Ablation behavior and mechanism of 3D C/ZrC composite in oxyacetylene torch environment

Ablation behavior and mechanism of 3D C/ZrC composite in oxyacetylene torch environment
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氧乙炔炬环境下3D C/ZrC复合材料的烧蚀行为及机理

DOI:
10.1016/j.compscitech.2011.05.005
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发表时间:
2011-07
影响因子:
9.1
通讯作者:
Zhao, Dan
Zhao, Dan
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhang, Changrui;Zhang, Yudi;Hu, Haifeng;Zhao, Dan

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采用氧乙炔焰炬烧蚀试验,在热流密度为4187 kW/m2,火焰温度超过3000°C的条件下,对三维碳纤维增强碳化锆复合材料(3DC/ZrC复合材料)的烧蚀性能进行了研究。C/ZrC复合材料在60- 300 s内的表面温度超过2000°C,具有良好的结构稳定性,而3DC/SiC复合材料在55 s内就被穿孔。烧蚀300 s后,复合材料的质量损失率为0.006g/s,线性衰退率为0.004mm/s。C/ZrC复合材料烧蚀性能的提高主要是由于表面氧化锆熔体的形成。烧蚀后的C/ZrC复合材料由于温度和压力梯度的影响呈现出四层结构:熔化层、疏松的树珊瑚状ZrO 2层、表面下氧化层和复合层。
Ablation property of three dimensional carbon fiber reinforced zirconium carbide composite (3D C/ZrC composite) was determined using oxyacetylene torch test with a heat flux of 4187kW/m2and flame temperature of over 3000°C. C/ZrC composite exhibited an excellent configurational stability with a surface temperature of over 2000°C during 60–300s period, while 3D C/SiC composite was perforated at 55s. After ablation for 300s, the composite showed a mass loss rate of 0.006g/s and a linear recession rate of 0.004mm/s. The formation of zirconia melt on the surface of the C/ZrC composite contributed mainly the ablation property improvement. The C/ZrC composite after ablation showed four different layers due to the temperature and pressure gradients: the melting layer, the loose tree-coral-like ZrO2layer, the undersurface oxidation layer, and the composite layer.
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