Dispersion of Zirconium Diboride in an Aqueous, High Solids Paste
The dispersion of ZrB2 particles was investigated. in aqueous systems, the surface of ZrB2 consists of a thin layer of ZrO2 that controls the surface chemistry and surface charge. Measurements showed that the ZrB2 had an isoelectric point of pH=4.7 and a maximum ζ potential of −50 mV at pH=9. the addition of a dispersant, either an ionic ammonium polyacrylate or a nonionic alkoxylated polyether, increased the ζ potential of ZrB2 by as much as 60 mV to −110 mV. Viscosity measurements were used to optimize dispersant concentrations. High-solids loading (~45 vol.% ZrB2) aqueous pastes were prepared with two different dispersants. the pastes had viscosities of 40-50 Pa·s which was acceptable for extrusion, and were used to fabricate three-dimensional components from ZrB2.
T. Huang et al., "Dispersion of Zirconium Diboride in an Aqueous, High Solids Paste," Wiley-Blackwell, Jan 2007.
The definitive version is available at http://dx.doi.org/10.1111%2Fj.1744-7402.2007.02157.x
Materials Science and Engineering
Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
Keywords and Phrases
Aqueous Paste; Dispersion; High Solids Paste; ZirconiumDiboride
Article - Journal
© 2007 Wiley-Blackwell, All rights reserved.