徐冷焼成法によるチタン酸カリウム繊維の成長反応

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The growth of potassium titanate fibers was studied by a new growth technique called “slow-cooling calcination method”. By this method, a specific composition is incongruently melted into a solid phase and liquid phase, and then is slowly cooled to a temperature region below the incongruent-melting temperature. Fibrous crystals are grown by a incongruent melt-association reaction between the solid and liquid phases during the cooling precess. In the system K2Ti2O5-K2Ti6O13, a stating material having the n value between 2<n<6 in the K2O⋅nTiO2 formula was incongruently melted into a liquid phase and K2Ti6O13 solid phase at above the incongruent-melting temperature (1114°C±15°C) of K2Ti4O9, and then was slowly cooled to a temperature region below 1114°C. During the slow-cooling process, the incongruently melted K2Ti6O13 solid phase and liquid phase again reacted to associate. This association reaction plays a very important role to grow potassium titanate fibers, especially K2Ti4O9 fibers. Relatively long fibers were grown in the mixed fibers of K2Ti4O9 and K2Ti2O5 when a starting material of K2O⋅2.8TiO2 composition was calcined at 1150°C for 4h, and then was slowly cooled to 950°C with a rate of 16°C/h, and was followed by quenching to room temperature. Consequently, the K2Ti4O9 fibers in them were grown by an incongruent melt-association reaction, and the K2Ti2O5 fibers were crystallized from the liquid phase during the quenching process. The growth of K2Ti4O9 fibers was mainly depended upon three factors of starting composition, calcination temperature and cooling rate, and furthermore was also promoted by repeating the incongruent melt-association reaction.
社団法人日本セラミックス協会の論文
1983-04-01

徐冷焼成法によるチタン酸カリウム繊維の成長反応

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