Preparation method of raspberry-shaped SiCxNyOz microspheres converted by polysilazane: Fid-Bau Portal

Preparation method of raspberry-shaped SiCxNyOz microspheres converted by polysilazane

LI ZHENBAO / HE JIABEI / LIU XUEQIAN

The invention discloses a preparation method of raspberry-shaped SiCxNyOz microspheres converted by polysilazane, and the method comprises the following steps: 1, using divinyl benzene, polysilazane containing carbon-carbon double bonds, 2,2'-azodiisobutyronitrile and acetonitrile to prepare a mixed liquid; 2, carrying out heating reaction on the mixed liquid, repeatedly conducting washing, and carrying out vacuum filtration and vacuum drying to obtain initial powder; and 3, carrying out sintering treatment under the protection of an inert atmosphere, and conducting cooling to room temperature to obtain the raspberry-shaped SiCxNyOz microspheres. The raspberry-shaped SiCxNyOz microspheres with a large number of nanoscale protrusions formed on the surfaces and a secondary micro-nano structure are obtained by controlling the proportion of solute, an initiator and solvent, the heating reaction temperature and the sintering temperature rise rate, and the raspberry-shaped SiCxNyOz microspheres have a large number of nanoscale interfaces and are beneficial to loss and absorption of electromagnetic wave energy, so that the raspberry-shaped SiCxNyOz microspheres have good wave-absorbing performance and is expected to be applied to the civil or military field as a wave-absorbing agent or a wave-absorbing coating.

本发明公开了一种聚硅氮烷转化的覆盆子状SiCxNyOz微米球制备方法，该方法包括：一、将二乙烯基苯、含碳碳双键聚硅氮烷、2，2′‑偶氮二异丁腈和乙腈配制成混合液体；二、将混合液体加热反应后进行反复洗涤，经真空抽滤和真空干燥后得到初始粉体；三、在惰性气氛保护下进行烧结处理并冷却至室温，得到覆盆子状SiCxNyOz微米球。本发明通过控制溶质、引发剂与溶剂的配比、加热反应温度以及烧结升温速率，得到表面形成大量纳米级凸起、具有二级微纳结构的覆盆子状SiCxNyOz微米球，具备大量的纳米级界面，有利于电磁波能量的损耗和吸收，从而具有良好的吸波性能，有望作为吸波剂或吸波涂层应用于民用或军事领域。

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