Preparation and properties of C/SiC composites reinforced by high thermal conductivity graphite films

• Published in: Diamond and related materials 2021-06, Vol.116, p.108376, Article 108376
• Main Authors: Zhao, Jiajia, Cai, Rong, Ma, Zhaokun, Zhang, Kaixuan, Liang, Hengliang, Qiu, Haipeng, Liu, Shanhua, Xie, Weijie
• Format: Article
• Language: English
• Subjects: Ablation; Ablation resistance; Carbon fibers; Ceramic matrix composites; Cloth; Composites; Graphite; Heat conductivity; Heat transfer; High thermal conductivity graphite films; Mechanical properties; Pyrolysis; Resistance factors; Service life; Silicon carbide (SiC); Thermal conductivity
• ISSN: 0925-9635; 1879-0062
• DOI: 10.1016/j.diamond.2021.108376

Ablation resistance as an important factor affecting the service life of SiC ceramic matrix composites that is highly valued. In this study, Three C/SiC composites reinforced by high thermal conductivity (HTC) graphite films and carbon fiber cloth were fabricated by precursor infiltration and pyrolysis (PIP) technology, to improve the ablation resistance of C/SiC composites. The quantity ratios of carbon fiber cloth to HTC graphite film was 1:0, 1:1, and 1:10. The microstructure, mechanical properties, thermal conductivity and ablation performance of C/SiC composites after plasma ablation test at 1500 °C for 600 s were investigated. The results indicated that with the increase of graphite films' contents, the in-plane thermal conductivity of composites was increased from 9.78 W/(m·K) to 333.34 W/(m·K). Meantime, the mass loss rate reduced from 1.18 to 0.74 mg/s and the linear ablation rate reduced from 0.64 to 0.18 mm/s, revealing that the addition of graphite films could effectively improve the ablation resistance of C/SiC composites. [Display omitted] •For the first time, high thermal conductivity (HTC) graphite film is applied to C/SiC composite material.•The plasma ablation test of C/SiC composite material was carried out at 1500 °C for 600 s.•The thermal conductivity of composites was increased from 9.78 W/(m·K) to 333.34 W/(m·K).•The mass loss rate reduced from 1.18 to 0.74 mg/s