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Crystallization Behavior of Amorphous Si 2 BC 3 N Ceramic Monolith Subjected to High Pressure
Author(s) -
Liang Bin,
Yang Zhihua,
Chen Qingqing,
Wang Shengjin,
Duan Xiaoming,
Jia Dechang,
Zhou Yu,
Luo Kun,
Yu Dongli,
Tian Yongjun
Publication year - 2015
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.13807
Subject(s) - nucleation , crystallization , materials science , amorphous solid , crystallite , ceramic , chemical engineering , monolith , crystallography , phase (matter) , mineralogy , composite material , metallurgy , thermodynamics , chemistry , catalysis , biochemistry , physics , organic chemistry , engineering
The crystallization behavior of amorphous Si 2 BC 3 N monoliths by heating at 1000°C–1400°C and 5 GPa was investigated with the special attention to the nucleation mechanisms of β‐SiC and BN (C) phases. Nanoscale puckered structures arising in particle bridging areas were found and its evolution behavior well reflected the nucleation process of nanocrystallites. The temperature‐dependent crystallization of amorphous Si 2 BC 3 N monoliths at 5 GPa passes through four stages: The material remains amorphous below 1100°C. It undergoes partial phase segregation (1100°C–1200°C), followed by initiation of nucleation (1200°C–1250°C), and then nucleation and growth of β‐SiC and turbostratic BN (C) crystallites (>1250°C). The first principles calculation indicates the nucleation precedence of BN (C) phase over β‐SiC. BN (C) nucleates preferentially at bridges between ceramic particles causing SiC to concentrate in particle interiors thus forming capsule‐like structures.