基于热分解动力学的航天电线长周期寿命研究

Long-Cycle Life Estimation of Spaceflight Wire Based on Thermal Degradation Kinetics

含氟聚合物绝缘电线通常作为航天用电线,具有柔软、耐高低温、优异的耐化学环境等性能。随着科技的进步,航天器在轨寿命延长,电子元器件也需要能够保证在长周期内保持稳定的性能。由此,对发展较早的聚四氟乙烯(PTFE)、聚全氟乙丙烯(FEP)、可熔性聚四氟乙烯(PFA)绝缘航天电线进行了长周期寿命研究。为表征上述航天电线在高温下的长周期寿命能力,从热分解动力学理论着手,采用Kissinger最大失重率法和Ozawa等失重百分率法计算了电线绝缘材料PTFE、FEP和PFA的分解活化能,并根据"时温等效"原理,预估了PTFE、FEP和PFA绝缘航天电线在使用温度下的寿命。

Fluoropolymer insulated wires are usually used as spaceflight wires,which have the properties of softness,high and low temperature resistance,excellent chemical environment resistance,etc.With the progress of science and technology,spacecraft in orbit need life extension,electronic components also need to be able to maintain stable performance over a long period of time.Therefore,the long-cycle life of PTFE,FEP and PFA insulated spaceflight wires with earlier development is studied.In order to characterize the long-cycle life ability of the abovementioned spaceflight wires at high temperature,starting from the theory of thermal degradation kinetics,the degradation activation energy of PTFE,FEP and PFA is calculated by the Kissinger’s maximum weight loss rate method and Ozawa’s equal weight loss percentage method.According to the principle of"time-temperature equivalence",the life of PTFE,FEP and PFA insulated spaceflight wires at service temperature is estimated.