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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.115  No.1348 (December) (2007)  >  pp.982-986

Journal of the Ceramic Society of Japan
<<Previous article Vol.115  No.1348 (December) (2007)   pp.982 - 986 Next article>>

Influence of Network Structure on Abnormally High Viscosity of Mixed Slurries of Silicon Carbide Nanopowder and Polycarbosilane

Masaki NARISAWA1), Hiroyuki KADO1), Ryota MORI1), Masanori YOSHIDA1), Hiroshi MABUCHI1), Akira KOHYAMA2) and Mitsuhiko SATOH3)
1) Graduate School of Engineering, Osaka Prefecture University
2) Institute of Advanced Energy, Kyoto University
3) Ube Industries Ltd.


  Silicon carbide powder, polycarbosilane (PCS) and xylene mixed slurries were prepared for viscosity measurement and microstructure observation. Absolute slurry viscosity and shear rate dependence of viscosity were investigated at various SiC concentrations and particle sizes. Temperature dependence of viscosity was also investigated. As the primary particle size in powders decreases, viscosity increases relatively at a low SiC concentration. Microstructure observation on diluted slurries revealed the existence of secondary particles composed with primary nanoparticles and network formation by physically or chemically contacted secondary particles. Some of the microstructure changes with shearing was consistent with a strong shear thinning phenomenon of slurry viscosity.



Keyword:
Silicon carbide, Precursor method, Powder, Slurry, Viscosity, Shear thinning, Ceramic matrix composite

Received: September 25, 2007
Accepted: October 18, 2007 , Published online: December 01, 2007
Copyright (c) 2007 The Ceramic Society of Japan

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