Dispersibility of pretreated polyacrylic acid‐modified SiC powder. Issue 6 (12th August 2020)

• Record Type: Journal Article
• Authors: Sun, Yexian; Niu, Yifan; Liu, Ting; Liu, Jiaxiang
• Is Part Of: International journal of applied ceramic technology. Volume 17:Issue 6(2020)
• Page Start: 2690
• Page End: 2696
• Publication Date: 2020-08-12
• Subjects: dispersibility SiC powder -- polyacrylic acid -- pretreatment -- surface adsorption; Ceramics -- Periodicals; Ceramics -- Technological innovations -- Periodicals; 620.1405
• DOI: 10.1111/ijac.13589
• Languages: English
• ISSNs: 1546-542X

Abstract

Abstract: A slurry with high dispersibility is crucial for slip casting technology. The weakly acidic SiC powder with high dispersibility was prepared with polyacrylic acid pretreated by the sodium hydroxide (adjusted pH = 5). The pretreated polyacrylic acid can be effectively adsorbed on the surface of SiC powder, and its utilization efficiency (37%) was better than the unpretreated one (21%). The modified SiC powder with pH = 6 was obtained by polyacrylic acid modification, and the maximum solid content was 61.2 Vol%. The optimum of the pretreated polyacrylic acid addition amount was 1 wt% based on Zeta potential, solid content, and viscosity analysis data. Compared with the unmodified SiC, the Zeta potential absolute value of the modified (−63 mV) was higher due to a large amount of anionic modifier adsorbed on particle surfaces. The modified SiC slurry was more stable because the modification increases the electrostatic repulsion among the SiC molecules.