Ablation behavior of (TiZrHfNbTa)C high-entropy ceramics with the addition of SiC secondary under an oxyacetylene flame

Guo, Wenjian; Hu, Jian; Ye, Yicong; Bai, Shuxin

doi:10.1016/j.ceramint.2022.01.149

Cited by 26 publications

(6 citation statements)

References 20 publications

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“…[24] and (TiZrHfNbTa)C–20‐vol% SiC (2.1 µm s −1 , oxyacetylene flame, ∼2000°C, 120 s) in Ref. [30]. It should also be noted that the temperature gradient and combustion product generated by oxyacetylene flame would affect the testing process, as compared with the plasma flame method 35 .…”

Section: Resultsmentioning

confidence: 99%

“…C f /HEC composites with a SiC interlayer, with a low linear ablation rate of 2.89 µm s −1 at ∼2430°C, showed an improved ablation resistance compared to many C f /UHTC composites 29 . (TiZrHfNbTa)C–20 vol% SiC composite showed lower line ablation rate (2.1 µm s −1 ) than (TiZrHfNbTa)C ceramic (3.6 µm s −1 ) 30 . However, the understanding of the underlying oxidation mechanisms for the improved ablation resistance of HEC–SiC composites is still lacking, and there has been no investigation of the effect of the SiC content.…”

Section: Introductionmentioning

confidence: 94%

“…29 (TiZrHfNbTa)C-20 vol% SiC composite showed lower line ablation rate (2.1 µm s −1 ) than (TiZrHfNbTa)C ceramic (3.6 µm s −1 ). 30 However, the understanding of the underlying oxidation mechanisms for the improved ablation resistance of HEC-SiC composites is still lacking, and there has been no investigation of the effect of the SiC content.…”

Section: Introductionmentioning

confidence: 99%

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Ablation behavior of (Hf–Ta–Zr–Nb–Ti)C high‐entropy carbide and (Hf–Ta–Zr–Nb–Ti)C–xSiC composites

Wang

Yin

et al. 2022

J Am Ceram Soc.

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The ablation behavior of (Hf-Ta-Zr-Nb-Ti)C high-entropy carbide (HEC-0) was investigated using a plasma flame in air for different times (60, 90, and 120 s) at about 2100 • C. The effect of SiC content on the ablation resistance of HEC-xSiC composites (x = 10 and 20 vol%) was also studied. The linear ablation rate of HEC-0 decreases with increasing ablation time, showing the positive role of the oxide layer with a complex composition. The linear ablation rate of HEC-10 vol% SiC (0.3 µm s −1 ) is only a 10th of that of HEC-0, showing a significant improvement in ablation resistance, probably due to the formation of a protective oxide layer containing melted SiO 2 and refractory Hf-Zr-Si-O oxides.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Ablation behavior of (Hf–Ta–Zr–Nb–Ti)C high‐entropy carbide and (Hf–Ta–Zr–Nb–Ti)C–xSiC composites

Wang

Yin

et al. 2022

J Am Ceram Soc.

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“…Compared to HEAs, HECs have larger space for improvement of the properties expanding through band structure and phonon engineering [23]. In contrast to conventional ceramics, HECs have been reported to possess excellent mechanical properties, such as superior-hardness, lower thermal conductivity (k), good thermodynamic stability, and improved corrosion and oxidation resistance [28][29][30][31]. Therefore, the high-entropy concept is a novel strategy for UHTCs due to low thermal conductivity and excellent thermal stability of such materials [28,32].…”

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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“…The third one is property evaluation, including mechanical properties [6,20,24,35,39], thermal properties [19,27,29,40,41], oxidation resistance [22,[42][43][44][45], irradiation resistance [21,46], electromagnetic wave absorbing properties [47,48], etc. [18,49].…”

Section: Introductionmentioning

confidence: 99%

Equiatomic 9-cation high-entropy carbide ceramics of the IVB, VB, and VIB groups and thermodynamic analysis of the sintering process

et al. 2022

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The preparation of high-entropy (HE) ceramics with designed composition is essential for verifying the formability models and evaluating the properties of the ceramics. However, inevitable oxygen contamination in non-oxide ceramics will result in the formation of metal oxide impurity phases remaining in the specimen or even escaping from the specimen during the sintering process, making the elemental compositions of the HE phase deviated from the designed ones. In this work, the preparation and thermodynamic analysis during the processing of equiatomic 9-cation HE carbide (HEC9) ceramics of the IVB, VB, and VIB groups were studied focusing on the removing of the inevitable oxygen impurity existed in the starting carbide powders and the oxygen contamination during the powder mixing processing. The results demonstrate that densification by spark plasma sintering (SPS) by directly using the mixed powders of the corresponding single-component carbides will inhibit the oxygen-removing carbothermal reduction reactions, and most of the oxide impurities will remain in the sample as (Zr,Hf)O2 phase. Pretreatment of the mixed powders at high temperatures in vacuum will remove most part of the oxygen impurity but result in a remarkable escape of gaseous Cr owing to the oxygen-removing reaction between Cr3C2 and various oxide impurities. It is found that graphite addition enhances the oxygen-removing effect and simultaneously prevents the escape of gaseous Cr. On the other hand, although WC, VC, and Mo2C can also act as oxygen-removing agents, there is no metal-containing gaseous substance formation in the temperature range of this study. By using the heat-treated powders with added graphite, equiatomic HEC9 ceramics were successfully prepared by SPS.

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Ablation behavior of (TiZrHfNbTa)C high-entropy ceramics with the addition of SiC secondary under an oxyacetylene flame

Cited by 26 publications

References 20 publications

Ablation behavior of (Hf–Ta–Zr–Nb–Ti)C high‐entropy carbide and (Hf–Ta–Zr–Nb–Ti)C–xSiC composites

Ablation behavior of (Hf–Ta–Zr–Nb–Ti)C high‐entropy carbide and (Hf–Ta–Zr–Nb–Ti)C–xSiC composites

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

Equiatomic 9-cation high-entropy carbide ceramics of the IVB, VB, and VIB groups and thermodynamic analysis of the sintering process

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Ablation behavior of (TiZrHfNbTa)C high-entropy ceramics with the addition of SiC secondary under an oxyacetylene flame

Cited by 26 publications

References 20 publications

Ablation behavior of (Hf–Ta–Zr–Nb–Ti)C high‐entropy carbide and (Hf–Ta–Zr–Nb–Ti)C–xSiC composites

Ablation behavior of (Hf–Ta–Zr–Nb–Ti)C high‐entropy carbide and (Hf–Ta–Zr–Nb–Ti)C–xSiC composites

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

Equiatomic 9-cation high-entropy carbide ceramics of the IVB, VB, and VIB groups and thermodynamic analysis of the sintering process

Contact Info

Product

Resources

About

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