Preparation And Properties Of The Absorbing Material Of Aluminum Magnetic Fe Nanowire Array

Nano-scale material is an important developing direction of radar absorbing materials. Firstly, microwave-absorbing aluminum base composites with magnetic iron nanowire array were successfully prepared by electrochemical deposition in porous anodic aluminum oxide template. The nanowire array in the aluminum oxide template can not only prevent the problems of electronic conduction between metal fibers and being caduceus of overlaying materials, but resolve difficulties of fabrication and appliance of structural radar absorbing materials. The aluminum base composites with iron nanowire array have showed excellent microwave absorbing properties and important promising in application.Samples were fabricated in different conditions of anodization, electrochemical deposition and surface treatment procedures. Their structures and microwave absorbing properties were studied by optics cameral, XRD, SEM and microwave absorbing testing. Then effects of fabricating procedures on structures and properties were concluded.Stepping down the voltage after anodic oxidation can reduce the compact layer at the bottom of porous one, and that benefits electrochemical deposition. Porous anodic aluminum oxidation has no effects on microwave absorption, but Fe nanowire arrays work. Anodization at lower temperature can make oxidation thicker, density of nanowire lower and diameter smaller. Samples of anodization temperature at -1 ℃ have better microwave absorption properties than 13 ℃. It is clarified that samples oxidated in electrolyte of vitriol have thicker oxidation, higher density of nanowire, larger nano-hole and higher length-diameter ratio, then have better properties on microwave absorption than of oxalic acid. Current impulse can thin nanowire and make electrochemical deposition of Fe nanowire arrays uniform, which made their microwave absorbing properties improved. With depositing time prolonged, quantity of Fe nanowire deposited and the length-diameter ratio increased, which made their microwave absorbing properties improved; but when Fe was over deposited on the surfacewhich has lead to electronic conduction between metal fibers, with depositing time prolonged, the microwave absorbing properties deteriorated. Making the surfaces of samples accidented can make nanowire with various direction, which has greatly improve the microwave absorbing properties.