核辐射对透波材料介电性能影响

Effect of nuclear radiation on dielectric properties of wave-transmitting materials

用加速老化试验的方法,在有氧存在的条件下,研究了TDE-85环氧树脂/E玻璃纤维体系、4501A双马来酰亚胺树脂/D3W玻璃纤维体系2种透波材料介电性能受核辐射影响的规律.用60Co辐射源在辐射量为50~800 kGy范围内对样件进行辐射,用波导法测试样件的介电常数和介电损耗,测试频率为10GHz.结果发现2种体系透波材料介电性能受核辐射的影响较小,且后者比前者具有更好的抗辐射稳定性.同时利用IR,TGA等手段研究了材料介电性能变化的原因.

The effect of nuclear radiation on dielectric properties of epoxy TDE-85/glass fiber E composite and bismaleimide 4501A/glass fiber D3W composite was studied in oxygen ambience using accelerated aging mothed. After samples were irradiated by ^60Co-rays at a range of dose 50 - 800 kGy in air, the dielectric loss and dielectric permittivity of materials were measured using wave-guide method at 10 GHz. It was found that the dielectric loss and dielectric permittivity increases with radiation dose, but increasing is not much, and the antiradiation property of 4501A/glass fiber D3W composite is better than that of TDE-85/glass fiber E composite. The change reasons of the dielectric property were analyzed using infrared （IR） and dynamic thermo gravimetric analysis （TGA） .