Synthesis, microstructure and properties of MoAlB ceramics

Xu, Ludi; Shi, Ouling; Liu, Caiyun; Zhu, Donghui; Grasso, Salvatore; Hu, Chunfeng

doi:10.1016/j.ceramint.2018.04.177

Cited by 86 publications

(67 citation statements)

References 34 publications

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“…Among them, MoAlB has attracted particular attention because of its many excellent properties and great application potential (e.g., electrocatalysis, composite reinforcement, solid lubrication and high temperature coating). It has a good electrical/thermal conductivity, small thermal expansion, great compressive strength and high fractural toughness [2][3][4][5][6][7]. It also has been confirmed to be stable at up to 1400 • C in an inert atmosphere [3].…”

Section: Introductionmentioning

confidence: 98%

“…They are mainly used to prepare bulk MoAlB from MoB and Al powders. To our knowledge, the only method that has been attempted to date to synthesise MoAlB powder is the conventional mixed powder technique [6,14], i.e., directly heating a mixture of MoB and Al at a high temperature (>1100 • C). Unfortunately, with this technique, it is difficult to prepare high quality (phase pure, good dispersion and fine size) MoAlB powders, because some intermediate/impurity phases (e.g., MoB 2 ) almost always remain in the final product powder.…”

Section: Introductionmentioning

confidence: 99%

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Low Temperature Synthesis of Phase Pure MoAlB Powder in Molten NaCl

et al. 2020

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MoAlB fine powders were prepared in molten NaCl from Al, B and Mo powders. The effects of key parameters affecting the synthesis process and phase morphology were examined and the underpinning mechanisms proposed. MoAlB product particles exhibited different shapes/sizes, as follows: spherical grains (1~3 µm), plate-like particles (<5 µm in diameter) and columnar crystals with lengths up to 20 µm and diameters up to 5 µm, resultant from different reaction processes. Phase pure MoAlB was synthesised under the following optimal conditions: use of 140% excess Al and 6 h of firing at 1000 • C. This temperature was at least 100 • C lower than required by other methods/techniques previously reported. At the synthesis condition, Mo first reacted with Al and B, forming Al 8 Mo 3 and MoB, respectively, which further reacted with excess Al to form Al-rich Al-Mo phases and MoAlB. The Al-rich Al-Mo phases further reacted with the residual B, forming additional MoAlB. The molten NaCl played an important role in accelerating the overall synthesis process.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Low Temperature Synthesis of Phase Pure MoAlB Powder in Molten NaCl

et al. 2020

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“…Xu et al studied the oxidation behavior of bulk MoAlB synthesized in a three-step process of MoAlB powder synthesis at 1100 • C, etching of surplus Al, followed by hot pressing at 1600 • C to increase the density. It was shown that a dense, protective, and adherend alumina scale is formed on bulk MoAlB after cyclic oxidation at 1600 • C for a total of 50 h [3]. Shi et al oxidized needle-shaped and plate-like MoAlB single crystals and inferred from the difference in average weight loss that the oxidation behavior is anisotropic [4].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Orthorhombic MoAlB Coatings

et al. 2019

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MoAlB is a potential candidate for high-temperature application since a dense, adherent alumina scale is formed. While, based on X-ray diffraction investigations, the formation of phase pure orthorhombic MoAlB coatings is observed, energy dispersive X-ray spectroscopy carried out in a scanning transmission electron microscope reveals the presence of Al-rich and O-rich regions within the MoAlB matrix. The oxidation kinetics of coatings and bulk is similar to the scale thickness formed on the MoAlB coating after oxidation at 1200 °C for 30 min is similar to the one extrapolated for bulk MoAlB. Furthermore, the oxidation kinetics of MoAlB coatings is significantly lower than the one reported for bulk Ti2AlC. Finally, the elastic properties measured for the as-deposited coatings are consistent ab initio predictions.

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“…“MAB” phases or Boron containing ternaries have also emerged as promising additives . Kota et al synthesized and characterized bulk polycrystalline MoAlB ceramics by using a single step reactive hot‐pressing technique.…”

Section: Introductionmentioning

confidence: 99%

“…11,12 "MAB" phases or Boron containing ternaries have also emerged as promising additives. 16,17 Kota et al 17 synthesized and characterized bulk polycrystalline MoAlB ceramics by using a single step reactive hot-pressing technique. They observed that MoAlB forms dense and adherent alumina scales during static oxidation up to at least 1300°C.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel polymer matrix composites reinforced with max phases (Ti₃SiC₂, Ti₃AlC₂, and Cr₂AlC) or MoAlB by fused deposition modeling

Hall

Dey

Matzke

et al. 2019

Int J Ceramic Engine & Sci

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In this paper, we report the synthesis and characterization of polylactic acid (PLA)‐MAX (Ti3SiC2, Ti3AlC2, and Cr2AlC) and PLA‐MoAlB composites by fused deposition modeling (FDM). Detailed scanning electron microscopy (SEM) studies showed that the particulate phases are uniformly dispersed in the PLA matrix of 3D‐printed samples. Differential scanning calorimetry (DSC) results showed that the addition of MAX phases promoted crystallization of PLA matrix as compared to MoAlB particulates. The mechanical testing results showed that the PLA matrix is sensitive to the addition of MAX or MoAlB phases, for example, PLA‐5 wt% Ti3SiC2, PLA‐5 wt% Ti3AlC2, and PLA‐5 wt% Cr2AlC had a UTS of ~39 MPa, ~30.5 MPa, and ~38.7 MPa as compared to ~41.5 MPa in pure PLA. Comparatively, PLA‐5 wt% MoAlB had a UTS of ~23.2 MPa which shows that predominantly amorphous PLA‐MoAlB composites have lower strength. The tribological behavior improved after the addition of 1 wt% additives, for example, in PLA‐Cr2AlC, the friction coefficient decreased by 76% to ~0.26 from ~0.34 in pure PLA, and the WR marginally decreased in PLA‐1 wt% Cr2AlC to ~2.2 × 10−5 mm3/Nm as compared to 7.7 × 10−5 mm3/Nm in PLA. SEM investigations of the tribosurfaces showed the tribology is governed by the formation of tribofilms. The wettability study showed that all the 3D‐printed samples are hydrophilic in nature.

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Synthesis, microstructure and properties of MoAlB ceramics

Cited by 86 publications

References 34 publications

Low Temperature Synthesis of Phase Pure MoAlB Powder in Molten NaCl

Low Temperature Synthesis of Phase Pure MoAlB Powder in Molten NaCl

Synthesis and Properties of Orthorhombic MoAlB Coatings

Synthesis and characterization of novel polymer matrix composites reinforced with max phases (Ti₃SiC₂, Ti₃AlC₂, and Cr₂AlC) or MoAlB by fused deposition modeling

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Synthesis, microstructure and properties of MoAlB ceramics

Cited by 86 publications

References 34 publications

Low Temperature Synthesis of Phase Pure MoAlB Powder in Molten NaCl

Low Temperature Synthesis of Phase Pure MoAlB Powder in Molten NaCl

Synthesis and Properties of Orthorhombic MoAlB Coatings

Synthesis and characterization of novel polymer matrix composites reinforced with max phases (Ti3SiC2, Ti3AlC2, and Cr2AlC) or MoAlB by fused deposition modeling

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Synthesis and characterization of novel polymer matrix composites reinforced with max phases (Ti₃SiC₂, Ti₃AlC₂, and Cr₂AlC) or MoAlB by fused deposition modeling