Effect of multi-walled carbon nanotubes on thermal stability and ablation properties of EPDM insulation materials for solid rocket motors
Effect of multi-walled carbon nanotubes on thermal stability and ablation properties of EPDM insulation materials for solid rocket motors
复制标题
多壁碳纳米管对固体火箭发动机EPDM绝缘材料热稳定性和烧蚀性能的影响
DOI：
10.1016/j.actaastro.2019.01.047
复制
发表时间：
2019-06-01
影响因子：
3.5
通讯作者：
Ji, Jianbo
中科院分区：
文献类型：
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作者：
Guo, Mengfei;Li, Jiang;Ji, Jianbo
多壁碳纳米管(MWCNTs)具有优异的物理化学性能，可以作为填料来改善绝缘材料的性能。然而，目前对多壁碳纳米管改善绝缘材料烧蚀性能的机理还没有很好的了解。在这里，我们制备了含有和不含有碳纳米管的两种配方的三元乙丙橡胶绝缘材料，通过热重分析、高温残炭层实验、氧乙炔烧蚀实验等分析方法，结合扫描电子显微镜和能谱分析，研究了其热稳定性和烧蚀特性。从炭层形成、炭层消耗和微观形貌三个方面揭示了碳纳米管改善绝缘材料烧蚀性能的内在机理。MWCNTs的加入增加了热分解后的残碳率，并能抑制高温条件下炭层的消耗反应。微观形态分析表明，含有多壁碳纳米管的绝热材料表面炭层致密，内部呈网状结构，提高了炭层抵抗气流侵蚀的能力。这些因素的综合作用，提高了三元乙丙橡胶的烧蚀性能。我们关于MWCNT增强机理的研究结果可以指导新型绝缘材料的设计。
Multi-walled carbon nanotubes (MWCNTs) have excellent physicochemical properties and can be used as fillers to improve the performance of insulation materials. However, there is currently no proper understanding of the mechanism by which MWCNTs improve the ablation performance of insulation materials. Here, we prepare two formulations of ethylene propylene diene monomer (EPDM) insulation materials with and without MWCNTs and study their thermal stability and ablation characteristics via thermogravimetric analysis, high temperature char layer residue experiments, oxyacetylene ablation tests, and other analytical methods along with scanning electron microscopy and energy dispersive X-ray spectroscopy. The intrinsic mechanism by which MWCNTs improve the ablation performance of insulation materials is revealed from the perspectives of char layer formation, consumption, and micro-morphology. The addition of MWCNTs increased the carbon residue rate after thermal decomposition and can suppress the consumption reaction of the char layer under high-temperature conditions. Microscopic morphological analyses show that the insulation material containing MWCNTs has a denser char layer surface and a network-like structure inside, which improve the ability of the char layer to resist erosion by gas flow. The combination of these factors improves the ablation performance of EPDM. Our findings regarding the MWCNT reinforcement mechanism can guide the design of new insulation materials.