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Formation of Nanocrystalline Silicon Carbide Powder from Chlorine‐Containing Polycarbosilane Precursors
Author(s) -
Mitchell Brian S.,
Zhang Haoyue,
Maljkovic Nikica,
Ade Martin,
Kurtenbach Dirk,
Müller Eberhard
Publication year - 1999
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.1151-2916.1999.tb02070.x
Subject(s) - nanocrystalline material , materials science , thermogravimetric analysis , crystallization , silicon carbide , polysilane , chemical engineering , equiaxed crystals , chlorine , mineralogy , microstructure , nanotechnology , metallurgy , composite material , chemistry , polymer , engineering
Nanocrystalline ß‐SiC particulates with a grain‐size range of 5‐20 nm were prepared by heating a prepyrolyzed, chlorine‐containing polysilane/polycarbosilane (PS/PCS) to 1600°C. The transformation from the prepyrolyzed PS/PCS to nanocrystalline SiC was investigated by differential thermal analysis, thermogravimetric analysis, X‐ray diffractometry, mass spectrometry, and infrared spectroscopy. The results indicated that the nanocrystalline ß‐SiC was formed by the crystallization of the PS/PCS random network and the crosslinking of Si‐Si, Si‐Cl, and Si‐CH 2 ‐Si bonds. Transmission electron microscopy observation showed that SiC particulates consisted of equiaxed, randomly oriented, ultrafine grains.