Synthesis And Electromagnetic Wave Absorbing Properties Of A Polymer-Derived Sibnc Ceramic Aerogel

In this work, SiBNC ceramic aerogels were prepared by the hydrosilylation reaction between precursor polyborosilazane and a cross-linking agent divinylbenzene in a highly diluted solvent, with the presence of Karstedt catalyst. The obtained SiBNC ceramic aerogels possess the characteristics of light weight, high porosity, and relatively wide pore size distribution (3-140 nm). The electromagnetic wave (EMW) absorption of the SiBNC aerogels was studied by a vector network analyzer. When the solvent fraction was 90%, the sample thickness was 3.0 mm, and the SiBNC aerogel had good absorption properties with a reflection loss of 25.05dB@16.07 GHz. These SiBNC ceramic aerogels also showed excellent temperature resistance and a unique three-dimensional network structure. They are thus expected to find application in the high-temperature absorption field.