Ablation behaviour of (Hf-Ta-Zr-Nb)C high entropy carbide ceramic at temperatures above 2100 °C

Wang, Yichen; Zhang, Buhao; Zhang, Chengyu; Yin, Jie; Reece, Michael J.

doi:10.1016/j.jmst.2021.09.064

Cited by 44 publications

(14 citation statements)

References 39 publications

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“…As shown in Figure 5A, the EDS line scanning results of the oxide layer of HEC‐0‐60 showed that the relative content of Zr and Hf increaseed through the thickness, indicating that the Hf and Zr oxides were richer in the inner oxide layer. This was caused by the preferential formation of the Zr‐ and Hf‐rich oxides at the interface between the oxide layer and the carbide substrate due to their lower formation enthalpy 21,24,32 . The EDS results of the HEC‐0‐90 showed that the Ti was richer in the region near the surface (see the peaks in the yellow circle in Figure 5B), which is consistent with the EDS results from the surface of the HEC‐0‐90.…”

Section: Resultssupporting

confidence: 77%

“…This was caused by the preferential formation of the Zr-and Hf-rich oxides at the interface between the oxide layer and the carbide substrate due to their lower formation enthalpy. 21,24,32 The EDS results of the HEC-0-90 showed that the Ti was richer in the region near the surface (see the peaks in the yellow circle in Figure 5B), which is consistent with the EDS results from the surface of the HEC-0-90. As shown in the EDS results of the HEC-0-120 sample in Figure 5C, the metal scans of HEC-0-120 have many strong ups and downs.…”

Section: Ablation Behavior Of (Hf-ta-zr-nb-ti)c High-entropy Carbidessupporting

confidence: 82%

“…This phenomenon was caused by the preferential oxidation reaction of the group VIB carbides (TiC, ZrC, and HfC) compared to the group VB carbides due to their lower Gibb's free energy. 24…”

Section: Ablation Behavior Of (Hf-ta-zr-nb-ti)c High-entropy Carbidesmentioning

confidence: 99%

“…The ablation resistance of (Hf-Ta-Zr-Nb)C ceramic has been studied using a plasma flame, and the results showed an oxidation-dominant ablation process and a serious melting of oxides on the surface of the oxide layer. 24 Controlling the oxidation rate of carbides is very important for improving their ablation resistance. Our understanding of the ablation processes and mechanisms of HECs is still lacking.…”

Section: Introductionmentioning

confidence: 99%

“…There are some oxidation studies on HECs, 19–23 whereas the study of the ablation behavior of HECs is rare. The ablation resistance of (Hf–Ta–Zr–Nb)C ceramic has been studied using a plasma flame, and the results showed an oxidation‐dominant ablation process and a serious melting of oxides on the surface of the oxide layer 24 . Controlling the oxidation rate of carbides is very important for improving their ablation resistance.…”

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: Resultssupporting

confidence: 77%

Section: Ablation Behavior Of (Hf-ta-zr-nb-ti)c High-entropy Carbidessupporting

confidence: 82%

“…This phenomenon was caused by the preferential oxidation reaction of the group VIB carbides (TiC, ZrC, and HfC) compared to the group VB carbides due to their lower Gibb's free energy. 24…”

Section: Ablation Behavior Of (Hf-ta-zr-nb-ti)c High-entropy Carbidesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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Rapid Experimental Screening of High‐Entropy Diborides for Superior Oxidation Resistance

Tang,

Wen,

Liu

et al. 2023

Adv Funct Materials

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Due to the huge composition space, composition screening is of great importance to the optimization of high‐entropy diborides (HEBs) with exceptional oxidation resistance. However, related studies are lacking. Here, a novel rapid, effective strategy to fully screen the compositions on the oxidation resistance of HEBs is proposed. Specifically, the synthesis of the equiatomic 1‐ to 9‐cation multicomponent diborides of the IVB, VB, and VIB groups in seconds via an ultrafast ultrahigh‐temperature synthesis technique is realized. Subsequently, combined with the thermogravimetric analysis and first‐principles calculations, the roles of incorporated elements are systematically explored. The results show that Zr, Cr, Ta, Nb, and W elements are the key to the improved oxidation resistance of HEBs, while Ti, Mo, and V elements are destructive. In particular, the positive roles of metal elements are mainly attributed to the partial dissolution of the generated metal oxides into the generated B2O3 glass, which can improve the viscosity of B2O3 and thus enhance its high‐temperature stability and reduce the oxygen diffusion rate, as confirmed by the first‐principles calculations. This study paves a way to rapidly screen the elements in HEBs, which can be a guide for further anti‐oxidation designs.

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Novel high-entropy ultra-high temperature ceramics with enhanced ablation resistance

Zhang,

Liu,

et al. 2024

Rare Met.

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Ablation behaviour of (Hf-Ta-Zr-Nb)C high entropy carbide ceramic at temperatures above 2100 °C

Cited by 44 publications

References 39 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

Rapid Experimental Screening of High‐Entropy Diborides for Superior Oxidation Resistance

Novel high-entropy ultra-high temperature ceramics with enhanced ablation resistance

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