Formation of Mn2AlB2 by induction-assisted self-propagating high-temperature synthesis

Merz, Jessica; Richardson, Peter; Cuskelly, Dylan

doi:10.1016/j.oceram.2021.100190

Cited by 6 publications

(5 citation statements)

References 75 publications

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“…5). Unlike Mn 2 AlB 2 [44], the purity of MoAlB does not increase with decreasing the particle size of the raw materials. Figure 6 is the morphologies of the samples from 1Mo/1.3Al/B by SHS for different particle sizes of the raw powders.…”

Section: Effect Of Raw Materials Particle Size On Formation Of Moalbmentioning

confidence: 90%

“…Reference [44] on Mn 2 AlB 2 shows that the decrease in the particle size of the raw materials can reduce the ignition temperature of the SHS, accelerate the reaction speed, and improve the purity of the product to a certain extent. Therefore, this strategy is also used in the present work.…”

Section: Effect Of Raw Materials Particle Size On Formation Of Moalbmentioning

confidence: 99%

“…Moreover, it has been successfully employed for some MAX phases such as Ti 2 AlC [37,38], Ti 3 AlC 2 [39,40], Ti 3 SiC 2 [41], Ti 2 SnC [42], and Nb 2 AlC [43]. Very recently, Merz et al [44] successfully prepared Mn 2 AlB 2 powders by the SHS, indicating their feasibility in the MAB phase materials. However, there has been no report on the synthesis of high-purity MoAlB by the SHS to date.…”

Section: Introduction mentioning

confidence: 99%

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Ultra-fast synthesis and thermodynamic analysis of MoAlB by self-propagating high-temperature combustion synthesis

Yin¹,

He²,

Song³

et al. 2023

Journal of Advanced Ceramics

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MoAlB as a typical member of MAB phases has attracted much-growing attention due to its unique properties. However, the low production of MoAlB powders limits its further development and potential applications. In the present work, the ultra-fast preparation of high-purity MoAlB powders in a few seconds is achieved by self-propagating high-temperature synthesis (SHS) using a raw powder mixture at an atomic ratio of Mo : Al : B = 1 : 1.3 : 1. SHS reaction mechanism is obtained by analyzing the corresponding composition changes of starting materials. Furthermore, the thermodynamic prediction for the SHS reaction is consistent with the present experiments, where the preparation of MoAlB also conforms to two common self-propagating conditions of the SHS. The enthalpy vs. temperature curve shows that the adiabatic temperature of the reaction decreases with the amount of excuse Al increasing but increases when pre-heating the reactants. Also, this thermodynamic calculation provides a new idea for the preparation of other MAB phases by the SHS.

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Section: Effect Of Raw Materials Particle Size On Formation Of Moalbmentioning

confidence: 90%

Section: Effect Of Raw Materials Particle Size On Formation Of Moalbmentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

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Ultra-fast synthesis and thermodynamic analysis of MoAlB by self-propagating high-temperature combustion synthesis

Yin¹,

He²,

Song³

et al. 2023

Journal of Advanced Ceramics

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“…The reaction between the elements often starts at a temperature close to the melting point of aluminum (T Al melt = 660 °C). Both the MAX phases Ti 2 AlC [ 23 ], Ti 3 AlC 2 [ 24 ], and Ti 2 AlN [ 25 ] and the MAB phases MoAlB [ 26 ], Fe 2 AlB 2 [ 27 ], and Mn 2 AlB 2 [ 28 ] have been synthesized under thermal explosion conditions. In refs.…”

Section: Introductionmentioning

confidence: 99%

Phase Formation during the Synthesis of the MAB Phase from Mo-Al-B Mixtures in the Thermal Explosion Mode

Potanin,

Bashkirov,

Kovalev

et al. 2024

Materials

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This work focused on the production of the MoAlB MAB phase through self-propagating, high-temperature synthesis in the thermal explosion mode. The influence of the method of a Mo-Al-B-powder reaction mixture preparation on the combustion temperature, mechanism, and stages of the MAB phase formation in the combustion process was investigated. The combustion temperatures of the mixtures obtained in the rotary ball mill and high-speed planetary ball mill were 1234 and 992 °C, respectively. The formation of intermediate compounds Mo3Al8 and α-MoB in the combustion front, along with MoAlB, was established using the time-resolved X-ray diffraction method. In the case of the mixture prepared in a ball mill, the primary interaction in the combustion front occurred through the Al melt, and in the case of using a planetary mill, solid-phase reactions played an important role. The mechanical activation of the mixture in a planetary mill also accelerated the processes of phase formation. The method of a reaction mixture preparation has virtually no effect on the MoAlB MAB phase content in combustion products (92–94%), but it does affect their structure. The synthesis products have a lamellar structure composed of MAB grains with a thickness of ~0.4 μm and a length of ~2–10 μm.

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“…Обзор литературы не выявил работ по получению MAB-фаз в режиме послойного горения, хотя в условиях теплового взрыва синтезированы MAB-фазы MoAlB [27] и Mn 2 AlB 2 [28]. Таким образом, развитие метода СВС в качестве технологического направления получения MABфаз является перспективной и малоизученной задачей.…”

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Self-propagating high-temperature synthesis of MoAlB boride ceramics based on MAB-phase

Potanin

Bashkirov

Pogozhev

et al. 2022

Izv. VUZ. Poroshk. Met.

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This study focuses on the combustion kinetics and mechanisms of reaction mixtures in the Mo–Al–B ternary system taken so that the MoAlB MAB phase was formed. The effect of the initial temperature on the key combustion parameters was demonstrated. Reaction mixture preheating was found to weakly affect the maximum combustion temperature. The effective activation energy of self-propagating high-temperature synthesis (SHS) was calculated. Phase diagrams in the Mo–Al–B system were built using the AFLOW and Materials Project databases. The phase composition and structure of the synthesized ceramics with MoAlB lamellar grains 0.4 μm thick and ~2–10 μm long as a main component were studied. The DXRD lines of MoB and Mo2B5 intermediate borides with their total content of ≤3 % were also identified. Scanning electron microscopy and energy dispersive spectroscopy studies revealed that the Al2O3 phase was present in the intergranular pores. A sequence of chemical transformations in the combustion wave was studied, and a hypothesis about the structure formation mechanism was put forward. MoO2 and Al2O3 can be the primary phases during SHS, and the MoAlB phase is formed from the boron-containing aluminum–molybdenum melt. Submicron-sized MoB precipitates are formed in the post-combustion zone due to the partial oxidation of aluminum by the dispersion strengthening mechanism.

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Formation of Mn2AlB2 by induction-assisted self-propagating high-temperature synthesis

Cited by 6 publications

References 75 publications

Ultra-fast synthesis and thermodynamic analysis of MoAlB by self-propagating high-temperature combustion synthesis

Ultra-fast synthesis and thermodynamic analysis of MoAlB by self-propagating high-temperature combustion synthesis

Phase Formation during the Synthesis of the MAB Phase from Mo-Al-B Mixtures in the Thermal Explosion Mode

Self-propagating high-temperature synthesis of MoAlB boride ceramics based on MAB-phase

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