β→α Phase Transformation and Properties of Solid-State-Sintered SiC Ceramics with TaC Addition
Dense SiC-based composite ceramics were fabricated by means of the ex situ addition of TaC using solid-state spark plasma sintering (SPS). Commercially available β-SiC and TaC powders were chosen as raw materials. Electron backscattered diffraction (EBSD) analysis was conducted to investigate the gr...
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MDPI AG
2023-05-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/10/3787 |
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| author | Shiyi Zheng Buhao Zhang Xuejian Liu Zhongming Chen Zhengren Huang Jie Yin |
| author_facet | Shiyi Zheng Buhao Zhang Xuejian Liu Zhongming Chen Zhengren Huang Jie Yin |
| author_sort | Shiyi Zheng |
| collection | DOAJ |
| description | Dense SiC-based composite ceramics were fabricated by means of the ex situ addition of TaC using solid-state spark plasma sintering (SPS). Commercially available β-SiC and TaC powders were chosen as raw materials. Electron backscattered diffraction (EBSD) analysis was conducted to investigate the grain boundary mapping of SiC-TaC composite ceramics. With the increase in TaC, the misorientation angles of the α-SiC phase shifted to a relatively small range. It was deduced that the ex situ pinning stress from TaC greatly suppressed the growth of α-SiC grains. The low β→α transformability of the specimen with the composition of SiC-20 vol.% TaC (ST-4) implied that a possible microstructure of newly nucleated α-SiC embedded within metastable β-SiC grains, which could have been responsible for the improvement in strength and fracture toughness. The as-sintered SiC-20 vol.% TaC (ST-4) composite ceramic had a relative density of 98.0%, a bending strength of 708.8 ± 28.7 MPa, a fracture toughness of 8.3 ± 0.8 MPa·m<sup>1/2</sup>, an elastic modulus of 384.9 ± 28.3 GPa and a Vickers hardness of 17.5 ± 0.4 GPa. |
| first_indexed | 2024-03-11T03:32:19Z |
| format | Article |
| id | doaj.art-686363fcaccf410ea76e27feb5fe6dae |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T03:32:19Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-686363fcaccf410ea76e27feb5fe6dae2023-11-18T02:16:08ZengMDPI AGMaterials1996-19442023-05-011610378710.3390/ma16103787β→α Phase Transformation and Properties of Solid-State-Sintered SiC Ceramics with TaC AdditionShiyi Zheng0Buhao Zhang1Xuejian Liu2Zhongming Chen3Zhengren Huang4Jie Yin5State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, ChinaState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, ChinaState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, ChinaState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, ChinaState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, ChinaState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, ChinaDense SiC-based composite ceramics were fabricated by means of the ex situ addition of TaC using solid-state spark plasma sintering (SPS). Commercially available β-SiC and TaC powders were chosen as raw materials. Electron backscattered diffraction (EBSD) analysis was conducted to investigate the grain boundary mapping of SiC-TaC composite ceramics. With the increase in TaC, the misorientation angles of the α-SiC phase shifted to a relatively small range. It was deduced that the ex situ pinning stress from TaC greatly suppressed the growth of α-SiC grains. The low β→α transformability of the specimen with the composition of SiC-20 vol.% TaC (ST-4) implied that a possible microstructure of newly nucleated α-SiC embedded within metastable β-SiC grains, which could have been responsible for the improvement in strength and fracture toughness. The as-sintered SiC-20 vol.% TaC (ST-4) composite ceramic had a relative density of 98.0%, a bending strength of 708.8 ± 28.7 MPa, a fracture toughness of 8.3 ± 0.8 MPa·m<sup>1/2</sup>, an elastic modulus of 384.9 ± 28.3 GPa and a Vickers hardness of 17.5 ± 0.4 GPa.https://www.mdpi.com/1996-1944/16/10/3787carbidessolid-state sinteringphase transformationstrengthtoughness |
| spellingShingle | Shiyi Zheng Buhao Zhang Xuejian Liu Zhongming Chen Zhengren Huang Jie Yin β→α Phase Transformation and Properties of Solid-State-Sintered SiC Ceramics with TaC Addition Materials carbides solid-state sintering phase transformation strength toughness |
| title | β→α Phase Transformation and Properties of Solid-State-Sintered SiC Ceramics with TaC Addition |
| title_full | β→α Phase Transformation and Properties of Solid-State-Sintered SiC Ceramics with TaC Addition |
| title_fullStr | β→α Phase Transformation and Properties of Solid-State-Sintered SiC Ceramics with TaC Addition |
| title_full_unstemmed | β→α Phase Transformation and Properties of Solid-State-Sintered SiC Ceramics with TaC Addition |
| title_short | β→α Phase Transformation and Properties of Solid-State-Sintered SiC Ceramics with TaC Addition |
| title_sort | β α phase transformation and properties of solid state sintered sic ceramics with tac addition |
| topic | carbides solid-state sintering phase transformation strength toughness |
| url | https://www.mdpi.com/1996-1944/16/10/3787 |
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