By utilizing polymer-derived ceramics (PDCs) method and electrospinning technology, SiCN(Ni) fibers with 1 wt% nickel content at different calcination temperatures (1000–1300 °C) were synthesized. The properties of PDCs-SiCN(Ni) fibers were tested by XRD , SEM, TEM, Raman spectroscopy , XPS and vector network analyzer. The results showed that the addition of nickel acetylacetonate (NA) promoted the in-situ formation of CNTs and Ni 2 Si at high temperatures, which could adjust the impedance matching performance and improve the electromagnetic wave (EMW) absorption properties. The minimum reflection loss (RL) of SiCN(Ni) fibers was −47.55 dB (4.2 mm), and the effective absorption band (EAB, RL ≤ −10 dB) was 3.6 GHz (14.4–18 GHz) under the ultra-thin thickness of 1.24 mm.
The PDCs (polymer-derived ceramics)-SiCN(Ni) fibers with multiple loss mechanisms were prepared by electrospinning. Influenced by the in-situ formed CNTs and Ni 2 Si at the high treatment temperature, the impedance matching performance of fibers was enhanced obviously. In addition, the electromagnetic wave (EMW) absorbing performance was further improved by unique one-dimensional structure of fibers, interfacial polarization, dipole polarization and magnetic loss. Because of good impedance matching and multiple losses, fibers possessed admirable EMW characteristic with strong absorbing ability of the minimum reflection loss (RL) reaching −44.88 dB and the widest effective absorption band (EAB) reaching 4.8 GHz (13.2–18 GHz) at 1.42 mm. Hence, SiCN(Ni) ceramics prepared had a wide application in the field of electromagnetic absorption.
危险品化学品经营许可证（带存储）