Spontaneous pulverisation of Al<sub>4</sub>C<sub>3</sub>containing MAX bulk ceramics at room temperature

Li, S. B.; Chen, X. D.; Zhou, Yang

doi:10.1179/1743676114y.0000000142

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…All the alloys that had decrepitated within 1 year contained Al 4 C 3 . This carbide is known to react with water to form solid Al hydroxide and gaseous methane (equation ( 1)), and this promotes the decrepitation of the material [16,17],…”

Section: Introductionmentioning

confidence: 99%

Targeted hydrolysis and decrepitation of Mn₃AlC precipitates: a route to a novel precursor of rare earth free MnAl–C permanent magnets

Jürries

Beyer

Nielsch

et al. 2023

J. Phys. D: Appl. Phys.

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In this work, Mn-Al-C alloys consisting of ε-MnAl and carbides of the types Mn3AlC and Al4C3 were produced and exposed to water at 80°C for 35 days. This led to the hydrolysis and decrepitation of the carbides and ultimately, of the material. The hydrolysis behaviour was studied by combined mass spectrometry, thermogravimetry and differential scanning calorimetry. Microstructural studies with scanning electron microscopy and x-ray diffraction were carried out. X-ray computed tomography was used to study the evolution of cracks on a macroscopic scale. As the Mn3AlC precipitates were present as parallel platelets inside the ε-grains, the hydrolysis resulted in parallel voids separating regions of ε with the same orientation. This ε-skeleton could be easily milled into ε flakes, which could be mechanically aligned so that their <001> directions were parallel. The ε powder was transformed into the ferromagnetic τ phase via heat treatment and is therefore suitable as a novel precursor material for the production of anisotropic τ-MnAl-C-based permanent magnets. Employing such a textured, ε-phase, precursor powder in an extrusion process could result in increased texture quality of the τ-phase with correspondingly enhanced magnetic properties.

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Section: Introductionmentioning

confidence: 99%

Targeted hydrolysis and decrepitation of Mn₃AlC precipitates: a route to a novel precursor of rare earth free MnAl–C permanent magnets

Jürries

Beyer

Nielsch

et al. 2023

J. Phys. D: Appl. Phys.

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“…MAX ceramics are a group of layered ternary ceramics, which have received special attentions over the last decades. [1][2][3][4][5] Among these MAX ceramics, titanium silicon carbide (Ti 3 SiC 2 ) exhibits a surprising combination of the properties of both metals and ceramics, such as relative low density, high strength and toughness, good thermal and electrical conductivities and excellent resistance to thermal shock and oxidation below 1300uC, which make it distinctive compared with conventional ceramics. [6][7][8][9][10] Above all, Ti 3 SiC 2 ceramic also possesses good machinability and can be machined using conventional tools, 11,12 which is of great technological importance.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of graphene nanoplatelets reinforced hot pressed Ti₃SiC₂ceramic

Cheng

Zhi

et al. 2015

Advances in Applied Ceramics

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Ti 3 SiC 2 based ceramic reinforced by 5 wt-% graphene nanoplatelets (GNPs) was prepared by hot pressing at 15508C for 1 h under a uniaxial pressure load of 30 MPa. The effects of GNPs on the strengthening and toughening of the hot pressed Ti 3 SiC 2 based ceramic were investigated. Comparing with t monolithic Ti 3 SiC 2 ceramic, the flexural strength and facture toughness of the Ti 3 SiC 2 -GNP ceramic were significantly improved. The flexural strength and fracture toughness increased from 451.9 to 800.6 MPa, and from 6.23 to 9.67 MPa m 1/2 respectively. The mechanism for these mechanical property improvements was attributed to the layered fracture of Ti 3 SiC 2 grains, refined crystalline strengthening and GNP strengthening.

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“…However, since Al 4 C 3 is hygroscopic and dissolves in water at room temperature [43] it is reasonable to assume that it dissolved during the water-based polishing procedure. Note that EDS analysis of cross-sectional SEM micrographs clearly show that some Al-rich regions were comprised of pure Al; others were found to contain substantial amounts of C with Al/C ratios that varied between 1.0 and 1.9.…”

Section: Equilibrated Samplesmentioning

confidence: 99%

Reactions Between Ti2AlC, B4C, and Al and Phase Equilibria at 1000 °C in the Al-Ti-B-C Quaternary System

Agne

Anasori

Barsoum

2015

J. Phase Equilib. Diffus.

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As automotive, aerospace and the power industries increasingly look to carbide and boride based aluminum, Al, composites for their high specific strengths and increased thermal stability, it is important to characterize the equilibrium phase relations at temperatures common for processing these composites. Herein, two composites were fabricated starting with Al, Ti 2 AlC, and B 4 C. The Ti 2 AlC/B 4 C powders were mixed in both 50/50 and 75/25 vol.% ratios and cold pressed into 53% dense preforms. The preforms were pressureless melt infiltrated in the 900-1050°C temperature range with Al. Ten hour equilibration experiments were also conducted at 1000°C. X-ray diffraction and scanning electron microscopy confirmed that neither Ti 2 AlC nor B 4 C was an equilibrium phase. A number of reaction phases-AlB 2 , Al 3 BC, TiB 2 , TiC, TiAl 3 and Al 4 C 3 -could be found in the non-equilibrated samples. However, the equilibrium phases were found to be Al, TiB 2 , Al 3 BC, and Al 4 C 3 for the more B-rich composite and Al, TiB 2 , TiC, and Al 4 C 3 for the Tirich composite. From these results, the 1000°C quaternary phase diagram adjacent to the AlTiB 2 -Al 4 C 3 triangle and in the Al-rich corner was developed for the first time. This study is a requisite first step for the development and use of advanced composites in the Al-Ti-B-C system.

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Spontaneous pulverisation of Al₄C₃containing MAX bulk ceramics at room temperature

Cited by 6 publications

References 31 publications

Targeted hydrolysis and decrepitation of Mn₃AlC precipitates: a route to a novel precursor of rare earth free MnAl–C permanent magnets

Targeted hydrolysis and decrepitation of Mn₃AlC precipitates: a route to a novel precursor of rare earth free MnAl–C permanent magnets

Characterisation of graphene nanoplatelets reinforced hot pressed Ti₃SiC₂ceramic

Reactions Between Ti2AlC, B4C, and Al and Phase Equilibria at 1000 °C in the Al-Ti-B-C Quaternary System

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Spontaneous pulverisation of Al4C3containing MAX bulk ceramics at room temperature

Cited by 6 publications

References 31 publications

Targeted hydrolysis and decrepitation of Mn3AlC precipitates: a route to a novel precursor of rare earth free MnAl–C permanent magnets

Targeted hydrolysis and decrepitation of Mn3AlC precipitates: a route to a novel precursor of rare earth free MnAl–C permanent magnets

Characterisation of graphene nanoplatelets reinforced hot pressed Ti3SiC2ceramic

Reactions Between Ti2AlC, B4C, and Al and Phase Equilibria at 1000 °C in the Al-Ti-B-C Quaternary System

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Spontaneous pulverisation of Al₄C₃containing MAX bulk ceramics at room temperature

Targeted hydrolysis and decrepitation of Mn₃AlC precipitates: a route to a novel precursor of rare earth free MnAl–C permanent magnets

Targeted hydrolysis and decrepitation of Mn₃AlC precipitates: a route to a novel precursor of rare earth free MnAl–C permanent magnets

Characterisation of graphene nanoplatelets reinforced hot pressed Ti₃SiC₂ceramic