Effect of CVD-SiC array structure on ablation resistance of ZrB2/SiC coatings

被引：0
|
作者：
Gao Z. [1 ,2 ]
Ma Z. [1 ,2 ]
Liu Y. [1 ,2 ]
机构：
[1] School of Materials Science and Engineering, Beijing Institute of Technology, Beijing
[2] Chongqing Innovation Center, Beijing Institute of Technology, Chongqing
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2024年 / 45卷 / 03期
关键词：
ablation; array structure; C/C composite materials; CVD-SiC; laser etching; plasma spraying;
D O I：
10.7527/S1000-6893.2023.28842
中图分类号：
学科分类号：
摘要：
Influence of array structure on the performance of ZrB2/SiC coatings was studied by using femtosecond laser to prepare arrays with different sizes on the surface of the Chemical Vapor Deposition（CVD）-SiC interlayer. Results showed that with the increase of laser etching frequency，the depth of the array structure increased from 30 μm to 150 μm. After 600 s of oxyacetylene combustion，the surface temperature of the ZrB2/SiC coating decreased gradually with the increase of CVD-SiC microstructure depth，and the lowest surface temperature reached 1 700 ℃，which decreased by nearly 200 ℃ . The color of the combustion center area transitioned from white to light gray. For the samples with an etching frequency of 5 times，after a single cycle of 600 s，the mass combustion rate and linear combustion rate were -7. 4 × 10-5 g/s and -13. 3 μm/s respectively. The array structure increased the contact area between the ZrB2/SiC coating and the CVD-SiC interlayer，thereby increasing the thermal conductivity，reducing heat accumulation，and ultimately enhancing the anti-combustion performance of the ZrB2/SiC coating. © 2024 Chinese Society of Astronautics. All rights reserved.
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