Microstructure and ablation behavior of SiMo/graphite composites with excellent short-time ablation resistance. (15th May 2020)

• Record Type: Journal Article
• Authors: Kang, Pengchao; Liu, Hao; Yang, Wenshu; Wang, Wei; Zhang, Ningbo; Zhao, Qiqi; Mula, Suhrit; Wu, Gaohui
• Is Part Of: Corrosion science. Volume 168(2020)
• Publication Date: 2020-05-15
• Subjects: A. Ceramic matrix composites -- B. SEM -- B. Oxy-acetylene flame -- C. High temperature corrosion -- C. Oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.108590
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: SiMo/graphite composite was prepared by porous graphite infiltrated with SiMo alloy. The SiMo/graphite composites showed low-ablative characteristic after ablating 60 s. The melt and evaporation of Si reduced temperature and supplied SiO2 layer. SiO2 -MoSi2 layer acted as a barrier between the flame and the ablation surface. Abstract: Si-Mo alloy was infiltrated into porous graphite to develop a short-term low-ablative SiMo/graphite composite material. 19.4 vol.% residual Si was retained in the composites and significantly improved the short-term (less than 60 s) ablation resistance without sacrificing long-term (∼180 s) ablation resistance. The excellent short-term low-ablative performance is ascribed to the melt and evaporation of Si, which reduces the rate of temperature rise and supplies the consumption of SiO2 in the ablation surface. With the progress of ablation time, the ablation surface forms a SiO2 -MoSi2 double layer, which acts as a barrier between the oxyacetylene flame and the ablation surface.