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- Title
Ablation Mechanism of AlSiB-C/C Composites under an Oxy-Acetylene Torch.
- Authors
Han, Qiuchen; Chang, Lei; Sun, Zhaoqun; Sun, Jiaqi; Wei, Zengyan; Wang, Pingping; Xiu, Ziyang; Gou, Huasong; Kang, Pengchao; Wu, Gaohui
- Abstract
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.
- Subjects
MELT infiltration; OXIDE coating; SURFACE temperature; FLAME; TORCHES
- Publication
Metals (2075-4701), 2023, Vol 13, Issue 1, p160
- ISSN
2075-4701
- Publication type
Article
- DOI
10.3390/met13010160