Thermal and ablative properties of rocket insulator compound based on EPDM
Thermal and ablative properties of rocket insulator compound based on EPDM
复制标题
DOI：
10.1016/0141-3910(88)90062-6
复制
发表时间：
1988
影响因子：
5.9
通讯作者：
A. S. Deuri;A. Bhowmick;R. Ghosh;B. John;T. Sriram;S. De
中科院分区：
文献类型：
--
作者：
A. S. Deuri;A. Bhowmick;R. Ghosh;B. John;T. Sriram;S. De
通过将三元乙丙橡胶绝缘料暴露在实验室等离子弧射流烧蚀环境中，研究了该材料的热性能和烧蚀性能。随着石棉加入量的增加，复合材料的烧蚀速率和质量损失减小，烧蚀热增大。这是由于降低了导热系数和提高了硫化胶的热稳定性。软木填充的复合材料也观察到了类似的结果。在高负荷下结焦的增加改善了软木填充硫化胶的烧蚀性能。Fe_2O_3对硫化胶的分解起催化作用，在低含量时，由于Fe_2O_3催化了硫化胶的分解，导致烧蚀速率和烧蚀失重率增加，烧蚀热降低。但在相对较高的载荷下，烧蚀性能略有改善，因为Fe2O3在边界处起到保护层的作用，减少了烧蚀过程中的材料损失。然而，含有石棉、软木和Fe_2O_3三种成分的绝缘料的烧蚀性能有了很大的提高。提出了绝缘体烧蚀的机理。
The thermal and ablative properties of insulator compound based on EPDM have been investigated by exposing the compound to the ablative environment produced by a plasma arc jet in the laboratory. The effect of individual fillers has also been studied.The rate of erosion and mass loss decrease and the heat of ablation increases with increase in asbestos loading in the rubber composite. This is due to reduction in thermal conductivity and enhanced heat stability of the vulcanizate. Similar results have been observed for cork-filled composite. An increase in char formation at high loading improves the ablation properties of cork-filled vulcanizates. Fe2O3-filled composite shows peculiar behaviour in the sense that there is an initial increase in rate of erosion and rate of mass loss and a decrease in the heat of ablation at low loading of Fe2O3, because Fe2O3catalyses the decomposition of the vulcanizates. But at relatively higher loading, ablative properties improve marginally as Fe2O3acts as a protective layer at the boundary and reduces the material loss during ablation. However, the ablative properties of the insulator compound containing all three components, namely, asbestos, cork and Fe2O3, exhibit great improvement. A mechanism of ablation of the insulator compound has been suggested.