开孔泡沫铝导电性的研究

Investigation of the Electrical Conductivity of Open-cell Aluminum Foams

本文采用加压渗流方法制备开孔结构的泡沫铝,并通过调整工艺参数改变泡沫铝的孔径和相对密度。采用“直流四端电极”法测量了不同参数泡沫铝的电阻,研究开孔泡沫铝的导电性随其相对密度和孔径的变化规律。实验结果表明:随着相对密度的提高,开孔泡沫铝的电导率增大,且电导率随相对密度的改变呈指数关系变化;当相对密度参数基本相同时,随着泡沫铝孔径的减小,由于在制备过程中产生的结构缺陷增多,其电导性下降。

The open-cell aluminum foams have been produced by pressure infiltrating process, and the structural parameters such as cell size and porosity of the aluminum foams were controlled by adjusting process parameter. The electrical conductivity of the aluminum foams of different parameters was measured by the ＂four point＂ method to investigate their relationship with the relative density and pore size of the foams. The results show that the electrical conductivity of the aluminum foams increases with increasing their relative density, and the power law function can be successfully applied to describe the dependence of electrical conductivity of foams. For the aluminum foams with a roughly same relative density, more defects were created in the foam of smaller pore size, and a lower electrical conductivity is obtained, compared with that of larger pore size.