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A New Synthesis Method for Producing Si 3 N 4 Whiskers by Heat Treating Porous Si Objects
Author(s) -
Hanjun Hu,
Wancheng Zhou,
Fa Luo,
DongMei Zhu,
Jie Xu
Publication year - 2008
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/j.1551-2916.2008.02721.x
Subject(s) - whiskers , materials science , silicon nitride , porous silicon , porosity , nitride , whisker , chemical vapor deposition , silicon , chemical engineering , monocrystalline whisker , macropore , composite material , nanotechnology , metallurgy , chemistry , layer (electronics) , catalysis , organic chemistry , mesoporous material , engineering
Silicon nitride whiskers were successfully synthesized in a porous silicon nitride body in an atmosphere of nitrogen and hydrogen gas flow by reaction bonding. Porous silicon nitride bodies, which contained 0.8 mm diameter spherical macropores and had a porosity of over 90%, were prepared by adding pore‐forming agent grains. The phase of silicon nitride whiskers was mainly α‐Si 3 N 4 , including a few β‐Si 3 N 4 and Si 2 N 2 O phases. The diameter of the whiskers was about 0.1∼1 μm and the length was higher than 10 μm. More and longer whiskers were formed on the surface of the macropores. The silicon nitride whiskers were grown using the mechanism of chemical vapor deposition.