Dispersion of Si3N4 Powders in Tert-butyl Alcohol

被引：1

作者：

Yao Shenglian ^{[1
,2
]}

Lin Xuping ^{[1
,2
]}

Ma Jingtao ^{[1
,2
]}

Wang Chang-An ^{[2
,3
]}

Deng Changsheng ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Inst Nucl & New Energy Technol, Beijing 100084, Peoples R China

[2] State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

[3] Tsinghua Univ, Dept Mat Sci & Engn, Beijing 100084, Peoples R China

来源：

HIGH-PERFORMANCE CERAMICS VII, PTS 1 AND 2 | 2012年 / 512-515卷

基金：

中国国家自然科学基金;

关键词：

Nonaqueous dispersant; Si3N4; Rheological behavior; CERAMICS;

D O I：

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

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 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.

引用

页码：837 / +

页数：2

共 7 条

[1]

Bergstrom L., 1996, J AM SOC, V79, P33

[2] Microstructure and Properties of Porous Si3N4 Ceramics with a Dense Surface [J].