Boron based fillers as char enhancers of EPDM based heat shielding materials for SRMs: A comparative analysis

Rallini Marco; Puri Ivan; Torre Luigi; Natali Maurizio

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Boron based fillers as char enhancers of EPDM based heat shielding materials for SRMs: A comparative analysis

机译：硼基填料作为用于SRM的EPDM基隔热材料的炭增强剂：对比分析

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摘要

Solid Rocket Motors (SRMs) are used to launch satellites and other civilian or military payloads in orbit. Due to their low density and outstanding insulation capability, EPDM/aramid fibers ablatives represent the state of the art of Elastomeric Heat Shielding Materials (EHSMs) SRMs. However, this class of polymeric ablatives tend to exhibit a limited ablation resistance induced by thermo-oxidation and mechanical erosion due to the propellant combustion byproducts. In order to increase the thermo-oxidation resistance, char retention, and insulation index, boron based fillers can be considered in the material formulation of the SRM insulation liner. In this work we systematically studied the effect of different boron containing fillers embedded in EPDM based EHSMs. The heat capacity, thermal stability, mechanical properties, ablation resistance, pre- and post-oxy-acetylene torch testing morphology of these materials were analyzed evidencing the clear benefits of these fillers.

机译：固体火箭发动机（SRM）用于在轨道上发射卫星和其他民用或军用有效载荷。由于其低密度和出色的绝缘能力，EPDM /芳族聚酰胺纤维烧蚀剂代表了弹性热屏蔽材料（EHSMs）SRM的最新技术水平。然而，由于推进剂燃烧副产物，这类聚合消融剂倾向于表现出由热氧化和机械腐蚀引起的有限的抗烧蚀性。为了提高抗热氧化性，保持焦炭和绝缘指数，可以在SRM绝缘衬里的材料配方中考虑硼基填料。在这项工作中，我们系统地研究了嵌入在基于EPDM的EHSM中的不同含硼填料的作用。分析了这些材料的热容量，热稳定性，机械性能，耐烧蚀性，氧-乙炔焊前后的火焰测试形态，证明了这些填料的明显优势。

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来源
《Composite Structures》 |2018年第8期|73-83|共11页
作者
Rallini Marco; Puri Ivan; Torre Luigi; Natali Maurizio;
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作者单位

Univ Perugia, Civil & Environm Engn, Str Pentima 4, I-05100 Terni, Italy;

Univ Perugia, Civil & Environm Engn, Str Pentima 4, I-05100 Terni, Italy;

Univ Perugia, Civil & Environm Engn, Str Pentima 4, I-05100 Terni, Italy;

Univ Perugia, Civil & Environm Engn, Str Pentima 4, I-05100 Terni, Italy;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Ablative materials; Solid Rocket Motors; EPDM rubber; Boron based fillers;

机译：烧蚀材料;固体火箭发动机;EPDM橡胶;硼基填料;

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专利

1. EPDM based beat shielding materials for Solid Rocket Motors: A comparative study of different fibrous reinforcements [J] . Maurizio Natali, Marco Rallini, Debora Puglia, Polymer Degradation and Stability . 2013,第11期

机译：基于EPDM的固体火箭发动机防震罩材料：不同纤维增强材料的比较研究
2. EPDM-based heat-shielding materials modified by hybrid elastomers of silicone or polyphosphazene [J] . Wu Shaojun, Zhang Shuangkun, Akram Raheel, High performance polymers . 2019,第9a10期

机译：基于EPDM的含有硅氧烷或多磷腈的杂种弹性体改性的热屏蔽材料
3. Ablation modeling of state of the art EPDM based elastomeric heat shielding materials for solid rocket motors [J] . Natali Maurizio, Puri Ivan, Rallini Marco, Computational Materials Science . 2016,第Null期

机译：用于固体火箭发动机的基于EPDM的最新技术的烧蚀建模
4. EPDM matrix heat shielding materials based on boron containing fillers as char promoters [C] . Marco Rallini, Ivan Puri, Luigi Torre, International Conference on "Times of Polymers and Composites" . 2018

机译：基于含硼的EPDM矩阵热屏蔽材料作为炭促进剂
5. Lewis base-boranes and base-alanes: Molecular building blocks for the synthesis of boron-containing clusters and solid state materials [D] . Beck, Jeffrey Scott 1989

机译：Lewis碱硼烷和碱丙氨酸：合成含硼团簇和固态材料的分子构建基块
6. A Comparative Study of Thermal Aging Effect on the Properties of Silicone-Based and Silicone-Free Thermal Gap Filler Materials [O] . A S M Raufur Chowdhury, Monjur Morshed Rabby, Mehzabeen Kabir, 2021

机译：热老化对硅氧烷基和无硅热隙填充材料性能的比较研究
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

机译：本文提供了一个新的数值模型，该模型描述了暴露于高太阳热通量（高于1 / MW / m2）的热厚木材样品的行为。基于无量纲数的初步研究用于对问题进行分类并支持模型构建假设。然后，提出了一种基于质量，动量和能量平衡方程的模型。这些方程式与液体蒸汽干燥模型和假物种生物质降解模型耦合。通过与以前的实验研究进行比较，初步结果表明，这些方程不足以准确预测高太阳热通量下的生物量行为。的确，在样品暴露的表面上形成了充当辐射屏蔽层的炭层。除了这套经典的方程式之外，还必须考虑到辐射向介质的渗透。此外，由于生物质中含有水，因此还必须在炭蒸气汽化后进行连续的介质变形。最后，通过添加这两种策略，该模型能够在一定范围的样品初始水分含量下暴露于高辐射热通量的情况下，正确捕获生物质的降解。还得出了在高太阳热通量下生物量行为的其他见解。样品内部同时存在干燥，热解和气化前沿。这三个热化学前沿的共存会导致样品干燥产生的蒸汽产生焦炭气化，这是介质烧蚀的主要现象。
8. Evaluation of Several Silicone, Phenolic, and Expoxy Base Heat-Shield Materials at Various Heat-Transfer Rates and Dynamic Pressures [R] . Chapman, A. J. 1966

机译：几种有机硅，酚醛和环氧基热屏蔽材料在各种传热速率和动态压力下的评价

Boron based fillers as char enhancers of EPDM based heat shielding materials for SRMs: A comparative analysis

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