Na_2O-ZrO_2-SiO_2系ゲルの合成と乾燥特性

概要

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Gel formation and drying characteristics in the system aNa_2O-bZrO_2-(100-a-b)-SiO_2(a=0, 7, 13, 18, b =3, 6, 10 mol%) were investigated. Gelling time decreased with increasing Na_2O content, perhaps due to the catalytic reaction of NaOH released from NaOC_2H_5. The release of NaOH was confirmed from pH measurements of sol mixtures with or without water. The weight loss-time curve indicated that the falling rate period decreased with increasing Na_2O content, which corresponds to a gel structure with large pore size at high Na_2O cocentrations. This was confirmed by measurement of pore size distribution on dried gels. The linear shrinkage of Na_2O-containing gels was smaller than that of Na_2O free compositions. The tendency of crack formation in gels increased with increasing Na_2 O content, but decreased with increasing ZrO_2 content. It was inferred that this was due to an easy deformable gel structure made up of linear molecules in Na_2O-free gels, or to a rigid gel structure made up of particle molecules in Na_2O-containing gels.
社団法人日本セラミックス協会の論文
1992-07-01