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Advances in Applied Ceramics
Structural, Functional and Bioceramics
Volume 121, 2022 - Issue 2
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Review

Processing and properties of high entropy carbides

Yichen WangSchool of Engineering and Materials Science, Queen Mary University of London, London, UKCorrespondence[email protected]
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Pages 57-78 | Received 30 Jul 2021, Accepted 01 Dec 2021, Published online: 17 Dec 2021

Figures & data

Table 1. The selected data of ab-initio calculated EFA for nine 5-metal carbides which have been verified by experiments [Citation24].

Figure 1. (a) XRD patterns of powders synthesised at different temperatures; (b) SEM image and (c) TEM image with the corresponding selected area electron diffraction (SAED) pattern of (HfZrTiTaNb)C powders synthesised at 1950°C [Citation50].

Figure 1. (a) XRD patterns of powders synthesised at different temperatures; (b) SEM image and (c) TEM image with the corresponding selected area electron diffraction (SAED) pattern of (HfZrTiTaNb)C powders synthesised at 1950°C [Citation50].

Figure 2. (a) HAADF image and (b–f) EDS mapping images of (HfZrTiTaNb)C powders [Citation50].

Figure 2. (a) HAADF image and (b–f) EDS mapping images of (HfZrTiTaNb)C powders [Citation50].

Figure 3. Schematic illustration for a typical PDC route [Citation59].

Figure 3. Schematic illustration for a typical PDC route [Citation59].

Figure 4. XRD patterns of (a) nearly stoichiometric and (b) over stoichiometric (CrCuNbTiY)C coatings deposited at different temperatures (s is the substrate) [Citation68].

Figure 4. XRD patterns of (a) nearly stoichiometric and (b) over stoichiometric (CrCuNbTiY)C coatings deposited at different temperatures (s is the substrate) [Citation68].

Figure 5. TEM images of NEC and TaWC films deposited at 300°C and 600°C [Citation46].

Figure 5. TEM images of NEC and TaWC films deposited at 300°C and 600°C [Citation46].

Figure 6. Microstructure of the (HfTaZrNb)C sintered for 7 min at 2300°C: (a) SEM; and (b) EBSD [Citation78].

Figure 6. Microstructure of the (HfTaZrNb)C sintered for 7 min at 2300°C: (a) SEM; and (b) EBSD [Citation78].

Figure 7. STEM and EDS maps of the (HfTaZrNb)C sintered for 7 min at 2300°C [Citation78].

Figure 7. STEM and EDS maps of the (HfTaZrNb)C sintered for 7 min at 2300°C [Citation78].

Figure 8. ABF (left) and HAADF (right) micrographs along the [011] zone axis (Fm-3 m) of the (HfTaZrNb)C sintered for 7 min at 2300°C [Citation78].

Figure 8. ABF (left) and HAADF (right) micrographs along the [011] zone axis (Fm-3 m) of the (HfTaZrNb)C sintered for 7 min at 2300°C [Citation78].

Figure 9. XRD spectra of (HfZrTaNbTi)C before and after annealing at 500, 800 and 1140°C for 1 h in Ar [Citation49].

Figure 9. XRD spectra of (HfZrTaNbTi)C before and after annealing at 500, 800 and 1140°C for 1 h in Ar [Citation49].

Figure 10. Thermal conductivity of dense carbides with different numbers of metals at RT [Citation36,Citation79,Citation80,Citation86,Citation102–107]. The relative density of multi-metal carbides was labelled due to the large effect of porosity on thermal conductivity.

Figure 10. Thermal conductivity of dense carbides with different numbers of metals at RT [Citation36,Citation79,Citation80,Citation86,Citation102–107]. The relative density of multi-metal carbides was labelled due to the large effect of porosity on thermal conductivity.

Figure 11. Thermal diffusivity of high entropy carbides, alloys and metallic glasses at RT-600°C [Citation26].

Figure 11. Thermal diffusivity of high entropy carbides, alloys and metallic glasses at RT-600°C [Citation26].

Table 2. Composition, experimental procedures, density, roughness, grain size, lattice parameter and mechanical properties of the reported HEC ceramics and coatings.

Figure 12. (a) Hardness and (b) elastic modulus of 7 HECs along with the ROM value against the VEC [Citation18].

Figure 12. (a) Hardness and (b) elastic modulus of 7 HECs along with the ROM value against the VEC [Citation18].

Figure 13. Fracture toughness-Vickers hardness of HECs compared to those of carbides and composites, and some concerned composites [Citation26].

Figure 13. Fracture toughness-Vickers hardness of HECs compared to those of carbides and composites, and some concerned composites [Citation26].

Figure 14. TGA-DSC results and SEM images after oxidation of (Hf–Ta–Zr–Nb)C, ZrC, NbC, HfC, TaC and (Hf–Ta)C powders [Citation132].

Figure 14. TGA-DSC results and SEM images after oxidation of (Hf–Ta–Zr–Nb)C, ZrC, NbC, HfC, TaC and (Hf–Ta)C powders [Citation132].

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