A perspective on challenges and opportunities in developing high entropy-ultra high temperature ceramics

Nisar, Ambreen; Zhang, Cheng; Boesl, Benjamin; Agarwal, Arvind

doi:10.1016/j.ceramint.2020.07.066

A perspective on challenges and opportunities in developing high entropy-ultra high temperature ceramics

Journal Article · Mon Jul 27 00:00:00 EDT 2020 · Ceramics International

DOI:https://doi.org/10.1016/j.ceramint.2020.07.066· OSTI ID:1850388

Nisar, Ambreen ^[1]; Zhang, Cheng ^[2]; Boesl, Benjamin ^[2]; Agarwal, Arvind ^[2]

Florida International Univ. (FIU), Miami, FL (United States). Mechanical and Materials Engineering; Florida International Univ. (FIU), Miami, FL (United States)
Florida International Univ. (FIU), Miami, FL (United States). Mechanical and Materials Engineering

The emergence of a new class of high entropy ultra-high temperature ceramics (HE-UHTCs) is expected to possess exceptionally superior mechanical, oxidation, and erosion resistance as compared to conventional UHTCs. The improvement in the properties of HE-UHTCs is attributed to the high configurational entropy of the multi-component system stabilized into a single-phase, but with little discussion on entropy contributions. This perspective article presents a viewpoint on the critical scientific question regarding the actual role entropy plays in stabilizing and enhancing the thermo-mechanical properties of a multi-component system. The high throughput first-principle calculations, which can provide the entropy formation ability (EFA) of thermodynamically stable HE-UHTCs, can prove to be valuable toolset to this puzzle. HE-UHTCs show enhancement in the mechanical properties much higher than the predicted rule of the mixture, which cannot traditionally be explained by a mere solid solution formation effect. Additionally, isothermal oxidation studies of HE-UHTCs limited to furnace testing state remarkable oxidation resistance which is attributed to the passivity of complex, layered structure, and composition of the oxide scale. However, whether all the constituents in the HE-UHTC system react simultaneously or preferential oxidation takes place needs to be addressed. To address all these issues, an integrated computational and experimental approach has been postulated towards designing a thermal protection system (TPS) for re-entry applications. Succeeding the approach will provide new opportunities in the compositional space of HE-UHTCs with tailored properties.

View Accepted Manuscript (DOE)

Research Organization:: Florida International Univ. (FIU), Miami, FL (United States); Univ. of Texas at El Paso, TX (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003865

OSTI ID:: 1850388

Alternate ID(s):: OSTI ID: 1668083
OSTI ID: 1958030
OSTI ID: 1958098

Journal Information:: Ceramics International, Journal Name: Ceramics International Journal Issue: PA Vol. 46; ISSN 0272-8842

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Entropic stabilization
High entropy (HE)
Layered oxide scale
Materials Science
Thermal protection system (TPS)
Ultra-high temperature ceramics (UHTCs)

A perspective on challenges and opportunities in developing high entropy-ultra high temperature ceramics

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