Boron nitride nanocomposites assembled by nanosheets and nanotubes can exert multi‐dimensional synergistic toughening and strengthening effects. This material is expected to be a high‐efficiency reinforcement additive in advanced structural ceramics. In this study, we designed a universal method for synthesizing gram‐scale boron nitride nanocomposites by annealing the precursor containing catalyst in chemical vapor deposition equipment under flowing ammonia, and a combined growth mechanism of surface‐diffusion and solid‐liquid‐solid is proposed. The boron nitride nanosheets were initially formed by a surface‐diffusion reaction between boron trioxide and ammonia at 1300°C. At elevated temperatures (1400°C‐1500°C), the boron nitride nanotubes grew in‐situ from the nanosheets in the presence of catalysts through a solid‐liquid‐solid mechanism, forming the desired boron nitride nanocomposite.

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纳米片和纳米管组装的氮化硼纳米复合材料的大规模合成与生长机理

由纳米片和纳米管组装而成的氮化硼纳米复合材料可发挥多维协同增韧作用。该材料有望成为高级结构陶瓷中的高效增强添加剂。在这项研究中，我们设计了一种通用的方法，该方法是在流动的氨气下，通过化学气相沉积设备中的含催化剂前体退火，来合成克级氮化硼纳米复合材料，并提出了表面扩散和固液固结合的复合生长机理。氮化硼纳米片最初是通过三氧化硼和氨在1300°C之间的表面扩散反应形成的。在升高的温度（1400°C-1500°C）下，在存在催化剂的情况下，通过固液固机理，氮化硼纳米管从纳米片原位生长，