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Dispersion Behavior of ZrB2 Powder in Aqueous Solution

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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.
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Document Type: Research Article

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

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