Enhanced mechanical properties of nanocrystalline B4C–SiC composites by in-situ high pressure reactive sintering
A unique optimized of core–shell structural B4C nanopowder, sintering aid additive of Si, and high-pressure sintering technique has been used to process nanocrystalline B4C–SiC ceramics with enhanced mechanical properties. C-coated B4C nanopowder was initially uniformly mixed with micron Si of diffe...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423025590 |
| _version_ | 1797301547807277056 |
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| author | Mengdong Ma Rongxin Sun Lei Sun Yingju Wu Pan Ying Yanhui Chu Zhisheng Zhao Zhenhui Kang Julong He |
| author_facet | Mengdong Ma Rongxin Sun Lei Sun Yingju Wu Pan Ying Yanhui Chu Zhisheng Zhao Zhenhui Kang Julong He |
| author_sort | Mengdong Ma |
| collection | DOAJ |
| description | A unique optimized of core–shell structural B4C nanopowder, sintering aid additive of Si, and high-pressure sintering technique has been used to process nanocrystalline B4C–SiC ceramics with enhanced mechanical properties. C-coated B4C nanopowder was initially uniformly mixed with micron Si of different content by ball-milling. B4C–SiC composites with a homogenous distribution of SiC in B4C matrix were subsequently obtained by sintering the mixed powders at 6 GPa and 1600 °C. The added Si reacted with submicron amorphous carbon layer and amorphous carbon nanoshell to form dispersed SiC nanocrystals and Si–C phase filled at B4C grain boundaries and pores, respectively. The prepared composite had the most outstanding mechanical properties when the Si content in the precursor was 15 wt%, with a hardness reaching 37.8 GPa and a fracture toughness reaching 7.3 MPa·m1/2. Microstructural characterizations indicated that the multi deflection of nanoscale crack caused by intergranular fracture, the covalent bonding of Si–C phase at the grain boundary, and the abundant nanotwin substructure were jointly responsible for the superior performance in hardness and fracture toughness. |
| first_indexed | 2024-03-07T23:24:09Z |
| format | Article |
| id | doaj.art-c466bb0e5a2b416893e6e0e738816ddb |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-07T23:24:09Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-c466bb0e5a2b416893e6e0e738816ddb2024-02-21T05:26:19ZengElsevierJournal of Materials Research and Technology2238-78542023-11-012727902796Enhanced mechanical properties of nanocrystalline B4C–SiC composites by in-situ high pressure reactive sinteringMengdong Ma0Rongxin Sun1Lei Sun2Yingju Wu3Pan Ying4Yanhui Chu5Zhisheng Zhao6Zhenhui Kang7Julong He8Macao Institute of Materials Science and Engineering (MIMSE), Macau University of Science and Technology, Taipa 999078, Macau SAR, China; Center for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China; Corresponding author. Macao Institute of Materials Science and Engineering (MIMSE), Macau University of Science and Technology, Taipa 999078, Macau SAR, China.Center for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, ChinaCenter for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, ChinaCenter for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, ChinaCenter for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, ChinaSchool of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, ChinaCenter for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, ChinaMacao Institute of Materials Science and Engineering (MIMSE), Macau University of Science and Technology, Taipa 999078, Macau SAR, China; Corresponding author.Center for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China; Corresponding author.A unique optimized of core–shell structural B4C nanopowder, sintering aid additive of Si, and high-pressure sintering technique has been used to process nanocrystalline B4C–SiC ceramics with enhanced mechanical properties. C-coated B4C nanopowder was initially uniformly mixed with micron Si of different content by ball-milling. B4C–SiC composites with a homogenous distribution of SiC in B4C matrix were subsequently obtained by sintering the mixed powders at 6 GPa and 1600 °C. The added Si reacted with submicron amorphous carbon layer and amorphous carbon nanoshell to form dispersed SiC nanocrystals and Si–C phase filled at B4C grain boundaries and pores, respectively. The prepared composite had the most outstanding mechanical properties when the Si content in the precursor was 15 wt%, with a hardness reaching 37.8 GPa and a fracture toughness reaching 7.3 MPa·m1/2. Microstructural characterizations indicated that the multi deflection of nanoscale crack caused by intergranular fracture, the covalent bonding of Si–C phase at the grain boundary, and the abundant nanotwin substructure were jointly responsible for the superior performance in hardness and fracture toughness.http://www.sciencedirect.com/science/article/pii/S2238785423025590Boron carbideHigh-pressure sinteringHardnessToughening |
| spellingShingle | Mengdong Ma Rongxin Sun Lei Sun Yingju Wu Pan Ying Yanhui Chu Zhisheng Zhao Zhenhui Kang Julong He Enhanced mechanical properties of nanocrystalline B4C–SiC composites by in-situ high pressure reactive sintering Journal of Materials Research and Technology Boron carbide High-pressure sintering Hardness Toughening |
| title | Enhanced mechanical properties of nanocrystalline B4C–SiC composites by in-situ high pressure reactive sintering |
| title_full | Enhanced mechanical properties of nanocrystalline B4C–SiC composites by in-situ high pressure reactive sintering |
| title_fullStr | Enhanced mechanical properties of nanocrystalline B4C–SiC composites by in-situ high pressure reactive sintering |
| title_full_unstemmed | Enhanced mechanical properties of nanocrystalline B4C–SiC composites by in-situ high pressure reactive sintering |
| title_short | Enhanced mechanical properties of nanocrystalline B4C–SiC composites by in-situ high pressure reactive sintering |
| title_sort | enhanced mechanical properties of nanocrystalline b4c sic composites by in situ high pressure reactive sintering |
| topic | Boron carbide High-pressure sintering Hardness Toughening |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423025590 |
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