星用热缩套管力学性能钴源辐照效应研究

^(60)Co Radiation Effects on the Mechanical Properties of Heat-shrinkable Sleeves for Satellites

目的研究星用热缩套管的力学性能(断裂伸长率和拉伸强度)在空间辐射环境中的退化情况。方法利用钴源放射的γ射线模拟地球轨道粒子辐照环境,通过表面形貌分析、辐解气体分析、X射线光电子能谱分析、红外光谱分析等多种手段分析热缩套管力学性能退化的原因。结果辐照后热缩套管颜色变深,力学参数出现严重退化现象。在最大辐照剂量下,材料断裂伸长率由414.3%下降为0.06%,拉伸强度由17.43 MPa下降为2.15 MPa,热缩套管原有力学性能几乎完全丧失。结论热缩套管主链出现断链现象,生成可挥发的CO2,CH4等气体,从而导致样品力学性能严重退化。

Objective To research the degradation of the mechanical properties（elongation at break and tensile strength） of heat-shrinkable sleeves for satellites in the spatial radiation environments. Methods The reason for the degradation of mechanical properties of the heat-shrinkable sleeves was analyzed in the simulated earth＇s orbit particle radiation environment with γ rays radiated by 60 Co through various means, such as surface topography analysis, radiolysis gas analysis and infrared spectrum analysis with X-ray photoelectron spectroscopy, etc. Results The result indicated that the color of the heat-shrinkable sleeves became darker after being radiated and there was obvious degradation of the mechanical properties. The elongation at break of the materials degraded from 414.3% to 0.06%, and the tensile strength degraded from 17.43 MPa to 2.15 MPa at the maximum radiation. The original mechanical properties of the heat-shrinkable sleeves were almost completely lost. Conclusion The main chain of heat-shrinkable sleeve is broken and volatile gases CO2 and CH4, etc. are generated, which causes the degradation of the mechanical properties.