Enhanced microwave absorption properties under synergism of 0-D TiB 2 particles and 1-D TiB 2 fibers prepared by carboth
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Enhanced microwave absorption properties under synergism of 0-D TiB2 particles and 1-D TiB2 fibers prepared by carbothermal process Xiongzhang Liu1, Hui Luo2, Yingrui Li1, Fu Chen2, Xian Wang1, and Rongzhou Gong1,*
1
School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074 Wuhan, People’s Republic of China 2 School of Information Science and Engineering, Wuhan University of Science and Technology, 430081 Wuhan, People’s Republic of China
Received: 3 April 2020
ABSTRACT
Accepted: 22 July 2020
Titanium boride (TiB2) particles and fibers were synthesized by the carbothermal method with different calcination temperatures and time. Subsequently, the effects of calcination temperatures and time on microstructure and the yield of TiB2 fibers were investigated. Further, the dielectric and microwave absorption (MA) properties of TiB2/paraffin composites within 2–18 GHz were discussed. As a result, the yield of TiB2 fibers reached a maximum at 1400 °C for 180 min. The content of TiB2 was directly proportional to permittivity. The sample containing 80 wt % TiB2 particles and fibers indicated that the minimum reflection loss (RLmin) attained - 46.5 dB at 11.6 GHz when the thickness was 1.45 mm and the effective absorption bandwidth (EAB) was 4.64 GHz (RL\–10 dB) with the thickness of 1.25 mm. The related MA mechanisms were also discussed. The excellent stability, simple production procedure, thin absorbing layer, and wide EAB make TiB2 become an ideal candidate for microwave absorbing materials applied in high temperatures.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
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Introduction
Microwave absorbing materials and Electromagnetic interference (EMI) shielding materials have been aroused great attention for protecting electronic equipment from EM radiation pollution [1–4]. Many significant developments have been made in the field
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https://doi.org/10.1007/s10854-020-04076-1
of high-performance microwave absorbing materials, such as common electric loss materials, magnetic loss materials, and magnetoelectric loss materials [1,5–8]. The magnetic loss disappears when the environment temperature exceeds Curie temperature, leading to that the MA properties are sensitive to usage temperature [9]. Consequently, electric loss materials are considered as a promising research direction of high-
J Mater Sci: Mater Electron
temperature microwave absorbing materials due to their steady electric loss at high temperatures. Most of the conductive fillers of electric loss materials are composed of fibers and particles [10–12]. On the one hand, an increasing number of fibers were used as fillers of microwave absorbing materials in recent years due to the high aspect ratio, high surface area, high electrical conductivity, and defects, such as SiC, carbon, and TiC fibers [13–15]. Zhou et al. [16] prepared silicon carbide nanofibers (SiCNFs) and investigated the MA properties. The RLmin was –19.9 dB and an EAB co
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