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Synthesis of well‐dispersed β‐Si 3 N 4 with equiaxed structures using carbothermal reduction–nitridation method
Author(s) -
Sun SiYuan,
Ge YiYao,
Tian ZhaoBo,
Zhang Jie,
Chen KeXin,
Xie Zhipeng
Publication year - 2017
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.15078
Subject(s) - equiaxed crystals , carbothermic reaction , dispersity , materials science , chemical engineering , phase (matter) , crystal structure , crystal (programming language) , metallurgy , crystallography , microstructure , chemistry , organic chemistry , carbide , programming language , computer science , polymer chemistry , engineering
Well‐dispersed β‐Si 3 N 4 powders with a novel equiaxed structure and eminent crystal integrity were prepared by carbothermal reduction–nitridation ( CRN ) strategy with the assistance of CaF 2 additive. The growth mechanism of Si 3 N 4 particles in the CRN process was elucidated. It is proposed that the liquid phase formed by SiO 2 and CaF 2 additive is crucial to the formation of equiaxed β‐Si 3 N 4 , and with an appropriate content of CaF 2 , Si 3 N 4 powders with pure β phase, superior dispersity and crystal integrity can be obtained.