Ablation Mechanism of AlSiB-C/C Composites under an Oxy-Acetylene Torch
In order to improve the ablation resistance of C/C composites, an AlSiB alloy (mass ratio of Al/Si/B = 2:4:1) was used as a dissipative agent to fill the pores of a C/C composites matrix by reactive melt infiltration to prepare AlSiB-C/C composites. The microstructure evolution and ablation behavior...
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MDPI AG
2023-01-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/1/160 |
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| author | Qiuchen Han Lei Chang Zhaoqun Sun Jiaqi Sun Zengyan Wei Pingping Wang Ziyang Xiu Huasong Gou Pengchao Kang Gaohui Wu |
| author_facet | Qiuchen Han Lei Chang Zhaoqun Sun Jiaqi Sun Zengyan Wei Pingping Wang Ziyang Xiu Huasong Gou Pengchao Kang Gaohui Wu |
| author_sort | Qiuchen Han |
| collection | DOAJ |
| description | In order to improve the ablation resistance of C/C composites, an AlSiB alloy (mass ratio of Al/Si/B = 2:4:1) was used as a dissipative agent to fill the pores of a C/C composites matrix by reactive melt infiltration to prepare AlSiB-C/C composites. The microstructure evolution and ablation behavior of the obtained AlSiB-C/C composites (mass ratio of Al/Si/B = 2:4:1) under oxy-acetylene flame were investigated by SEM after ablating for 25 s, 50 s, 100 s and 150 s. At the beginning of the ablation process, thermal chemical erosion played a leading part. By using the heat-absorption effect of sweating and the sealing protection effect of the oxide layer, AlSiB-C/C composites significantly reduced the ablation surface temperature, and the linear ablation rate was 4.04 μm/s. With the process of ablation, thermal mechanical erosion tended to dominate. The specimen surface could not form a continuous covering of oxide film to slow down the flame scour, resulting in non-uniform ablation and further expansion of the ablation pit. The self-transpiration cooling behavior and the self-sealing of the ablation products of the dissipative agent played an important role in reducing the extent of thermal chemical erosion and preventing matrix ablation. |
| first_indexed | 2024-03-09T11:41:51Z |
| format | Article |
| id | doaj.art-d08125814ae34c3cb322f38a5e338cfd |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T11:41:51Z |
| publishDate | 2023-01-01 |
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| series | Metals |
| spelling | doaj.art-d08125814ae34c3cb322f38a5e338cfd2023-11-30T23:31:33ZengMDPI AGMetals2075-47012023-01-0113116010.3390/met13010160Ablation Mechanism of AlSiB-C/C Composites under an Oxy-Acetylene TorchQiuchen Han0Lei Chang1Zhaoqun Sun2Jiaqi Sun3Zengyan Wei4Pingping Wang5Ziyang Xiu6Huasong Gou7Pengchao Kang8Gaohui Wu9School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaLaboratory No. 8, Institute of Electronic System Engineering, Beijing 100854, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaIn order to improve the ablation resistance of C/C composites, an AlSiB alloy (mass ratio of Al/Si/B = 2:4:1) was used as a dissipative agent to fill the pores of a C/C composites matrix by reactive melt infiltration to prepare AlSiB-C/C composites. The microstructure evolution and ablation behavior of the obtained AlSiB-C/C composites (mass ratio of Al/Si/B = 2:4:1) under oxy-acetylene flame were investigated by SEM after ablating for 25 s, 50 s, 100 s and 150 s. At the beginning of the ablation process, thermal chemical erosion played a leading part. By using the heat-absorption effect of sweating and the sealing protection effect of the oxide layer, AlSiB-C/C composites significantly reduced the ablation surface temperature, and the linear ablation rate was 4.04 μm/s. With the process of ablation, thermal mechanical erosion tended to dominate. The specimen surface could not form a continuous covering of oxide film to slow down the flame scour, resulting in non-uniform ablation and further expansion of the ablation pit. The self-transpiration cooling behavior and the self-sealing of the ablation products of the dissipative agent played an important role in reducing the extent of thermal chemical erosion and preventing matrix ablation.https://www.mdpi.com/2075-4701/13/1/160reactive melt infiltrationablation resistanceAlSiB-C/C compositesoxy-acetylene flameheat dissipation |
| spellingShingle | Qiuchen Han Lei Chang Zhaoqun Sun Jiaqi Sun Zengyan Wei Pingping Wang Ziyang Xiu Huasong Gou Pengchao Kang Gaohui Wu Ablation Mechanism of AlSiB-C/C Composites under an Oxy-Acetylene Torch Metals reactive melt infiltration ablation resistance AlSiB-C/C composites oxy-acetylene flame heat dissipation |
| title | Ablation Mechanism of AlSiB-C/C Composites under an Oxy-Acetylene Torch |
| title_full | Ablation Mechanism of AlSiB-C/C Composites under an Oxy-Acetylene Torch |
| title_fullStr | Ablation Mechanism of AlSiB-C/C Composites under an Oxy-Acetylene Torch |
| title_full_unstemmed | Ablation Mechanism of AlSiB-C/C Composites under an Oxy-Acetylene Torch |
| title_short | Ablation Mechanism of AlSiB-C/C Composites under an Oxy-Acetylene Torch |
| title_sort | ablation mechanism of alsib c c composites under an oxy acetylene torch |
| topic | reactive melt infiltration ablation resistance AlSiB-C/C composites oxy-acetylene flame heat dissipation |
| url | https://www.mdpi.com/2075-4701/13/1/160 |
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