Improvement of Mechanical Properties of Composites with Surface Modified B<sub>4</sub>C for Precision Machining
In order to solve the problem of difficult sintering and high brittleness of B<sub>4</sub>C-based ceramics, B<sub>4</sub>C@ZrB<sub>2</sub>-TiB<sub>2</sub> composite powder was synthesized by molten salt method, and B<sub>4</sub>C–(Zr, Ti)B&...
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MDPI AG
2023-01-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/2/882 |
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| author | Jun Ding Jintao Wang Hao Yang Zhenglong Liu Chao Yu Xiangcheng Li Chengji Deng Hongxi Zhu |
| author_facet | Jun Ding Jintao Wang Hao Yang Zhenglong Liu Chao Yu Xiangcheng Li Chengji Deng Hongxi Zhu |
| author_sort | Jun Ding |
| collection | DOAJ |
| description | In order to solve the problem of difficult sintering and high brittleness of B<sub>4</sub>C-based ceramics, B<sub>4</sub>C@ZrB<sub>2</sub>-TiB<sub>2</sub> composite powder was synthesized by molten salt method, and B<sub>4</sub>C–(Zr, Ti)B<sub>2</sub> composite ceramics were successfully prepared by spark plasma sintering. The effects of different raw material ratios on the composition, microstructure, and mechanical properties of the prepared composite ceramics were characterized by XRD, XPS, SEM, and TEM. The results show that ZrB<sub>2</sub> and TiB<sub>2</sub> were grown on the surface of B<sub>4</sub>C by template mechanism to form a dense nanocrystalline coating, and the original surface of B<sub>4</sub>C was exposed gradually with the decrease of the ratio of metal powder. When the composite powders were sintered at 1700 °C, ZrB<sub>2</sub> and TiB<sub>2</sub> formed a solid solution, which can refine grains and improve strength. When the raw material ratio is n(B<sub>4</sub>C): n(Zr): n(Ti) = 12:1:1, the composite ceramics have excellent comprehensive properties, the Vickers hardness reaches 41.2 GPa. |
| first_indexed | 2024-03-09T11:47:28Z |
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| id | doaj.art-5f05f170c3da43f3a744d9a4241cb7cc |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:47:28Z |
| publishDate | 2023-01-01 |
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| series | Materials |
| spelling | doaj.art-5f05f170c3da43f3a744d9a4241cb7cc2023-11-30T23:19:33ZengMDPI AGMaterials1996-19442023-01-0116288210.3390/ma16020882Improvement of Mechanical Properties of Composites with Surface Modified B<sub>4</sub>C for Precision MachiningJun Ding0Jintao Wang1Hao Yang2Zhenglong Liu3Chao Yu4Xiangcheng Li5Chengji Deng6Hongxi Zhu7The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaThe State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaThe State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaThe State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaThe State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaThe State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaThe State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaThe State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, ChinaIn order to solve the problem of difficult sintering and high brittleness of B<sub>4</sub>C-based ceramics, B<sub>4</sub>C@ZrB<sub>2</sub>-TiB<sub>2</sub> composite powder was synthesized by molten salt method, and B<sub>4</sub>C–(Zr, Ti)B<sub>2</sub> composite ceramics were successfully prepared by spark plasma sintering. The effects of different raw material ratios on the composition, microstructure, and mechanical properties of the prepared composite ceramics were characterized by XRD, XPS, SEM, and TEM. The results show that ZrB<sub>2</sub> and TiB<sub>2</sub> were grown on the surface of B<sub>4</sub>C by template mechanism to form a dense nanocrystalline coating, and the original surface of B<sub>4</sub>C was exposed gradually with the decrease of the ratio of metal powder. When the composite powders were sintered at 1700 °C, ZrB<sub>2</sub> and TiB<sub>2</sub> formed a solid solution, which can refine grains and improve strength. When the raw material ratio is n(B<sub>4</sub>C): n(Zr): n(Ti) = 12:1:1, the composite ceramics have excellent comprehensive properties, the Vickers hardness reaches 41.2 GPa.https://www.mdpi.com/1996-1944/16/2/882molten salt methodNano (Zr, Ti)B<sub>2</sub>coatingB<sub>4</sub>C–(Zr, Ti)B<sub>2</sub> composite ceramics |
| spellingShingle | Jun Ding Jintao Wang Hao Yang Zhenglong Liu Chao Yu Xiangcheng Li Chengji Deng Hongxi Zhu Improvement of Mechanical Properties of Composites with Surface Modified B<sub>4</sub>C for Precision Machining Materials molten salt method Nano (Zr, Ti)B<sub>2</sub> coating B<sub>4</sub>C–(Zr, Ti)B<sub>2</sub> composite ceramics |
| title | Improvement of Mechanical Properties of Composites with Surface Modified B<sub>4</sub>C for Precision Machining |
| title_full | Improvement of Mechanical Properties of Composites with Surface Modified B<sub>4</sub>C for Precision Machining |
| title_fullStr | Improvement of Mechanical Properties of Composites with Surface Modified B<sub>4</sub>C for Precision Machining |
| title_full_unstemmed | Improvement of Mechanical Properties of Composites with Surface Modified B<sub>4</sub>C for Precision Machining |
| title_short | Improvement of Mechanical Properties of Composites with Surface Modified B<sub>4</sub>C for Precision Machining |
| title_sort | improvement of mechanical properties of composites with surface modified b sub 4 sub c for precision machining |
| topic | molten salt method Nano (Zr, Ti)B<sub>2</sub> coating B<sub>4</sub>C–(Zr, Ti)B<sub>2</sub> composite ceramics |
| url | https://www.mdpi.com/1996-1944/16/2/882 |
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