Effect of Si Addition on Microstructure and Mechanical Properties of SiC Ceramic Fabricated by Direct LPBF with CVI Technology
In this paper, SiC and Si/SiC ceramics were fabricated using direct laser powder bed fusion with chemical vapor infiltration. Their microstructure, mechanical properties and the impacts of silicon addition were analyzed. The incorporation of silicon led to an increase in the relative density of the...
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2025-08-01
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| author | Yipu Wang Pei Wang Liqun Li Jian Zhang Yulei Zhang Jin Peng Xingxing Wang Nan Kang Mohamed El Mansori Konda Gokuldoss Prashanth |
| author_facet | Yipu Wang Pei Wang Liqun Li Jian Zhang Yulei Zhang Jin Peng Xingxing Wang Nan Kang Mohamed El Mansori Konda Gokuldoss Prashanth |
| author_sort | Yipu Wang |
| collection | DOAJ |
| description | In this paper, SiC and Si/SiC ceramics were fabricated using direct laser powder bed fusion with chemical vapor infiltration. Their microstructure, mechanical properties and the impacts of silicon addition were analyzed. The incorporation of silicon led to an increase in the relative density of the silicon carbide ceramics from 76.4% to 78.3% and the compression strength increased from 39 ± 13 MPa to 90 ± 8 MPa after laser powder bed fusion with chemical vapor infiltration. The melting and re-solidification of silicon allows the silicon to encapsulate the silicon carbide grains, changing the microstructure and the failure mechanism of the silicon carbide ceramics, resulting in a small amount of silicon residue. In the LPBF-CVI SiC ceramic specimen, the LPBF-formed SiC exhibits a microhardness of 24.2 ± 1.0 GPa. In LPBF-CVI Si/SiC, the spherical dual-phase structure displays a moderately increased hardness (25.9 ± 4.4 GPa), and the CVI-formed SiC exhibits a hardness of 55.3 ± 9.3 GPa. |
| format | Article |
| id | doaj-art-b51a1b1481404afab40595d73f442852 |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj-art-b51a1b1481404afab40595d73f4428522025-08-20T03:36:39ZengMDPI AGApplied Sciences2076-34172025-08-011515858510.3390/app15158585Effect of Si Addition on Microstructure and Mechanical Properties of SiC Ceramic Fabricated by Direct LPBF with CVI TechnologyYipu Wang0Pei Wang1Liqun Li2Jian Zhang3Yulei Zhang4Jin Peng5Xingxing Wang6Nan Kang7Mohamed El Mansori8Konda Gokuldoss Prashanth9State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, ChinaHenan Key Laboratory of High Performance Carbon Fiber Reinforced Composites, Institute of Carbon Matrix Composites, Henan Academy of Sciences, Zhengzhou 450046, ChinaState Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, ChinaCarbon/Carbon Composites Research Center, Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi’an 710072, ChinaHenan Key Laboratory of High Performance Carbon Fiber Reinforced Composites, Institute of Carbon Matrix Composites, Henan Academy of Sciences, Zhengzhou 450046, ChinaSchool of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaSchool of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaMechanics Surfaces and Materials Processing, Arts et Metiers Institute of Technology, F-51006 Châlons-En-Champagne, FranceMechanics Surfaces and Materials Processing, Arts et Metiers Institute of Technology, F-51006 Châlons-En-Champagne, FranceDepartment of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajete tee 5, 19086 Tallinn, EstoniaIn this paper, SiC and Si/SiC ceramics were fabricated using direct laser powder bed fusion with chemical vapor infiltration. Their microstructure, mechanical properties and the impacts of silicon addition were analyzed. The incorporation of silicon led to an increase in the relative density of the silicon carbide ceramics from 76.4% to 78.3% and the compression strength increased from 39 ± 13 MPa to 90 ± 8 MPa after laser powder bed fusion with chemical vapor infiltration. The melting and re-solidification of silicon allows the silicon to encapsulate the silicon carbide grains, changing the microstructure and the failure mechanism of the silicon carbide ceramics, resulting in a small amount of silicon residue. In the LPBF-CVI SiC ceramic specimen, the LPBF-formed SiC exhibits a microhardness of 24.2 ± 1.0 GPa. In LPBF-CVI Si/SiC, the spherical dual-phase structure displays a moderately increased hardness (25.9 ± 4.4 GPa), and the CVI-formed SiC exhibits a hardness of 55.3 ± 9.3 GPa.https://www.mdpi.com/2076-3417/15/15/8585silicon carbidelaser powder bed fusionchemical vapor infiltrationmicrostructuremechanical properties |
| spellingShingle | Yipu Wang Pei Wang Liqun Li Jian Zhang Yulei Zhang Jin Peng Xingxing Wang Nan Kang Mohamed El Mansori Konda Gokuldoss Prashanth Effect of Si Addition on Microstructure and Mechanical Properties of SiC Ceramic Fabricated by Direct LPBF with CVI Technology Applied Sciences silicon carbide laser powder bed fusion chemical vapor infiltration microstructure mechanical properties |
| title | Effect of Si Addition on Microstructure and Mechanical Properties of SiC Ceramic Fabricated by Direct LPBF with CVI Technology |
| title_full | Effect of Si Addition on Microstructure and Mechanical Properties of SiC Ceramic Fabricated by Direct LPBF with CVI Technology |
| title_fullStr | Effect of Si Addition on Microstructure and Mechanical Properties of SiC Ceramic Fabricated by Direct LPBF with CVI Technology |
| title_full_unstemmed | Effect of Si Addition on Microstructure and Mechanical Properties of SiC Ceramic Fabricated by Direct LPBF with CVI Technology |
| title_short | Effect of Si Addition on Microstructure and Mechanical Properties of SiC Ceramic Fabricated by Direct LPBF with CVI Technology |
| title_sort | effect of si addition on microstructure and mechanical properties of sic ceramic fabricated by direct lpbf with cvi technology |
| topic | silicon carbide laser powder bed fusion chemical vapor infiltration microstructure mechanical properties |
| url | https://www.mdpi.com/2076-3417/15/15/8585 |
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