiments were carried out under the same conditions: molten mixture stirring rate was 400 rpm, synthesis duration was 30min. The maximum amount of boron (1,5 %) in the Al–B alloy was obtained when using KBF4(3 % per B) as a boron-containing raw material in the KF–AlF3medium with a molar (cryolite) ratio (CR) of KF/AlF3equal to 1,3, atТ= 983 К, while boron recovery ratio did not exceed 75 %. Comparable results were obtained in experiments with KF–NaF–AlF3f lux (CR = 1,5) at Т= 1123 К. However, with the increased concentration of fed boron its recovery ratio decreased substantially. It is connected with the higher decomposition temperature of not only KBF4, but also less thermally stable NaBF4 formed as a result of exchange reaction in the melt. Therefore it is not recommended to use sodium salts as a f lux component. The Al–B master alloys obtained by KBF4reduction in fluoride fluxes were solid solutions of B in Al containing the AlB2intermetallic compound. The lowest amount of boron in aluminum with the minimum degree of extraction was obtained in experiments with the B2O3in molten KF–AlF3with CR = 1,5. Nevertheless, the results of scanning electron microscopy indicate a uniform distribution of B over the Al matrix and the absence of intermetallic compounds, while a large amount of Al2O3was found, which is the product of B2O3reactions with both liquid Al and KF–AlF3flux.

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“…The net absorption coefficient for laser and LWJ machining was determined by matching the temperature at the transformed depth to the onset of the oxidation of aluminum nitride of 900°C [38] and the onset of oxidation of boron nitride of 900°C [39]. The formation of aluminum borides takes place around 1363 K [40].…”

Section: Chemical Analysis Of the Cut Surfacesmentioning

confidence: 99%

Mechanics guided design of hybrid laser/waterjet system for machining of hard and brittle materials

Kalyanasundaram

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Preparation of aluminium boride by powder technology

Cited by 13 publications

References 8 publications

Microstructure and Strengthening Effect of Coated Diamond Particles on the Porous Aluminum Composites

Microstructure and Strengthening Effect of Coated Diamond Particles on the Porous Aluminum Composites

Production of the Al–B master alloy by KBF4and B 2O3aluminothermic reduction in molten salt flux medium

Mechanics guided design of hybrid laser/waterjet system for machining of hard and brittle materials

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