Long-Time Oxidation of Cr2AlC Between 700 and 1,000 °C in Air

Lee, Dong Bok; Nguyen, Thuan Dinh; Park, Sang Whan

doi:10.1007/s11085-012-9285-7

Cited by 47 publications

(49 citation statements)

References 14 publications

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“…Like a metal the Cr 2 AlC-MAX phase, which was studied in this work, is easy to machine at room temperature, thermal-shock resistant [1][2][3][4][5], thermally and electrically conductive, and damage tolerant [6].…”

Section: Structure and Properties Of Cr 2 Alc-max Phasementioning

confidence: 99%

“…1. The synthesis, microstructure, mechanical and electrical properties, high temperature oxidation, hot corrosion resistance and tribological behavior of Cr 2 AlC have been studied so far mainly for bulk material [1][2][3][4][5][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Structure and Properties Of Cr 2 Alc-max Phasementioning

confidence: 99%

“…The formation of bulk Cr 2 AlC was achieved by the hot pressing of elemental powders and by the sintering of a mixture of elements or compounds under isostatic pressure at high temperature [1][2][3][4][5][12][13][14][15][16][17][18], by a solid-liquid reaction synthesis [19], by a mechanically induced self-propagation reaction [20] and by a spark plasma sintering [21,22]. Thin-films of Cr 2 AlC and other MAX phases have been grown using magnetron sputtering [6,[9][10][11][23][24][25][26], pulsed cathodic arc deposition [27] as well as by chemical vapor deposition [10,28].…”

Section: Synthesis Of Bulk Max-phase and Thin Filmsmentioning

confidence: 99%

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Characterization of Cr–Al–C and Cr–Al–C–Y films synthesized by High Power Impulse Magnetron Sputtering at a low deposition temperature

et al. 2015

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Section: Structure and Properties Of Cr 2 Alc-max Phasementioning

confidence: 99%

Section: Structure and Properties Of Cr 2 Alc-max Phasementioning

confidence: 99%

Section: Synthesis Of Bulk Max-phase and Thin Filmsmentioning

confidence: 99%

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Characterization of Cr–Al–C and Cr–Al–C–Y films synthesized by High Power Impulse Magnetron Sputtering at a low deposition temperature

et al. 2015

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“…As a result, Ti 2 AlC is not susceptible to spallation during thermal cycling and its upper continuous use temperature is about 1450°C, above such temperature Al 2 TiO 5 formation induces cracking in the Al 2 O 3 scale . On the other hand, Cr 2 AlC has a more peculiar oxidation behavior, due to the formation of an alumina layer over a chromium carbide (Cr 3 C 7 ) underlayer . The formed carbide is thought to be a consequence of the higher difference of Al and Cr outward diffusion kinetics in Cr 2 AlC compared to the other carbide MAX phases.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Oxidation Testing of MAX Phase Composites in the Cr–Ti–Al–C Quaternary System

et al. 2015

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According to the properties determined for the ternary end-members, MAX phases in the quaternary Cr-Ti-Al-C system could be of interest as protective coatings for nuclear fuel cladding in the case of severe accident conditions. In this study, syntheses of 211 and 312 MAX phase compositions were attempted using pressureless reactions starting from Cr, TiH 2 , Al, and C (graphite) powders. It was observed that both the Ti substitution by Cr in Ti 3 AlC 2 and the mutual solubility of Ti 2 AlC and Cr 2 AlC are limited to a few atomic percent. In addition, the remarkable stability of the (Cr 2/3 Ti 1/3 ) 3 AlC 2 MAX phase composition was confirmed. Due to the low miscibility of MAX phases in the Cr-Ti-Al-C system, most samples contained substantial amounts of TiC x and Al-Cr alloys as secondary phases, thus forming composite materials. After sintering, all samples were submitted to a single oxidation test (12 h at 1400°C in air) to identify compositions potentially offering high-temperature oxidation resistance and so warranting further investigation. In addition to (Cr 0.95 Ti 0.05 ) 2 AlC, composite samples containing substantial quantities of Al 8 Cr 5 and AlCr 2 formed a stable and passivating Al 2 O 3 scale, whereas the other samples were fully oxidized.

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“…However, it was proposed that the formation of less protective and relatively weak TiO 2 needs to be avoided, in order to achieve better mechanical properties [5,9]. The quest for the development of self-healing MAX phase materials that produce only α-Al 2 O 3 along a crack zone after high temperature oxidation has directed research towards the study of Cr 2 AlC [10][11][12][13][14]. Yang et al [8] investigated the oxidation kinetics of bulk Cr 2 AlC at 1100°C for 40 h. They reported that the diffusion of Al along oxide grain boundaries dominated the self-healing kinetics.…”

Section: Introductionmentioning

confidence: 99%

Nano-scale Si segregation and precipitation in Cr₂Al(Si)C MAX phase coatings impeding grain growth during oxidation

Pradeep

Chang

Kovács

et al. 2019

Materials Research Letters

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We recently reported that the columnar grain width of Cr 2 AlC MAX phase coatings increases during oxidation (4 h at 1120°C) by 80%, while for 0.7 at.% Si additions to Cr 2 AlC, coarsening of only 12% was observed. Here, we use nm scale compositional and microstructural investigations to identify significant differences between Cr 2 AlC and Cr 2 Al(Si)C. In particular, needle-shaped precipitates coarsen into globular Cr 3 Si precipitates upon oxidation in the Si-containing MAX phase. We infer that the presence of these precipitates, which are located predominantly along grain boundaries in the MAX phase, retards coarsening during oxidation by Zener pinning. IMPACT STATEMENT This is the first report of Zener pinning in MAX phases. We show that Si additions to Cr 2 AlC cause the formation of precipitates, which retard grain coarsening during oxidation.

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Long-Time Oxidation of Cr2AlC Between 700 and 1,000 °C in Air

Cited by 47 publications

References 14 publications

Characterization of Cr–Al–C and Cr–Al–C–Y films synthesized by High Power Impulse Magnetron Sputtering at a low deposition temperature

Characterization of Cr–Al–C and Cr–Al–C–Y films synthesized by High Power Impulse Magnetron Sputtering at a low deposition temperature

Synthesis and Oxidation Testing of MAX Phase Composites in the Cr–Ti–Al–C Quaternary System

Nano-scale Si segregation and precipitation in Cr₂Al(Si)C MAX phase coatings impeding grain growth during oxidation

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Long-Time Oxidation of Cr2AlC Between 700 and 1,000 °C in Air

Cited by 47 publications

References 14 publications

Characterization of Cr–Al–C and Cr–Al–C–Y films synthesized by High Power Impulse Magnetron Sputtering at a low deposition temperature

Characterization of Cr–Al–C and Cr–Al–C–Y films synthesized by High Power Impulse Magnetron Sputtering at a low deposition temperature

Synthesis and Oxidation Testing of MAX Phase Composites in the Cr–Ti–Al–C Quaternary System

Nano-scale Si segregation and precipitation in Cr2Al(Si)C MAX phase coatings impeding grain growth during oxidation

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Product

Resources

About

Nano-scale Si segregation and precipitation in Cr₂Al(Si)C MAX phase coatings impeding grain growth during oxidation