Sulfanilic Acid: A Novel Consolidation Agent for Al2O3 in Aqueous Media |
| |
| Authors: | Jingxian Zhang Qiang Xu Mikio Iwasa Feng Ye Dongliang Jiang |
| |
| Affiliation: | National Institute of Advanced Industrial Science and Technology (AIST), Osaka 563-8577, Japan; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; The State Key Laboratory of High Performance Ceramics and Superfine Structure, Shanghai Institute of Ceramics, Shanghai 200050, China |
| |
| Abstract: | A new solidifying agent, 4-aminobenzene sulfonic acid (sulfanilic acid), is reported in this paper. The consolidation process and mechanism were followed using on viscoelastic, FTIR, SEM, and Hg porosimetry measurements. It was shown that the Al2O3 slurries with PAA-Na as dispersant exhibited a high degree of particle stabilization. After the addition of sulfanilic acid, we observed an exponential increase in the storage modulus ( G ') as a function of consolidation time. Correspondingly, Al2O3 slurries exhibited a transition from a viscous to an elastic state (in 62 min). FTIR analysis indicated that the consolidation process might follow two steps: first, the adsorption of sulfanilic acid on the Al2O3 particle surface; second, the acid–base interaction between the adsorbed PAA-Na molecules and the sulfanilic acid molecules. This interaction could possibly induce the formation of three-dimensional networks through a bridging or charge neutralization mechanism. The as-consolidated Al2O3 green samples were homogeneous, with the relative green density being 54.69%. Results showed that it was feasible to introduce sulfanilic acid for the consolidation of Al2O3 slurries in aqueous media. |
| |
| Keywords: | |
|
|
