Dual-phase medium-entropy diboride–carbide ceramics with metal element exchange during sintering
Multiphase composition design is a strategy for optimizing the microstructures and properties of ceramic materials through mutual inhibition of grain growth, complementary property improvement, or even mutually reinforcing effects. More interesting phenomena can be expected if chemical interactions...
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Tsinghua University Press
2025-01-01
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| Series: | Journal of Advanced Ceramics |
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| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2024.9221007 |
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| author | Pai Peng Ji-Xuan Liu Xiao-Ting Xin Weichao Bao Yongcheng Liang Fangfang Xu Guo-Jun Zhang |
| author_facet | Pai Peng Ji-Xuan Liu Xiao-Ting Xin Weichao Bao Yongcheng Liang Fangfang Xu Guo-Jun Zhang |
| author_sort | Pai Peng |
| collection | DOAJ |
| description | Multiphase composition design is a strategy for optimizing the microstructures and properties of ceramic materials through mutual inhibition of grain growth, complementary property improvement, or even mutually reinforcing effects. More interesting phenomena can be expected if chemical interactions between the constituent phases exist. In this study, spark plasma sintering was used to prepare fully dense dual-phase (Zr,Hf,Ta)B2–(Zr,Hf,Ta)C ceramics from self-synthesized equimolar medium-entropy diboride and carbide powders. The obtained ceramics were composed of two distinct solid solution phases, the Zr-rich diboride phase and the Ta-rich carbide phase, indicating that metal element exchange occurred between the starting equimolar medium-entropy diboride and carbide phases during sintering. Owing to the mutual grain-boundary pinning effect, fine-grained dual-phase ceramics were obtained. The chemical driving force originating from metal element exchange during the sintering process is considered to promote the densification process of the ceramics. The metal element exchange between the medium-entropy diboride and carbide phases significantly increased the Young’s modulus of the dual-phase ceramics. The dual-phase medium-entropy 50 vol% (Zr,Hf,Ta)B2–50 vol% (Zr,Hf,Ta)C ceramics with the smallest grain size exhibited the highest hardness of 22.4±0.2 GPa. It is inferred that optimized comprehensive properties or performance of dual-phase high-entropy or medium-entropy ceramics of diborides and carbides can be achieved by adjusting both the volume content and the metal element composition of the corresponding starting powders of diborides and carbides. |
| format | Article |
| id | doaj-art-df4db4edd6e14fe69273f860fb915443 |
| institution | Kabale University |
| issn | 2226-4108 2227-8508 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj-art-df4db4edd6e14fe69273f860fb9154432025-01-24T07:52:15ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082025-01-01141922100710.26599/JAC.2024.9221007Dual-phase medium-entropy diboride–carbide ceramics with metal element exchange during sinteringPai Peng0Ji-Xuan Liu1Xiao-Ting Xin2Weichao Bao3Yongcheng Liang4Fangfang Xu5Guo-Jun Zhang6State Key Laboratory of Advanced Fiber Materials, Institute of Functional Materials, College of Materials Science and Engineering, College of Physics, Donghua University, Shanghai 201620, ChinaState Key Laboratory of Advanced Fiber Materials, Institute of Functional Materials, College of Materials Science and Engineering, College of Physics, Donghua University, Shanghai 201620, ChinaState Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, ChinaState Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, ChinaState Key Laboratory of Advanced Fiber Materials, Institute of Functional Materials, College of Materials Science and Engineering, College of Physics, Donghua University, Shanghai 201620, ChinaState Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, ChinaState Key Laboratory of Advanced Fiber Materials, Institute of Functional Materials, College of Materials Science and Engineering, College of Physics, Donghua University, Shanghai 201620, ChinaMultiphase composition design is a strategy for optimizing the microstructures and properties of ceramic materials through mutual inhibition of grain growth, complementary property improvement, or even mutually reinforcing effects. More interesting phenomena can be expected if chemical interactions between the constituent phases exist. In this study, spark plasma sintering was used to prepare fully dense dual-phase (Zr,Hf,Ta)B2–(Zr,Hf,Ta)C ceramics from self-synthesized equimolar medium-entropy diboride and carbide powders. The obtained ceramics were composed of two distinct solid solution phases, the Zr-rich diboride phase and the Ta-rich carbide phase, indicating that metal element exchange occurred between the starting equimolar medium-entropy diboride and carbide phases during sintering. Owing to the mutual grain-boundary pinning effect, fine-grained dual-phase ceramics were obtained. The chemical driving force originating from metal element exchange during the sintering process is considered to promote the densification process of the ceramics. The metal element exchange between the medium-entropy diboride and carbide phases significantly increased the Young’s modulus of the dual-phase ceramics. The dual-phase medium-entropy 50 vol% (Zr,Hf,Ta)B2–50 vol% (Zr,Hf,Ta)C ceramics with the smallest grain size exhibited the highest hardness of 22.4±0.2 GPa. It is inferred that optimized comprehensive properties or performance of dual-phase high-entropy or medium-entropy ceramics of diborides and carbides can be achieved by adjusting both the volume content and the metal element composition of the corresponding starting powders of diborides and carbides.https://www.sciopen.com/article/10.26599/JAC.2024.9221007medium-entropy diboridemedium-entropy carbidedual-phase medium-entropy ceramicsmetal element exchangedensificationmechanical properties |
| spellingShingle | Pai Peng Ji-Xuan Liu Xiao-Ting Xin Weichao Bao Yongcheng Liang Fangfang Xu Guo-Jun Zhang Dual-phase medium-entropy diboride–carbide ceramics with metal element exchange during sintering Journal of Advanced Ceramics medium-entropy diboride medium-entropy carbide dual-phase medium-entropy ceramics metal element exchange densification mechanical properties |
| title | Dual-phase medium-entropy diboride–carbide ceramics with metal element exchange during sintering |
| title_full | Dual-phase medium-entropy diboride–carbide ceramics with metal element exchange during sintering |
| title_fullStr | Dual-phase medium-entropy diboride–carbide ceramics with metal element exchange during sintering |
| title_full_unstemmed | Dual-phase medium-entropy diboride–carbide ceramics with metal element exchange during sintering |
| title_short | Dual-phase medium-entropy diboride–carbide ceramics with metal element exchange during sintering |
| title_sort | dual phase medium entropy diboride carbide ceramics with metal element exchange during sintering |
| topic | medium-entropy diboride medium-entropy carbide dual-phase medium-entropy ceramics metal element exchange densification mechanical properties |
| url | https://www.sciopen.com/article/10.26599/JAC.2024.9221007 |
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