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

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 NH3. 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.