High-entropy alloy wave-absorbing material with reflection loss reaching -60.9dB and preparation method for high-entropy alloy wave-absorbing material

Abstract

The invention discloses a high-entropy alloy wave-absorbing material with a reflection loss reaching -60.9dB. A molecular formula of the high-entropy alloy wave-absorbing material is FeNiCr<c>Al<d>, wherein a, b, c and d respectively represent atomic percent values of corresponding metal elements. The invention further discloses a preparation method for the wave-absorbing material. The method comprises the following steps of: 1, weighing raw material powder according to a target product; 2, filling the powder into a glove box filled with argon, and conducting sealing; 3, conducting ball milling; and 4, taking out a ball mill tank, and placing the ball mill tank in the glove box filled with the argon for opening to obtain the high-entropy alloy wave-absorbing material. For the high-entropy alloy wave-absorbing material disclosed by the invention, through the composition characteristics of multiple elements, the coupling effect of multiple loss mechanisms is exerted, so that the wave-absorbing performance of the high-entropy alloy wave-absorbing material is cooperatively improved, an effective absorption bandwidth is relatively large, energy consumption is relatively low, and the raw material cost is reduced. The preparation method disclosed by the invention is simple in process operation without complex equipment, low in cost and beneficial to large-scale production.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a high-entropy alloy wave-absorbing material with a reflection loss of -60.9dB and a preparation method thereof. Background technique [0002] With the rapid development of modern electronic industry technology and the extensive use of electronic and electrical equipment, while providing convenience for people's lives, electromagnetic pollution is becoming more and more serious. In addition, the continuous advancement of radar detection technology makes military combat equipment extremely easy to be detected, tracked, and attacked by the enemy. Especially for stealth aircraft, aircraft carriers, etc. in high-temperature and corrosive environments, there is an urgent need for new wave-absorbing materials with high-temperature oxidation resistance and strong corrosion resistance. [0003] Studies have shown that due to the effect of "entropy" in high-e...

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Problems solved by technology

At present, there are few studies on high-entropy alloy absorbing materials. Although the reported FeNiCo-based high-entropy alloys show good absorbing properties, there are still the following problems: (1) The effective absorption bandwidth is narrow; the maximum reflection loss value is average Not greater than -60dB, thickness more than 2mm; (2) high energy consumption; usually requires subsequent heat treatment or magnetic field annealing to show excellent absorbing ability, and the preparation process is complicated; (3) high cost; the price of the contained Co element High, and the subsequent processing increases the production cycle while further increasing the production cost

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