冲击压缩下聚四氟乙烯电阻率及冲击绝热线的实验研究

RESISTIVITY AND HUGONIOT MEASUREMENTS OF POLYTETROFLUOROETHYLENE (TEFLON) UNDER SHOCK COMPRESSION

实验测量了国产聚四氟乙烯(SFB—1)在15—40 GPa冲击压力范围内的电阻率及冲击压缩线。主要的实验结果是:电阻率是冲击压力的单调递减函数,其数值在2.45×10~5-1.73×10~3 Q·cm之间变化;冲击压缩线可用D=1.571+1.961u—0.0537u^2表示(D,u分别为冲击波速度及粒子速度,单位均为km/S)。与其他作者发表的数据相比,发现不同制造厂家生产的聚四氟乙烯材料的电阻常数值有一定的差别,但其以D—u关系表示的冲击压缩线没有出现可以觉察的变化。

Experimental results of resistivity and Hugoniot measurements for the teflon of home-made (SFB-1) in the pressure range of 10-45GPa are reported in this paper. The main results are: the resistivity is a monotonous decrease function of pressure.from 2. 45×105 Ω·cm at 10GPa to 1.73×103Ω·cm at 45GPa, and the corresponding shock adiabat may be expressed as D=1. 571 + 1.961u-0.0537u2 (D. u are shock velocity and particle velocity, respectively, both units are in km/s). In comparision with the data reported by others, it is found that there exists definite difference in the values of resistivity of the teflon samples made by different factories, but in the shock adiabat expressed as D-u relation there is no detectable difference.