Dispersion of Si3N4 Powders in Tert-Butyl Alcohol

Sheng Lian Yao; Xu Ping Lin; Jing Tao Ma; Chang An Wang; Chang Sheng Deng

doi:10.4028/www.scientific.net/KEM.512-515.837

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515Dispersion of Si3N4 Powders in Tert-Butyl Alcohol

Dispersion of Si₃N₄ Powders in Tert-Butyl Alcohol

Abstract:

A high molecular weight block copolymer dispersant with pigment affinic groups — DISPERBYK163 (BYK163) was chosen to disperse submicron-sized Si3N4 in tert-butyl alcohol (TBA) solvent. The stability of Si3N4 powders in TBA with dispersant BYK163 was studied by sedimentation. To achieve good casting behavior, rheological measurement was employed to find a reasonable dispersant content in the slurry. The adsorption isotherm of BYK163 on Si₃N₄ particles surface was obtained by thermogravimetric analysis (TGA). Based on the surface chemical properties of Si₃N₄ particles, the dispersing phenomena and mechanism of BYK163 in TBA were summarized. BYK163 could form a steric layer on the surface of Si₃N₄ particles, and effectively prevent particles agglomeration. Therefore, porous Si₃N₄ samples with porosity of 40% to 80% could be prepared from Si₃N₄ slurries with low and high solid loadings due to well dispersion with BYK163 addition.

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Periodical:

Key Engineering Materials (Volumes 512-515)

Pages:

837-840

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.512-515.837

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Online since:

June 2012

Authors:

Sheng Lian Yao, Xu Ping Lin, Jing Tao Ma, Chang An Wang, Chang Sheng Deng

Keywords:

Si₃N₄, Nonaqueous Dispersant, Rheological Behavior

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