Intelligent cooling structure design of "Z-pins like" silicon rods to enhance the ablation resistance of C/C-ZrC-SiC composites above 2500 °C. Issue 12 (September 2020)

• Record Type: Journal Article
• Authors: Tian, Tian; Sun, Wei; Qing, Xin; Xiong, Xiang; Zhang, Hongbo; Chu, Yuhao; Chen, Zhaoke; Zeng, Yi
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 12(2020)
• Page Start: 3875
• Page End: 3886
• Publication Date: 2020-09
• Subjects: Ablation resistance -- C/C-ZrC-SiC composites -- Z-pins like silicon rods -- Dissipative agent -- Dissipative thermal protection mechanism; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.05.016
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: In order to improve the ablation resistance of C/C-ZrC-SiC composites by reducing the damage of the protective oxide layer, novel "Z-pins like" silicon rods, which were designed and fabricated by liquid phase sintering, were utilised as a dissipative agent. The microstructure evolution and thermal dissipation behaviour were investigated after ablating above 2500 °C for 300 s. After the "Z-pins like" silicon rods were implanted, the anti-ablative property of the C/C-ZrC-SiC composites was drastically improved by the dissipative thermal protection mechanism. The linear ablation rate of the "Z-pins like" silicon rod-reinforced C/C-ZrC-SiC composite was -0.28 μm/s, which is 112.72% lower than the unmodified composite. Additionally, the actual ablative temperature dropped approximately 357 °C, which enabled abundant SiO2 to remain in the ablation centre. Furthermore, a dense SiO2 -rich oxide layer with a low oxygen diffusion coefficient is formed that covers the entire ablative surface.