Oxidation and self-healing behaviour of spark plasma sintered Ta2AlC

Ann Sophie M Farle; Julia Stikkelman; Sybrand van der Zwaag; Willem G. Sloof

doi:10.1016/j.jeurceramsoc.2017.01.004

Oxidation and self-healing behaviour of spark plasma sintered Ta₂AlC

Ann Sophie M Farle^*, Julia Stikkelman, Sybrand van der Zwaag, Willem G. Sloof

^*Corresponding author for this work

Novel Aerospace Materials

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18 Citations (Scopus)

Abstract

Self-healing and oxidation of spark plasma sintered Ta₂AlC was investigated using a newly developed wedge loaded compact specimen to determine strength recovery in a single specimen. Previous work had predicted dominant Al oxidation leading to dense and strong reaction products to result in favourable healing properties. However, crack-gap filling and strength recovery of Ta₂AlC were not achieved by oxidation at 600 °C. Oxidation below 900 °C in synthetic and atmospheric air resulted in porous Ta-oxides, with no Al₂O₃ formation. DTA up to 1200 °C revealed a two-step reaction process with the final products Ta₂O₅ and TaAlO₄. The study shows that the kinetics may overrule the self-healing MAX-phase design criteria based on thermodynamics.

Original language	English
Pages (from-to)	1969-1974
Journal	Journal of the European Ceramic Society
Volume	37
Issue number	5
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2017.01.004
Publication status	Published - 2017

Keywords

Oxidation
Self-healing
Spark plasma sintering
TaAlC MAX phase

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10.1016/j.jeurceramsoc.2017.01.004

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title = "Oxidation and self-healing behaviour of spark plasma sintered Ta2AlC",

abstract = "Self-healing and oxidation of spark plasma sintered Ta2AlC was investigated using a newly developed wedge loaded compact specimen to determine strength recovery in a single specimen. Previous work had predicted dominant Al oxidation leading to dense and strong reaction products to result in favourable healing properties. However, crack-gap filling and strength recovery of Ta2AlC were not achieved by oxidation at 600 °C. Oxidation below 900 °C in synthetic and atmospheric air resulted in porous Ta-oxides, with no Al2O3 formation. DTA up to 1200 °C revealed a two-step reaction process with the final products Ta2O5 and TaAlO4. The study shows that the kinetics may overrule the self-healing MAX-phase design criteria based on thermodynamics.",

keywords = "Oxidation, Self-healing, Spark plasma sintering, TaAlC MAX phase",

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AU - Farle, Ann Sophie M

AU - Stikkelman, Julia

AU - van der Zwaag, Sybrand

AU - Sloof, Willem G.

PY - 2017

Y1 - 2017

N2 - Self-healing and oxidation of spark plasma sintered Ta2AlC was investigated using a newly developed wedge loaded compact specimen to determine strength recovery in a single specimen. Previous work had predicted dominant Al oxidation leading to dense and strong reaction products to result in favourable healing properties. However, crack-gap filling and strength recovery of Ta2AlC were not achieved by oxidation at 600 °C. Oxidation below 900 °C in synthetic and atmospheric air resulted in porous Ta-oxides, with no Al2O3 formation. DTA up to 1200 °C revealed a two-step reaction process with the final products Ta2O5 and TaAlO4. The study shows that the kinetics may overrule the self-healing MAX-phase design criteria based on thermodynamics.

AB - Self-healing and oxidation of spark plasma sintered Ta2AlC was investigated using a newly developed wedge loaded compact specimen to determine strength recovery in a single specimen. Previous work had predicted dominant Al oxidation leading to dense and strong reaction products to result in favourable healing properties. However, crack-gap filling and strength recovery of Ta2AlC were not achieved by oxidation at 600 °C. Oxidation below 900 °C in synthetic and atmospheric air resulted in porous Ta-oxides, with no Al2O3 formation. DTA up to 1200 °C revealed a two-step reaction process with the final products Ta2O5 and TaAlO4. The study shows that the kinetics may overrule the self-healing MAX-phase design criteria based on thermodynamics.

KW - Oxidation

KW - Self-healing

KW - Spark plasma sintering

KW - TaAlC MAX phase

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M3 - Article

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VL - 37

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JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 5

ER -

Oxidation and self-healing behaviour of spark plasma sintered Ta₂AlC

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Keywords

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