Synthesis of Hf6Ta2O17 superstructure via spark plasma sintering for improved oxidation resistance of multi-component ultra-high temperature ceramics

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

doi:10.1016/j.ceramint.2022.09.050

Cited by 14 publications

(5 citation statements)

References 19 publications

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“…It is thermally stable up to ≈2523 K [ 58 ] and has low oxygen diffusion, [ 57 ] resulting in a passive protective layer against further oxidation. [ 33,59 ] The presence of this phase is likely contributing to the reduction in the ablation rate and oxide scale thickness in our samples.…”

Section: Resultsmentioning

confidence: 99%

Phase Transitions and Oxidation Behavior During Oxyacetylene Torch Testing of TaC–HfC Solid Solutions

et al. 2023

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Tantalum carbide (TaC) and hafnium carbide (HfC) have some of the highest melting temperatures among the transition metal carbides, borides, and nitrides, making them promising materials for high‐speed flight and high‐temperature structural applications. Solid solutions of TaC and HfC are of particular interest due to their enhanced oxidation resistance compared to pure TaC or HfC. This study looks at the effect of Hf content on the oxidation resistance of TaC–HfC sintered specimens. Five compositions are fabricated into bulk samples using spark plasma sintering (2173 K, 50 MPa, 10 min hold). Oxidation behavior of a subset of the compositions (100 vol% TaC, 80 vol% TaC + 20 vol% HfC, and 50 vol% TaC + 50 vol% HfC) is analyzed using an oxyacetylene torch for 60 s. The TaC–HfC samples exhibit a reduction in the oxide scale thickness and the mass ablation rate with increasing HfC content. The improved oxidation resistance can be attributed to the formation of a Hf6Ta2O17 phase. This phase enhances oxidation resistance by reducing oxygen diffusion and serving as a protective layer for the unoxidized material. The superior oxidation resistance of TaC–HfC samples makes these materials strong contenders for the development of high‐speed flight coatings.

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Section: Resultsmentioning

confidence: 99%

Phase Transitions and Oxidation Behavior During Oxyacetylene Torch Testing of TaC–HfC Solid Solutions

et al. 2023

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“…Ultra-high-temperature ceramics (UHTCs) have high melting points, outstanding oxidation resistance, along with excellent mechanical properties [1][2][3][4]. They have attracted increasing attention for aerospace applications, such as leading edges and a nose cone of hypersonic vehicles, as well as surface coatings for SiC-based ceramic matrix composites [5][6][7][8][9][10].…”

Section: Introduction mentioning

confidence: 99%

High-entropy rare-earth diborodicarbide: A novel class of high-entropy (Y _0.25Yb _0.25Dy _0.25Er _0.25)B ₂C ₂ ceramics

Xu¹,

Jiang²,

Chen³

et al. 2023

Journal of Advanced Ceramics

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A novel class of high-entropy rare-earth metal diborodicarbide (Y 0.25 Yb 0.25 Dy 0.25 Er 0.25 )B 2 C 2 (HE-REB 2 C 2 ) ceramics was successfully fabricated using the in-situ reactive spark plasma sintering (SPS) technology for the first time. Single solid solution with a typical tetragonal structure was formed, having a homogeneous distribution of four rare-earth elements, such as Y, Yb, Dy, and Er. Coefficients of thermal expansion (CTEs) along the a and c directions (α a and α c ) were determined to be 4.18 and 16.06 μK −1 , respectively. Thermal expansion anisotropy of the as-obtained HE-REB 2 C 2 was attributed to anisotropy of the crystal structure of HE-REB 2 C 2 . The thermal conductivity (k) of HE-REB 2 C 2 was 9.2±0.09 W•m −1 •K −1 , which was lower than that of YB 2 C 2 (19.2±0.07 W•m −1 •K −1 ), DyB 2 C 2 (11.9±0.06 W•m −1 •K −1 ), and ErB 2 C 2 (12.1±0.03 W•m −1 •K −1 ), due to high-entropy effect and sluggish diffusion effect of high-entropy ceramics (HECs). Furthermore, Vickers hardness of HE-REB 2 C 2 was slightly higher than that of REB 2 C 2 owing to the solid solution hardening mechanism of HECs. Typical nano-laminated fracture morphologies, such as kink boundaries, delamination, and slipping were observed at the tip of Vickers indents, suggesting ductile behavior of HE-REB 2 C 2 . This newly investigated class of ductile HE-REB 2 C 2 ceramics expanded the family of HECs to diboridcarbide compounds, which can lead to more research works on high-entropy rare-earth diboridcarbides in the near future. Keywords: high-entropy rare-earth diboridcarbide; (Y 0.25 Yb 0.25 Dy 0.25 Er 0.25 )B 2 C 2 (REB 2 C 2 ); highentropy ceramics (HECs); thermal property; damage tolerance

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“…In the spark plasma sintering (SPS) method, which has been recently developed, powder particles would be sintered under high pressure, high heating rates, and low sintering temperatures, which lead to higher densities in consolidated samples vis-a-vis other methods. 23,24 According to the researches, the effect of SiC and FMG micron-sized metallic glass reinforcements on the dynamic mechanical thermal properties, wear, and hardness of metalbased composites has not been studied. Accordingly, in this research work, for the first time, the microstructure, dynamic mechanical thermal properties, hardness, and wear properties of aluminum hybrid composite with SiC and FMG reinforcements which are produced using the SPS method, will be evaluated.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dry sliding wear and viscoelastic performance of aluminum-based hybrid composites reinforced with SiC and metallic glass particles

Albooyeh

Rezaei

Kafshgari

et al. 2022

Journal of Composite Materials

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In this research, a new type of bulk hybrid composites containing different amounts of Fe-based metallic glass (FMG) and SiC particles were successfully produced. FMG and SiC particles with varying percentages of volume were mixed with pure Al matrix and integrated by spark plasma sintering (SPS) method. The dynamic mechanical thermal properties, coefficient of friction and wear rates, hardness, and density of the composite were investigated. The results showed that the addition of FMG and SiC particles improved the wear resistance, hardness value, and storage modulus and slightly decreased the [Formula: see text] and relative density of pure Al. Also, replacing some SiC particles with FMG particles in the hybrid samples, in addition to the change of the dominant wear mechanism, led to the higher storage modulus and hardness values. It was found that the formation of a mechanically mixed layer during the wear test resulted in a reduction in the coefficient of friction. Compared to pure Al, the amounts of the increase in storage modulus and hardness of samples reinforced with 3 vol. % of SiC and 7 vol. % of FMG particles were 24.70% and 68.40%, respectively. The morphological analysis of the hybrid composites demonstrated that the amorphous structure of the FMG particles was preserved.

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Synthesis of Hf6Ta2O17 superstructure via spark plasma sintering for improved oxidation resistance of multi-component ultra-high temperature ceramics

Cited by 14 publications

References 19 publications

Phase Transitions and Oxidation Behavior During Oxyacetylene Torch Testing of TaC–HfC Solid Solutions

Phase Transitions and Oxidation Behavior During Oxyacetylene Torch Testing of TaC–HfC Solid Solutions

High-entropy rare-earth diborodicarbide: A novel class of high-entropy (Y _0.25Yb _0.25Dy _0.25Er _0.25)B ₂C ₂ ceramics

Dry sliding wear and viscoelastic performance of aluminum-based hybrid composites reinforced with SiC and metallic glass particles

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Synthesis of Hf6Ta2O17 superstructure via spark plasma sintering for improved oxidation resistance of multi-component ultra-high temperature ceramics

Cited by 14 publications

References 19 publications

Phase Transitions and Oxidation Behavior During Oxyacetylene Torch Testing of TaC–HfC Solid Solutions

Phase Transitions and Oxidation Behavior During Oxyacetylene Torch Testing of TaC–HfC Solid Solutions

High-entropy rare-earth diborodicarbide: A novel class of high-entropy (Y 0.25Yb 0.25Dy 0.25Er 0.25)B 2C 2 ceramics

Dry sliding wear and viscoelastic performance of aluminum-based hybrid composites reinforced with SiC and metallic glass particles

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Product

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High-entropy rare-earth diborodicarbide: A novel class of high-entropy (Y _0.25Yb _0.25Dy _0.25Er _0.25)B ₂C ₂ ceramics