Microstructure and ablation behaviour of a Cf/SiC-Al composite prepared by infiltrating Al alloy into Cf/SiC

•Al alloy was successfully introduced into the porous Cf/SiC performs.•The Cf/SiC-Al composite showed a better anti-ablation property than Cf/SiC composites.•Transpiration cooling mechanism of Cf/SiC-Al composites investigated.•The self-healing mechanism of the Cf/SiC-Al composite was discussed.•The...

Full description

Saved in:
Bibliographic Details
Published in:Journal of alloys and compounds 2022-02, Vol.895, p.162430, Article 162430
Main Authors: Jia, Jinhao, Bai, Shuxin, Xiong, Degan, Chen, Qiang, Li, Cong, Gao, Minqi
Format: Article
Language:English
Subjects:
Ablation
Ablation mechanism
Ablation properties
Aluminum base alloys
Bend strength
Cf/SiC-Al composites
Composite materials
Mechanical properties
Microstructure
Sealing
Sweat cooling
Transpiration
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Al alloy was successfully introduced into the porous Cf/SiC performs.•The Cf/SiC-Al composite showed a better anti-ablation property than Cf/SiC composites.•Transpiration cooling mechanism of Cf/SiC-Al composites investigated.•The self-healing mechanism of the Cf/SiC-Al composite was discussed.•The Cf/SiC-Al composites can significantly reduced the ablation surface temperature. To utilise the heat-absorption effect of sweating and sealing protection effect of the oxide layer, Al alloy was introduced into porous Cf/SiC composite using pressure-infiltration method. Microstructure, compositions, mechanical properties of the infiltrated composites were studied. The ablation properties, ablation surface morphology evolution and ablation mechanism of the Cf/SiC-Al composites were investigated for the first time. Results show that the bending strength of Cf/SiC-Al reached 349.8 MPa, which was 58.5% higher than the 220.7 MPa of Cf/SiC composite. Compared with Cf/SiC composites, linear ablation rates of Cf/SiC-Al composites decrease nearly by two orders of magnitude. It was also found that the transpiration cooling of the aluminum alloy in the composite was prior to the mechanical denudation of the Cf/SiC composite. The excellent anti-ablative properties were also attributed to self-sealing protection of ablation products, which played important roles in reducing the degree of thermochemical ablation and preventing matrix ablation.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.162430