Effect of TMAH on the rheological behavior of alumina slurries for gelcasting

Journal of Asian Ceramic Societies

Guohong Zhou¹  Shunzo Shimai¹  Jin Zhao¹  Jian Zhang¹  Shiwei Wang¹  Yi Sun¹  Xiang Peng¹ 

[1] The State Key Laboratory on High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;

关键词: Gelcasting;    Slurry;    Hydrolysis enhancement;    Hydrophobic modification;    Shear-thickening behavior delay;   

DOI  :  10.1016/j.jascer.2017.05.002

来源: DOAJ

【 摘 要 】

Tetramethyl ammonium hydroxide (TMAH) has been demonstrated to increase solids loading effectively and to accelerate gelling rate of alumina slurries gelled by Isobam (a copolymer of isobutylene and maleic anhydride) system. With 0.5 vol% addition of TMAH, solids loading of alumina slurry was increased from 56 vol% to 58 vol%. Meanwhile, storage modulus (G’) of the slurry with 56 vol% solids loading was increased from 964 Pa to 2850 Pa at a testing time of 30 min. The enhanced dispersing and gelling behavior was ascribed to the hydrolysis and hydrophobic modification of Isobam by TMAH. Flexural strength of the final alumina ceramics from 58 vol% solids loading was 543 ± 10 MPa, higher than that of the ceramics from 56 vol% solids loading (531 ± 13 MPa).

【 授权许可】

Unknown