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Combustion synthesis of well‐dispersed rod‐like β‐Si 3 N 4 crystals by the addition of carbon
Author(s) -
Zhang Jie,
Cui Wei,
Tian Zhaobo,
Sun Siyuan,
Chen Kexin,
Liu Guanghua
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.16847
Subject(s) - carbon fibers , materials science , combustion , silicon , oxide , chemical engineering , crystallography , analytical chemistry (journal) , chemistry , composite material , metallurgy , organic chemistry , composite number , engineering
The well‐dispersed rod‐like β‐Si 3 N 4 crystals have been prepared by combustion synthesis with the addition of carbon. The added carbon helps to separate Si particles and remove the SiO 2 oxide layer, and thus reduces the agglomeration of β‐Si 3 N 4 crystals. By adding carbon, the reaction temperature and the width of β‐Si 3 N 4 crystals are decreased, but the aspect ratio of β‐Si 3 N 4 crystals is increased. The well‐dispersed β‐Si 3 N 4 crystals with an average width of 0.84 μm and aspect ratio of 2.3 are produced by adding 2 wt% carbon. When 5 wt% carbon is added, the reaction temperature is too low and the nitridation of Si becomes incomplete, and at the same time much SiC occurs in the product.