Multi-synergy ablative effects of laminated SiO2-graphite/SiO2/Cu composite irradiated by high power laser
Multi-synergy ablative effects of laminated SiO2-graphite/SiO2/Cu composite irradiated by high power laser
复制标题
高功率激光辐照层状SiO2-石墨/SiO2/Cu复合材料的多重协同烧蚀效应
DOI：
10.1016/j.ceramint.2019.05.017
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Li Hezhang
中科院分区：
文献类型：
--
作者：
Li Wenzhi;Gao Lihong;Ma Zhuang;Wang Fuchi;Wu Taotao;Wang Lijun;Li Hezhang
面对超高温烧蚀问题的挑战，多方协同高效的消能方法是一种可行的解决方案。采用热压法制备了具有多层铜层的结构改性二氧化硅-石墨复合材料。分析了其烧蚀行为和机理。在激光烧蚀过程中，所设计的复合材料表现出优异的耐烧蚀性，并具有多方面的协同效应。随着烧蚀时间的增加，烧蚀机理由反射和水平热扩散转变为反应和水平热扩散以及垂直绝热。此外，由反应体积收缩产生的差距可进一步隔绝垂直方向上的热传递。可以进一步降低背表面温度的增加速率。这种多协同效应策略和设计的结构配合合适的材料可以大大提高复合材料的抗烧蚀能力。
Faced with the challenge of ultra–high–temperature ablation problems, multi-synergy and efficient energy dissipation method is a feasible solution. A structure-modified silica-graphite composite with multiple copper layers was prepared by hot-pressing. The ablation behaviors and mechanisms were analyzed in detail. During the laser ablation, the designed composite exhibits excellent ablation resistance with a multi-synergy effects strategy. As ablation time increases, the ablation mechanisms change from reflection and horizontal thermal diffusion to reaction and horizontal thermal diffusion and vertical heat insulation. Moreover, the gap generated by the reaction volume contraction can further insulate against heat transfer in the vertical direction. The rate of increase of back-surface temperature can be further reduced. This multi-synergy effects strategy and designed structure accompanied with appropriate materials can greatly enhance the ablation resistance ability of the composite.