Hollow boron nitride short rod and preparation method thereof

A preparation method of the hollow boron nitride short rod mainly comprises the following steps: taking sodium hydroxide, boric acid and magnesium chloride as raw materials, and reacting at room temperature to obtain a boron-containing precursor; then, mixing the boron-containing precursor, potassium borohydride, potassium chloride, ammonium chloride and borane ammonia complex, and putting the mixture into a high-pressure reaction kettle for reaction, so as to obtain boron nitride with a hollow rod-shaped structure. The hollow boron nitride short rod is prepared by a high-pressure molten salt method synthesis process, and is uniform in morphology and high in purity. 本发明涉及一种空心氮化硼短棒，其制备方法主要过程如下：以氢氧化钠、硼酸和氯化镁为原料，室温反应获得含硼前驱体；然后，将含硼前驱体、硼氢化钾、氯化钾、氯化铵和硼烷氨络合物混合放入高压反应釜内反应，从而得到空心棒状结构的氮化硼。本发明通过用高压熔盐法的合成工艺制备了一种空心氮化硼短棒，形貌均一、纯度高。