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为了解EPDM绝热材料烧蚀过程中炭化层表面相态,以及在热态环境下炭化层的抗冲击结构特点,设计了一种表面碰撞试验装置。利用设计的试验装置,在含铝5%的复合推进剂燃气环境中,对一种EPDM绝热材料进行了炭化层表面相态探测试验,清晰地获得了撞击后的炭化层表面形貌。试验结果分析表明:在本研究条件下,EPDM绝热材料炭层表面基本上是以固态形式存在,没有较厚液态层存在的迹象;在高温燃气环境下,受到冲击后的表面炭化层会产生脆裂,影响其烧蚀性能。试验结果可为EPDM绝热材料烧蚀机理研究和烧蚀模型建立提供有力的试验支持。
In order to understand the phase state of the carbonized layer during the ablation process of EPDM insulation and the impact structural characteristics of the carbonized layer under the hot environment, a surface impact test device was designed. By using the designed test device, the phase state of carbonized layer was tested on a kind of EPDM insulation material in a composite propellant gas environment containing 5% aluminum, and the surface morphology of the carbonized layer after impact was clearly obtained. The experimental results show that the surface of the carbon layer of the EPDM insulation basically exists as a solid state under the conditions of this study, and there is no evidence of the existence of a thick liquid layer. Under the high temperature gas environment, the surface carbonized layer subjected to the impact will be brittle Crack, affecting its ablation performance. The test results can provide strong experimental support for ablation mechanism research and ablation model establishment of EPDM insulation materials.