Fluorite-pyrochlore structured high-entropy oxides: Tuning the ratio of B-site cations for resistance to CMAS corrosion

Cheng, Fuhao; Meng, Ziqian; Cheng, Chufei; Hou, Jiadong; Liu, Yufeng; Ren, Bei; Hu, Haiyan; Gao, Feng; Miao, Yang; Wang, Xiaomin

doi:10.1016/j.corsci.2023.111199

Cited by 13 publications

(2 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Taking a few examples of extreme environments utilizing barrier coatings, in gas turbine engines coating interactions with calcia-magnesia-alumina-silicate (CMAS) glass are a major issue. CMAS is formed from engine ingestion of volcanic ash, sand, and runway dust [18,48], and can corrode oxide coatings and exacerbate spallation of coatings off the base material. As such there has been an explosion of research into the area of HECs for use in barrier coating applications with many promising candidates and crystal structures.…”

Section: Barrier Coatingsmentioning

confidence: 99%

“…The A 2 B 2 O 7 formulation for these materials can form in a disordered fluorite structure or a pyrochlore-type, with A 3+ and B 4+ cation sublattices, though it is possible to include off-nominal charged cations into these sites [56]. This family of compositions presents even more possible combinations with entropic disorder in the A-site [50,51,[56][57][58][59][60][61][62], B-site [52,63,64], or both [48,49,56,65,66], allowing for a massive compositional space for tuning of properties of interest. Of these, A-site disordered zirconates have received the most attention, with zirconium, hafnium, or cerium being the single B-site occupant.…”

Section: Barrier Coatingsmentioning

confidence: 99%

See 1 more Smart Citation

High entropy ceramics for applications in extreme environments

Ward,

Wilkerson,

Musicó

et al. 2024

J. Phys. Mater.

View full text Add to dashboard Cite

Compositionally complex materials have demonstrated extraordinary promise for structural robustness in extreme environments. Of these, the most commonly thought of are high entropy alloys, where chemical complexity grants uncommon combinations of hardness, ductility, and thermal resilience. In contrast to these metal-metal bonded systems, the addition of ionic and covalent bonding has led to the discovery of high entropy ceramics. These materials also possess outstanding structural, thermal, and chemical robustness but with a far greater variety of functional properties which enable access to continuously controllable magnetic, electronic, and optical phenomena. In this experimentally focused perspective, we outline the potential for high entropy ceramics in functional applications under extreme environments, where intrinsic stability may provide a new path toward inherently hardened device design. Current works on high entropy carbides, actinide bearing ceramics, and high entropy oxides are reviewed in the areas of radiation, high temperature, and corrosion tolerance where the role of local disorder is shown to create pathways toward self-healing and structural robustness. In this context, new strategies for creating future electronic, magnetic, and optical devices to be operated in harsh environments are outlined.

show abstract

Section: Barrier Coatingsmentioning

confidence: 99%

Section: Barrier Coatingsmentioning

confidence: 99%

High entropy ceramics for applications in extreme environments

Ward,

Wilkerson,

Musicó

et al. 2024

J. Phys. Mater.

View full text Add to dashboard Cite

show abstract

Medium‐Entropy Monosilicates Deliver High Corrosion Resistance to Calcium‐Magnesium Aluminosilicate Molten Salt

Chen,

Wang,

Huang

et al. 2024

Advanced Science

View full text Add to dashboard Cite

For decreasing the global cost of corrosion, it is essential to understand the intricate mechanisms of corrosion and enhance the corrosion resistance of materials. However, the ambiguity surrounding the dominant mechanism of calcium‐magnesium aluminosilicate (CMAS) molten salt corrosion in extreme environments hinders the mix‐and‐matching of the key rare earth elements for increasing the resistance of monosilicates against corrosion of CMAS. Herein, an approach based on correlated electron microscopy techniques combined with density functional theory calculations is presented to elucidate the complex interplay of competing mechanisms that control the corrosion of CMAS of monosilicates. These findings reveal a competition between thermodynamics and kinetics that relies on the temperatures and corrosion processes. Innovative medium‐entropy monosilicates with exceptional corrosion resistance even at 1500 °C are developed. This is achieved by precisely modulating the radii of rare earth ions in monosilicates to strike a delicate balance between the competition in thermodynamics and kinetics. After 50 and 100 h of corrosion, the thinnest reactive layers are measured to be only 28.8 and 35.4 µm, respectively.

show abstract

Challenges and Strategies for Synthesizing High Performance Micro and Nanoscale High Entropy Oxide Materials

Zhang,

Jia,

Yan

2024

Small

View full text Add to dashboard Cite

High‐entropy oxide micro/nano materials (HEO MNMs) have shown broad application prospects and have become hot materials in recent years. This review comprehensively provides an overview of the latest developments and covers key aspects of HEO MNMs, by discussing design principles, computer‐aided structural design, synthesis challenges and strategies, as well as application areas. The analysis of the synthesis process includes the role of high‐throughput process in large‐scale synthesis of HEOs MNMs, along with the effects of temperature elevation and undercooling on the formation of HEO MNMs. Additionally, the article summarizes the application of high‐precision and in situ characterization devices in the field of HEO MNMs, offering robust support for related research. Finally, a brief introduction to the main applications of HEO MNMs is provided, emphasizing their key performances. This review offers valuable guidance for future research on HEO MNMs, outlining critical issues and challenges in the current field.

show abstract

Fluorite-pyrochlore structured high-entropy oxides: Tuning the ratio of B-site cations for resistance to CMAS corrosion

Cited by 13 publications

References 44 publications

High entropy ceramics for applications in extreme environments

High entropy ceramics for applications in extreme environments

Medium‐Entropy Monosilicates Deliver High Corrosion Resistance to Calcium‐Magnesium Aluminosilicate Molten Salt

Challenges and Strategies for Synthesizing High Performance Micro and Nanoscale High Entropy Oxide Materials

Contact Info

Product

Resources

About