天然ルチル及びアナターゼ精鉱を使用したK_2Ti_6O_<13>繊維とその関連複合繊維の合成 : K_2Ti_2O_5繊維の誘導体として

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K_2Ti_6O_<13> fibers and its related composite fibers were prepared as derivatives of K_2Ti_2O_5 fibers having a layered structure by a compositional-structural change technique. The K_2Ti_2O_5 fibers were prepared by crystallizing from a melt using a mixture of the natural rutile (95% TiO_2) or anatase (90% TiO_2) ores and K_2CO_3 powder in an attempt to reduce the fabrication cost. The composition of K_2Ti_2O_5 fibers was controlled by extracting K^+ in interlayer with water, boiling water and treating with dilute acid solution, and then the structural change was carried out by heat- treatment above 1000℃. The water treatment is essentially to produce K_2Ti_6O_<13> fibers, and the boiling water-treatment, to produce K_2Ti_6O_<13>-TiO_2(rutile) - K_<1.5>Fe_<1.5>Ti_<6.5>O_<16> (priderite) composite fibers, and the dilute acid solution- treatment, to make anatase or rutile fibers. The melting temperature of K_2Ti_6O_<13> phase of the obtained fibers was measured by DTA. The K_2Ti_6O_<13> single phase from rutile ore melted congruently at 1352℃, that in the composite fibers from the same ore at 1316℃, and that in the composite fibers from anatase ore at 1332℃. Thermal conductivities of sintered disk prepared from the obtained fibers are estimated at a temperature range from 300 K to 1100 K, and the K_2Ti_6O_<13> and composite fibers were found to be good heat-inshulators.
社団法人日本セラミックス協会の論文
1988-11-01