Premium
Microstructure and Thermo‐Kinetics Analysis in Combustion Synthesis of Si 3 N 4 with High α‐Phase Content
Author(s) -
Ge Yiyao,
Cui Wei,
Wang Qi,
Zou Yifeng,
Xie Zhipeng,
Chen Kexin
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.13251
Subject(s) - combustion , materials science , microstructure , phase (matter) , quenching (fluorescence) , chemical engineering , kinetics , silicon nitride , silicon , nitride , nitrogen , morphology (biology) , cluster (spacecraft) , composite material , metallurgy , chemistry , organic chemistry , fluorescence , physics , layer (electronics) , quantum mechanics , biology , computer science , engineering , genetics , programming language
In this work, Si 3 N 4 powders containing ~88% by weight of α‐phase were prepared by adopting a facile yet efficient combustion synthesis strategy under a nitrogen pressure of 6 MPa. A unique radial–spheroidal cluster morphology was strikingly observed in the as‐fabricated Si 3 N 4 products. More significantly, a three‐step growth mechanism was rationally proposed herein based on quenching experiments and thermo‐kinetic calculations. As concluded, both the combustion temperature achieved and the sustaining time in high‐temperature period played significant roles in obtaining silicon nitride powders with controlled high contents of α‐phase Si 3 N 4 .