论文部分内容阅读
材料真空出气性能是卫星设计选材时的一个重要依据,辐照是对材料出气性能影响较为严重的一种空间环境因素。本文对Co源辐照(1.2×10~9rad,Si)前后的材料样品,进行100及125℃条件下真空出气参数试验;结合红外光谱、扫描电镜、热重分析测试手段,研究辐照环境对聚乙烯电缆护套材料(SF-30-35)出气性能的影响。研究表明:经过辐照后的聚乙烯电缆护套材料样品的总质量损失及可凝挥发物量真空出气参数显著增加;Co源辐照使材料性质发生很大变化,辐照前材料表面为韧性网状结构,辐照后材料表面明显硬化,力学性能由柔韧变为干脆易断;辐照使材料发生氧化断链及交联反应,真空出气试验时断链产生的分子逸出。上述结果说明辐照环境改变了电缆护套材料特性,加速了材料真空环境下的出气性能。
The material vacuum venting performance is an important basis for the selection of satellite design. Irradiation is a kind of space environment factor that has a serious impact on the material outlet performance. In this paper, the parameters of vacuum outlet gas before and after irradiation of Co source (1.2 × 10 ~ 9 rad, Si) were tested under 100 and 125 ℃. Combining with infrared spectroscopy, scanning electron microscopy and thermal gravimetric analysis, Polyethylene cable sheathing material (SF-30-35) Outlet performance. The results show that the total mass loss and the amount of condensable volatiles in the sample after irradiation are significantly increased. The irradiation of Co source greatly changes the properties of the material, and the surface of the material before irradiation is a ductile mesh Like structure, the surface of the material is obviously hardened after irradiation, and the mechanical property changes from being soft to being brittle; the irradiation causes the material to undergo oxidative chain scission and cross-linking reaction, and molecules generated by chain scission in the vacuum gas venting escape. The above results show that the irradiation environment changes the material properties of the cable sheathing and accelerates the outgassing performance of the material in a vacuum environment.