Co源辐照对聚乙烯电缆护套材料真空出气性能影响  

Outgassing Properties in Vacuum of Polythene Cable Irradiated by Co60 Radioactive Source

作　　者：于钱[1] 臧卫国[1] 周晶晶[1] 杨东升[1] 院小雪[1] 姜海富[1] 武博涵 

机构地区：[1]北京卫星环境工程研究所,北京100094

出　　处：《真空科学与技术学报》2016年第4期454-458,共5页Chinese Journal of Vacuum Science and Technology

摘　　要：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。Here,we experimentally addressedthe outgassing behavior,induced by radiation of charged particles,of the componentsinstalled in satellite in space environment.In the ground simulation,the impact of the Co60-radiation,of an exposure of 1.2 × 10^9 rad（Si）,on the mechanical and outgassing properties of the polythene cable（SF-30-35）,at 100℃（125℃） and 7 × 10^-3 Pa,was investigated with infrared spectroscopy（IR）,scanning electron microscope,and thermal gravimetric analysis（TGA）.The results show that the Co60-radiation,significantly affects the outgassing and mechanical properties of the polythene surfaces.For example,the Co60-radiation dramatically increased the total mass loss（TML） and collected volatile condensable material（CVCM） by tens of time.The Co60-radiation significantly hardened the flexible surface-texture of the polythene tube,turning its ductility into brittleness.In addition,the Co60-radiation resulted in an effusion of radicals,possibly because of the radiation induced bond-breaking and bond cross-linking of polythene molecules.

关 键 词：真空 总质量损失 可凝挥发物 Co源辐照 聚乙烯电缆 

分 类 号：TB303[一般工业技术—材料科学与工程]