摘要
由 Mg O和 Y2 O3 或 Ce O2 复合稳定的 Zr O2 在高温热处理过程中 ,发生立方相向四方相的相变 .由于 Y2 O3 或 Ce O2 和 Mg O的复合作用 ,相变过程中产生大量介稳的 t- Zr O2 析出体 .t- Zr O2 析出体随稳定剂含量不同而呈现不同形貌 :Mg O含量高时 ,t- Zr O2 析出体的形状类似于 Mg- PSZ中的析出体 ;稀土稳定剂含量较高时 ,析出体的形状为 tweed和 colony结构 .四方析出体与立方基体的关系承袭二元系的位向关系 ,为 [0 0 1 ] c∥ [0 0 1 ] t.c- Zr O2 相变过程中生成介稳立方相 c - Zr O2 和 Mg
The cubic zirconia ceramics stabilized by yttria,ceria or magnesia transform to tetragonal phase and a great amount of tetragonal phase precipitate from cubic matrix when ageing at high temperature.Two kinds of precipitates could be identified according to the differences of stabilizers and their existed forms.Tetragonal precipitates with higher magnesia content are similar to the form of precipitates in Mg PSZ.As the content of rare earth oxides increases,the morphology of precipitates is similar to the form in Y PSZ,it takes like tweed or colony structure.The orientation relationship between cubic and tetragonal phase is [001] c∥[001] t,the same as the relationship of the binary systems of MgO ZrO 2 and Y 2O 3 ZrO 2.In addition c ZrO 2 transformation produced metastabilized c ZrO 2 and MgO.
出处
《天津城市建设学院学报》
CAS
2000年第1期6-9,共4页
Journal of Tianjin Institute of Urban Construction
基金
国家"8 6 3"和国家自然科学基金资助项目! ( 5950 2 0 0 3)
高温结构陶瓷与工程陶瓷加工技术国家教育部重点实验室
关键词
复合PSZ
微观结构
相变增韧
complex partially stabilized zirconia
microstructure
phase transformation toughening
