Fabrication and microwave-transparent property of fluffy SiBNO ultrafine fibers by electrospinning

Abstract SiBNO ceramic fibers are promising materials in radar-wave-transparent applications due to their excellent dielectric property and high mechanical strength. In this paper, three-dimensional (3D) fluffy SiBNO ultrafine fibers were fabricated by electrospinning of polyborosiloxane (PBSO) sol and pyrolysis up to 1000 °C under NH 3 . The construction of fluffy structure was well manipulated through adjusting the environmental humidity during the electrospinning process. The obtained SiBNO fibers with typical amorphous structure display a uniform distribution with an average diameter of 1.5 μm. Moreover, the SiBNO fibers exhibit excellent dielectric property with the average dielectric constant and loss tangent of 4.44 and 0.0029 at 2–18 GHz, respectively. These fluffy architectures demonstrate great potentials in nano-composite materials, which can promote precursor impregnation into three dimensions.