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Pyrolysis of Preceramic Polymers in Ammonia: Preparation of Silicon Nitride Powders
Author(s) -
Burns Gary T.,
Chandra Grish
Publication year - 1989
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.1151-2916.1989.tb06129.x
Subject(s) - pyrolysis , silicon nitride , polymer , ammonia , materials science , amorphous solid , nitride , chemical engineering , carbon fibers , silicon , carbon nitride , organic chemistry , chemistry , nanotechnology , composite material , composite number , metallurgy , catalysis , layer (electronics) , photocatalysis , engineering
The pyrolysis of cross‐linked polycarbosilanes, polysilanes and polysilazanes in an ammonia atmosphere to 1473 K yields amorphous, low‐carbon silicon nitride powders. The efficacy of carbon removal is independent of the polymer's structure or functionality but is partially dependent on the initial cross‐linking temperature. The amorphous silicon nitride powders partially crystallize to α‐Si 3 N 4 by 1773 K.