Zirconium-containing polyborosilazane precursor aerogel, silicon-boron-carbon-nitrogen/zirconium dioxide ceramic aerogel, and preparation method and application of ceramic aerogel

Abstract

The invention discloses a zirconium-containing polyborosilazane precursor aerogel, a silicon-boron-carbon-nitrogen / zirconium dioxide ceramic aerogel, and a preparation method and application of the ceramic aerogel. Through combination of a silicon-hydrogen addition reaction and CO2 supercritical drying, the highly porous zirconium-containing PBSN precursor ceramic aerogel is prepared by taking polyborosilazane and ZBO as precursors; and then the SiBCN-ZrO2 ceramic aerogel is synthesized by a conventional precursor conversion method. The microstructure and physical properties of the obtained samples are characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and X-ray diffraction (XRD), and the results show that the formation temperature and themaximum crystallization transition temperature of an SiBCN matrix are improved through addition of zirconium. The zirconium-containing precursor aerogel and the SiBCN-ZrO2 ceramic aerogel both have relatively good mesoporous structures. Meanwhile, the specific surface area, the pore volume and the average pore diameter of the SiBCN-ZrO2 ceramic aerogel are respectively 98.1204 m<2>g<-1>, 0.4832 cm<3>g<-1> and 14.47 nm at a temperature of 1350 DEG C, and the sintered ceramic aerogel mainly consists of ZrO2, beta-SiC and Si3N4 crystalline phases and an SiBCN amorphous phase.

Description

technical field [0001] The invention relates to the technical field of airgel materials, in particular to a zirconium-containing polyborosilazane precursor airgel, a silicon boron carbon nitrogen / zirconia ceramic airgel and a preparation method and application thereof. Background technique [0002] As a high melting point material, SiBCN has better high temperature and chemical stability, thermal shock resistance, low thermal expansion coefficient, high hardness and other characteristics than binary ceramics such as SiC and BN and ternary ceramics such as SiOC and SiCN. A potential high temperature resistant airgel material matrix. Zirconium dioxide airgel has excellent chemical stability, thermal stability, insulation and light-shielding properties, as well as acidic and alkaline surface active centers and good ion exchange properties, so that it can be used in catalysts, adsorbents, etc. application. SiBCN-ZrO 2 Airgel can not only combine the good chemical and thermal ...

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Problems solved by technology

However, it is difficult to form a uniformly distributed solution in the solid-liquid mixing system adopted by this method, and it is inevitable that the dispersion problem caused by gravity will occur when the insoluble solid powder is introduced into the liquid, so that the material of the prepared composite material cannot be obtained. to achieve equality, thereby limiting its performance

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