Advanced Fabrication Method and Mechanical Properties of Silicon Nitride/Boron Nitride Fibrous Monolithic Ceramics
Silicon nitride ceramics are regarded as a promising material for high-temperature structural applications due to their remarkable characteristics, including high strength, hardness, thermal conductivity, low dielectric properties, and resistance to creep at elevated temperatures. However, their sus...
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MDPI AG
2023-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/18/6130 |
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| author | Qingqing Chen Yuan Zhang Liuxin Chao Ningning Dong Yu Zhou Guobing Ying |
| author_facet | Qingqing Chen Yuan Zhang Liuxin Chao Ningning Dong Yu Zhou Guobing Ying |
| author_sort | Qingqing Chen |
| collection | DOAJ |
| description | Silicon nitride ceramics are regarded as a promising material for high-temperature structural applications due to their remarkable characteristics, including high strength, hardness, thermal conductivity, low dielectric properties, and resistance to creep at elevated temperatures. However, their susceptibility to catastrophic fracture at high temperatures remains a concern. Herein, Si<sub>3</sub>N<sub>4</sub>/BN fibrous monolithic ceramics have been successfully prepared by employing wet-spinning and hot-pressing techniques. We delved into the design and optimization of the spinning slurry and examined how the Si<sub>3</sub>N<sub>4</sub>/BN fiber diameter affects the ceramics’ microstructure and mechanical properties. The spinning slurry exhibited exceptional stability and spinnability. Decreasing the fiber diameter contributed to material densification and improved mechanical properties. Notably, when the fiber diameter is 0.9 mm, the fabricated Si<sub>3</sub>N<sub>4</sub>/BN fibrous monolithic ceramics demonstrate a carbon content of 0.82%, a three-point bending strength of 357 ± 24 MPa, and a fracture toughness of 8.8 ± 0.36 MPa·m<sup>1/2</sup>. This investigation offers valuable insights into producing high-performance Si<sub>3</sub>N<sub>4</sub>/BN composite ceramics utilizing hot-pressing technology. |
| first_indexed | 2024-03-10T22:30:51Z |
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| id | doaj.art-35f7d5d07fe44f73b94a5c67aef4c1be |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T22:30:51Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
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| spelling | doaj.art-35f7d5d07fe44f73b94a5c67aef4c1be2023-11-19T11:43:18ZengMDPI AGMaterials1996-19442023-09-011618613010.3390/ma16186130Advanced Fabrication Method and Mechanical Properties of Silicon Nitride/Boron Nitride Fibrous Monolithic CeramicsQingqing Chen0Yuan Zhang1Liuxin Chao2Ningning Dong3Yu Zhou4Guobing Ying5Department of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing 211100, ChinaDepartment of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing 211100, ChinaDepartment of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing 211100, ChinaDepartment of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing 211100, ChinaInstitute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaDepartment of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing 211100, ChinaSilicon nitride ceramics are regarded as a promising material for high-temperature structural applications due to their remarkable characteristics, including high strength, hardness, thermal conductivity, low dielectric properties, and resistance to creep at elevated temperatures. However, their susceptibility to catastrophic fracture at high temperatures remains a concern. Herein, Si<sub>3</sub>N<sub>4</sub>/BN fibrous monolithic ceramics have been successfully prepared by employing wet-spinning and hot-pressing techniques. We delved into the design and optimization of the spinning slurry and examined how the Si<sub>3</sub>N<sub>4</sub>/BN fiber diameter affects the ceramics’ microstructure and mechanical properties. The spinning slurry exhibited exceptional stability and spinnability. Decreasing the fiber diameter contributed to material densification and improved mechanical properties. Notably, when the fiber diameter is 0.9 mm, the fabricated Si<sub>3</sub>N<sub>4</sub>/BN fibrous monolithic ceramics demonstrate a carbon content of 0.82%, a three-point bending strength of 357 ± 24 MPa, and a fracture toughness of 8.8 ± 0.36 MPa·m<sup>1/2</sup>. This investigation offers valuable insights into producing high-performance Si<sub>3</sub>N<sub>4</sub>/BN composite ceramics utilizing hot-pressing technology.https://www.mdpi.com/1996-1944/16/18/6130Si<sub>3</sub>N<sub>4</sub>/BNfibrous monolithic ceramicmicrostructurefracture toughness |
| spellingShingle | Qingqing Chen Yuan Zhang Liuxin Chao Ningning Dong Yu Zhou Guobing Ying Advanced Fabrication Method and Mechanical Properties of Silicon Nitride/Boron Nitride Fibrous Monolithic Ceramics Materials Si<sub>3</sub>N<sub>4</sub>/BN fibrous monolithic ceramic microstructure fracture toughness |
| title | Advanced Fabrication Method and Mechanical Properties of Silicon Nitride/Boron Nitride Fibrous Monolithic Ceramics |
| title_full | Advanced Fabrication Method and Mechanical Properties of Silicon Nitride/Boron Nitride Fibrous Monolithic Ceramics |
| title_fullStr | Advanced Fabrication Method and Mechanical Properties of Silicon Nitride/Boron Nitride Fibrous Monolithic Ceramics |
| title_full_unstemmed | Advanced Fabrication Method and Mechanical Properties of Silicon Nitride/Boron Nitride Fibrous Monolithic Ceramics |
| title_short | Advanced Fabrication Method and Mechanical Properties of Silicon Nitride/Boron Nitride Fibrous Monolithic Ceramics |
| title_sort | advanced fabrication method and mechanical properties of silicon nitride boron nitride fibrous monolithic ceramics |
| topic | Si<sub>3</sub>N<sub>4</sub>/BN fibrous monolithic ceramic microstructure fracture toughness |
| url | https://www.mdpi.com/1996-1944/16/18/6130 |
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