擬ベーマイト粉末のキャラクタリゼーションと希硝酸中での解膠性

概要

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The dispersibility of various commercial pseudoboehmite powders in nitric acid solution was investigated. In order to elucidate the factors that may influence the dispersibility, the physical and chemical properties of the pseudoboehmite powders were measured and observed, such as apparent density, surface area, porosity, water desorption temperature, microstructure, and point of zero charge in aqueous solution. The microstructure of the pseudoboehmite powders affected the dispersibility. The powder, composed of dense agglomerates of fine platelet primary particles, showed a good dispersion to form sol in 0.03 M nitric acid solution. In contrast, the powder composed of porous agglomerates of wrinkled sheets, which are probably secondary particles, did not disperse well. In addition to powder properties, a drying treatment changed the dispersibility remarkably. It was observed that the dispersibility of pseudoboehmite powders decreased with increasing the drying temperature. The differential thermal analysis of the powder after the drying treatment exhibits a lower endothermic peak of moisture desorption. It is suggested that the dispersibility is related to the thickness of water molecule layer between particles.
社団法人日本セラミックス協会の論文
1999-04-01