アルコキシド系乾式分散剤の粉砕助剤効果と作用機構

概要

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Effect of metal alkoxides as grinding aids in grinding of electrofused alumina powders and the reaction mechanisms were investigated. Dry grinding experiments with and without grinding aids were made using a vibration mill up to 320 h. Particle size distribution and specific surface area of powders were measured to estimate the degree of grinding. The degree of dispersion-cohesion of ground powders was evaluated from an angle of repose and particle shape observation by SEM. Surface tension of metal alkoxide liquids and contact angle between metal alkoxide liquids and sintered alumina surface were also measured. Addition of grinding aids caused acceleration of grinding and dispersion for their ground powders. The following two major reasons were considered for these effects. (1) Surface tension of metal alkoxide liquid is smaller than that of water. (2) Hydrolysis of alkoxide excludes water, which tends to cause cohesion of powders, and also forms butyl alcohol which acts as grinding aid itself.
社団法人日本セラミックス協会の論文
1990-03-01