Dispersion Behavior of ZrB₂ Powder in Aqueous Solution

Authors: Lee, Sea-Hoon¹; Sakka, Yoshio¹; Kagawa, Yutaka²

Source: Journal of the American Ceramic Society, Volume 90, Number 11, November 2007 , pp. 3455-3459(5)

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Abstract:

Dispersion conditions of ZrB₂ powder in water were investigated using poly(ethyleneimine) (PEI) as a dispersant. Pulverization of ZrB₂ powder to submicrometer size was difficult and a substantial amount of large particles remained after an intensive planatery milling for 72 h. The isoelectric point (IEP) of ZrB₂ powder was measured to be pH 5.8 by electrophoresis, which shifted to pH 6.2 after milling. The application of PEI changed the IEP of the boride slurry to ∼pH 11. Well-dispersed aqueous ZrB₂ slurries with a high solid loading (up to 45 vol%) were fabricated at pH 6.5-7.5 by the application of 1.5 wt% PEI.

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2007.01949.x

Affiliations: 1: Composite Material Group, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan 2: Research Center for Advanced Science and technology (RCAST), University of Tokyo, Tokyo 153-8505, Japan

Publication date: 2007-11-01