Microwave Absorbing Properties of Pr-Co-Based Alloy with Ce Fabricated with Smelting Process
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https://doi.org/10.1007/s11664-020-08391-5 2020 The Minerals, Metals & Materials Society
Microwave Absorbing Properties of Pr-Co-Based Alloy with Ce Fabricated with Smelting Process JING-JING YU,1 SHUN-KANG PAN,1,2,3 LI-CHUN CHENG,1,2 YONG-HE LIU,1 and LEI HUANG1 1.—School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, People’s Republic of China. 2.—Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, People’s Republic of China. 3.—e-mail: [email protected]
Due to the rapid development of electromagnetic wave technology, the problem of electromagnetic pollution needs to be solved. Rare earth metals are widely studied due to their unique structure. In this study, CexPr2xCo17 (x = 0.0, 0.4, 0.6, 0.8) powders were prepared by vacuum arc furnace homogenization treatment and ball milling. The effects of Ce content on the microwave absorption performance of the CexPr2xCo17 alloy powders were measured. The reflection loss of CexPr2xCo17 powders at a given thickness of 1.8 mm was simulated by transmission line theory. The minimum reflection loss (RL) of the Pr-Co-based powders with the addition of Ce content of 0.8 reached 30.06 dB at 8.88 GHz with thickness of 1.7 mm, and the effective bandwidth (RL< 10 dB) reached about 1.86 GHz, meaning that the microwave absorbing performance of CexPr2xCo17 powders can be optimized in Xband (8–12 GHz) and C-band (4–8 GHz) frequency. Key words: CexPr2xCo17 powders, minimum reflection loss, X-band, C-band, magnetic material
INTRODUCTION Currently, inevitably involved in electrical conduction, electromagnetic interference and radiation pollution are continuously generated in our daily lives which are harmful to the human body, device operation and information security.1–3 Based on this, high-performance electromagnetic wave absorption materials are studied widely with the purpose of addressing the urgent problem.4–7 In recent decades, microwave absorbing materials have been widely applied in aviation, aerospace, new-generation miniaturized electronics and other fields. Abundant microwave absorbing materials have been studied with the increasing demand, such as polyaniline,8 carbonaceous materials,9 ferrites,10 metal oxides11 and magnetic metallic materials.12 Magnetic metal powders (Fe, Co, Ni and its
(Received August 21, 2019; accepted August 1, 2020; published online August 13, 2020)
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alloy particles) have attracted much attention due to the high magnetic permeability and magnetic loss tangent value.13–15 The absorption properties of Febased soft magnetic alloys have been researched extensively in our group.16 On the contrary, there are few studies on Co-based materials, due to the relatively poor magnetism and high price. In fact, Co-based absorbing materials have certain researchability due to the better oxidation resistance than Fe-based materials. In addition, rare earth metals and transition metals can produce a range of compounds that produce indirect exchange
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