期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 6, 页码 3333-3340出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.01.017
关键词
Polymer-Derived method; SiBN fibers; chemical; structural gradient; Multifunction
资金
- National Natural Science Foundation of China [52073304]
In this work, SiBN fibers with chemical/structural gradients were fabricated under active nitrogen atmosphere at 1700°C, showing better high-temperature stability. The formation of chemical gradient was contributed to boron atoms diffusion under B-N bond-breaking, while structural gradients were formed with graded phase separation of Si-N-B networks and crystallization behavior of Si3N4 phase. The findings may serve as a universal method to fabricate chemical/structural gradients on other boron-containing ceramics.
In this work, SiBN fibers with chemical/structural gradients under the radial direction were fabricated by onestep treatment at 1700 ?C under active nitrogen atmosphere. The formation of chemical gradient should be contributed to the boron atoms diffusion from the fiber interior to the surface, under the driven force of B?N bond-breaking in Si?N?B networks to form stable B?N bonds in the B?N?B networks at the fiber surface. Meanwhile, the structural gradients with graded phase separation of Si?N?B networks and crystallization behavior of Si3N4 phase could form under the effect of graded boron content distribution. The SiBN fibers with chemical/structural gradients showed better high-temperature stability due to the possibly synergistic effect of the decomposition resistant of boron-rich surface and the optimization of graded boron distribution. We expect our finding as a universal method to fabricate chemical/structural gradients on other boron-containing multinary ceramics with various shapes.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据