CeO_2-ZrO_2系微粒子の水熱合成及び焼結

概要

論文の詳細を見る
Fine powders in CeO_2-ZrO_2 system have been prepared from the precipitate mixtures of cerium(III) nitrate solution, zirconium oxychloride solution and an excess amount of ammonia under hydrothermal conditions at 180℃, and their changes in crystal phase and surface area by calcination, sinterability, the crystal phase and the microstructure of the sintered bodies have been investigated. Twelve mol% CeO_2-doped fine zirconia powders hydrothermally synthesized showed metastable cubic zirconia phase without monoclinic phase and they gradually transformed into tetragonal phase by calcining at above 600℃. The samples except for 12 mol% CeO_2-ZrO_2 consisted of two phase mixtures of zirconia and ceria. The crystallite size of 12 mol% CeO_2-doped zirconia particles and CeO_2 particles in the 70 mol% CeO_2-ZrO_2 powder was about 6 nm and 20 nm, respectively. Dense CeO_2-ZrO_2 ceramics were obtained by sintering these powders at above 1400℃ for 1h. The sinterability of the powders increased with increasing CeO_2 concentration. The calcined 80 mol% CeO_2-ZrO_2 powders pressed at 98 MPa reached a maximum density with single cubic CeO_2 solid solution at 1300℃ for 1h. The average grain size of 12 mol% CeO_2-doped tetragonal zirconia ceramics sintered at 1500℃ was 1.5 μm. Although the grain size of the sintered body in the two-phase region (tetragonal zirconia and cubic CeO_2 solid solution) was below 1.0 μm, it increased with increasing CeO_2 concentration within the single phase region of cubic CeO_2 solid solution.
社団法人日本セラミックス協会の論文
1996-10-01

CeO_2-ZrO_2系微粒子の水熱合成及び焼結

スポンサーリンク

概要

著者

関連論文

スポンサーリンク