Dispersion of Si3N4 Powders in Tert-butyl Alcohol
A high molecular weight block copolymer dispersant with pigment affinic groups —DISPERBYK163 (BYK163) was chosen to disperse submicron-sized Si3N4 in tert-butylalcohol (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 BYK 163 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.
Nonaqueous dispersant Si3N4 Rheological behavior
Yao Shenglian Lin Xuping Ma Jingtao Wang Chang-An Deng Changsheng
Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;State Key La State Key Lab of New Ceramics and Fine Processing,Beijing 100084,China;Department of Materials Scien
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
837-840
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）