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Corrosion of ZrB2 Powder During Wet Processing – Analysis and Control

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Corrosion behavior of ZrB2 powder during wet processing in water or ethyl alcohol was studied both with and without an organic additive. Incorporation of oxygen and pH change did not intensively occur during static aging of aqueous slurries, but corrosion was enhanced when stirring the slurries. The oxygen content of the powder increased rather rapidly with milling time in ethyl alcohol. The molecular weight of polyethylenimine effected the pH change and oxygen content of ZrB2 powder, after corrosion in water for 18 months. X-ray photoelectron spectroscopy analysis informed that the surface of both the pristine and corroded powders was mainly covered with ZrOH, but a certain amount of Zr–B bonding remained at the powder surface after the wet processing.
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Document Type: Research Article

Affiliations: 1: Composite and Coating Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan 2: Nanoceramic Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan 3: Research Center for Advanced Science and Technology (RCAST), University of Tokyo, Tokyo 153-8505, Japan

Publication date: May 1, 2008

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