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Large‐scale synthesis and growth mechanism of boron nitride nanocomposite assembled by nanosheets and nanotubes
Author(s) -
Wang Heng,
Xu Man,
Ping Hang,
Fu Zhengyi
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17307
Subject(s) - boron nitride , materials science , nanocomposite , chemical engineering , nitride , chemical vapor deposition , boron , annealing (glass) , nanotechnology , ceramic , catalysis , metallurgy , chemistry , layer (electronics) , organic chemistry , engineering
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.