Oxidation and self-healing behaviour of spark plasma sintered Ta 2 AlC

Farle, Ann-Sophie; Stikkelman, J.; Zwaag, Sybrand van der; Sloof, Willem G.

doi:10.1016/j.jeurceramsoc.2017.01.004

Cited by 18 publications

(19 citation statements)

References 11 publications

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“…This sintering seems to yield a single‐phase Ta 2 AlC, whereas pressureless sintering with the same mixture ratio and the same temperature seems to always yield Ta 2 AlC along with other compounds …”

Section: Resultsmentioning

confidence: 99%

“…The heating rate is 50 °C min −1 to reach 1400 °C while the cooling rate is 100 °C min −1 . After reaching 700 °C, a pressure of 50 MPa is applied …”

Section: Phasesmentioning

confidence: 99%

“…Synthesis using molten Al to form Ta 4 AlC 3 is similar to the technique used to form Ta 3 AlC 2 . Tantalum, Al, and C are mixed according to the ratios of Ta:Al:C = 1:5:0.8 and 1:10:0.8.…”

Section: Phasesmentioning

confidence: 99%

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Synthesis Protocols of the Most Common Layered Carbide and Nitride MAX Phases

2020

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MAX phases represent a large group of carbide‐ and nitride‐layered ternary compounds. Their general formula is Mn+1AXn, where n = 1–3, M is an early transition metal, A is an A‐group element, and X is either carbon or nitrogen. The MAX phases combine properties of metals (good electrical and thermal conductivity, machinability, low hardness, thermal shock resistance, and damage tolerance) with those of ceramics (high elastic moduli, temperature strength, and oxidation and corrosion resistance). Publications on MAX phases have increased considerably in recent years. A late development causing heightened interest in MAX phases is the possibility by which these can be selectively etched to MXenes by removal of the A‐group element. In view of optimizing properties for prospective applications, the synthesis protocols of some of the most common carbide and nitride MAX phases are reviewed. Characterization of their physical, mechanical, and corrosion/oxidation properties is also discussed. Recent developments have revealed the potential for further practical application and have led to accessible strategies to synthesize new MAX phases using the pressure‐less sintering, spark plasma sintering, or molten salt routes.

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Section: Resultsmentioning

confidence: 99%

“…The heating rate is 50 °C min −1 to reach 1400 °C while the cooling rate is 100 °C min −1 . After reaching 700 °C, a pressure of 50 MPa is applied …”

Section: Phasesmentioning

confidence: 99%

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Synthesis Protocols of the Most Common Layered Carbide and Nitride MAX Phases

2020

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“…In such reports, the ceramics had been composited with other phases such as SiC and Ni. The ability of these ceramic‐based composites to recover their mechanical strength through self‐crack‐healing after a high‐temperature treatment has been extensively studied . Theheat‐induced crack‐healing mechanism is attributed to the resintering of cracks by secondary sintering, followed by filling of the cracks by oxidation reaction, the diffusion of the constituent elements and oxide formation .…”

Section: Introductionmentioning

confidence: 99%

Electrochemically assisted room‐temperature crack healing of ceramic‐based composites

et al. 2019

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We demonstrated for the first time the room-temperature crack healing in ceramic-based composites. For this purpose, 20 and 30 vol% of fine titanium metal (Ti) were homogeneously dispersed in electrically insulating alumina (Al 2 O 3 ) ceramic to obtain composites that exhibited excellent electrical conductivity. Electrochemical anodization at room temperature was used to successfully heal cracks induced in the Al 2 O 3 /Ti composites and recover their fracture strength and reliability. The bending strength of as-prepared, crack-induced, and electrochemically healed composites was measured to evaluate the crack-healing ability. Moreover, the effects of the anodization current density, crack size (including length and crack open distance), and the conductivity of the composites on their crack-healing behavior were investigated and discussed. The results indicate that the bending strength of crack-induced composites, which was approximately 61% of the crack-free composite strength, was completely recovered after the crack-healing procedure at room temperature under appropriate anodization conditions. The titanium oxides obtained after anodization formed bridges that healed the crack; this was considered to be the main strength recovery mechanism. By anodizing Al 2 O 3 /Ti composites, we developed a new and convenient approach to heal cracks and recover the fracture strength of cracked ceramics at room temperature.

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“…The authors later performed tests on Ta2AlC, which exhibited no crack healing behavior, to show that the oxidation kinetics also needs to be considered [221]. …”

Section: From Oxidation To Crack Self-healingmentioning

confidence: 99%

Phase Formation of Nanolaminated Transition Metal Carbide Thin Films

Lai¹

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The cover image is a simple sketch of structural-chemical relation in between the metal layers in nanolaminated transition metal carbides: Mo2GaC, Mo2Ga2C, and Mo2(Au1-xGax)2C with an in-plane order in the Au-Ga layers, where the last two phases were discovered in this thesis. © Chung-Chuan Lai 2017Printed in Sweden by LiU-Tryck 2017 ISSN 0345-7524 ISBN 978-91-7685-526-3 i AbstractResearch on inherently nanolaminated transition metal carbides is inspired by their unique properties combining metals and ceramics, such as higher damage tolerance, better machinability and lower brittleness compared to the binary counterparts, yet retaining the metallic conductivity. The interesting properties are related to their laminated structure, composed of transition-metal carbide layers interleaved by non-transition-metal (carbide) layers. These materials in thin-film form are particularly interesting for potential applications such as protective coatings and electrical contacts. The goal of this work is to explore nanolaminated transition metal carbides from the aspects of phase formation and crystal growth during thin-film synthesis. This was realized by studying phases in select material systems synthesized from two major approaches, namely, from direct-deposition and post-deposition treatment.The first approach was used in studies on the Mo-Ga-C and Zr-Al-C systems. In the former system, intriguing properties have been predicted for the 3D phases and their 2D derivatives (so called MXenes), while in the latter system, the phases are interesting for nuclear applications.In this work, the discovery of a new Mo-based nanolaminated ternary carbide, Mo2Ga2C, is evidenced from thin-film and bulk processes. Its structure was determined using theoretical and experimental techniques, showing that Mo2Ga2C has Ga double-layers in simple hexagonal stacking between adjacent Mo2C layers, and therefore is structurally very similar to Mo2GaC, except for the additional Ga layers. For the Zr-Al-C system, the optimization of phase composition and structure of Zr2Al3C4 in a thin-film deposition process was studied by evaluating the effect of deposition parameters. I concluded that the formation of Zr2Al3C4 is favored with a plasma flux overstoichiometric in Al, and with a minimum lattice-mismatch to the substrates. Consequently, epitaxial Zr2Al3C4 thin film of high quality were deposited on 4H-SiC(001) substrates at 800 °C.With the approach of post-deposition treatment, the studies were focused on a new method of thermally-induced selective substitution reaction of Au for the non-transition-metal layers in nanolaminated carbides. Here, the reaction mechanism has been explored in Al-containing (Ti2AlC and Ti3AlC2) and Ga-containing (Mo2GaC and Mo2Ga2C) phases. The Al and Ga in ii these phases were selectively replaced by Au while the carbide layers remained intact, resulting in the formation of new layered phases, Ti2Au2C, Ti3Au2C2, Mo2AuC, and Mo2(Au1-xGax)2C, respectively. The substitution reaction was explained by fast outward diffus...

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Oxidation and self-healing behaviour of spark plasma sintered Ta 2 AlC

Cited by 18 publications

References 11 publications

Synthesis Protocols of the Most Common Layered Carbide and Nitride MAX Phases

Synthesis Protocols of the Most Common Layered Carbide and Nitride MAX Phases

Electrochemically assisted room‐temperature crack healing of ceramic‐based composites

Phase Formation of Nanolaminated Transition Metal Carbide Thin Films

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