Dispersion of Zirconium Diboride in an Aqueous, High Solids Paste

Abstract

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.

Department(s)

Materials Science and Engineering

Sponsor(s)

Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)

Keywords and Phrases

Aqueous Paste; Dispersion; High Solids Paste; ZirconiumDiboride

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2007 Wiley-Blackwell, All rights reserved.

Publication Date

01 Jan 2007

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