ジルコニアセラミックスの水熱環境における強度特性と組織構造の相関性

概要

論文の詳細を見る
High-temperature and high-pressure water corrosion behaviors of Y_2O_3 doped Zirconia (ZrO_2) were investigated in term of with the microstructural changes, residual strength characteristics and tetragonal to monoclinic phase transformation. Sintered ZrO_2 ceramics bodies with 2, 3, 4, 6 and 8 mol% Y_2O_3 doped ZrO_2 were made using a pressure less sintering method at 1 450℃, respectively. These ZrO_2 ceramics were corroded in high-temperature and high-pressure water condition such as 150℃〜300℃. Corrosion damage of the decrease Y_2O_3 dope ZrO_2 ceramics occurred preferentially on ZrO_2 particle after long-term immersion in high-temperature and high-pressure water environment. The tetragonal to monoclinic phase transformation occurred in decrease Y_2O_3 doped tetragonal ZrO_2 ceramics due to high-temperature and high-pressure water corrosion. For improvement of the corrosion characteristics (thermal stability) of the ZrO_2 ceramics, are important increasing the Y_2O_3 doped within a range in which no remarkable residual strength degradation is recognized. CeO_2 doped ZrO_2 ceramics were useful to improvement the thermal stability of Y_2O_3 doped ZrO_2 without loss of the fracture strength. CeO_2 doped ZrO_2 ceramics also have superior residual strength characteristics compared to Y-ZrO_2 ceramics. In addition design concepts used to obtain water-corrosion-resistant high strength and high toughness ZrO_2 ceramics were proposed.
社団法人日本機械学会の論文
2001-05-25

ジルコニアセラミックスの水熱環境における強度特性と組織構造の相関性

スポンサーリンク

概要

著者

関連論文

スポンサーリンク