氧化锆系的相结构和转变

Phase Structure and Transformation of Zirconia

ZrO2 随温度变化 ,历经单斜、四方和立方三个相系。通过DTA分析和X衍射技术研究低温水合ZrO2 和高温ZrO2 的相变过程 ,证实了氧化锆相系变化的特性 ,表明ZrO2 由单斜向四方转变时 ,产生滞后效应 ,其温区范围在 93 0～ 1170℃之间。这是一个可逆的相转变过程 ,在常温下稳定的只是单斜ZrO2 。在ZrO2 中添加阳离子可以稳定氧化锆相系 ,使之在常温下获得稳定的四方相和立方相ZrO2 。用X射线衍射研究了添加阳离子固溶氧化锆的机理和稳定化的作用。还评述了氧化锆三个相结构的特性和它的差异性。

ZrO 2 has monoclinic, tetragonal and cubic structures with temperature changes With the study of phase changes of lower temperature Hydrous Zirconia and high temperature zirconia by DTA and X ray diffraction analysis, we confirm the properties of zirconia phase systems. It indicates that it will lead to hysteresis within 930～ 1170 ℃ It is a reversible transition The monoclinic phase is stable at normal temperature ZrO 2 added with Y 2O 3 will increase its phase with stable tetragonal and cubic structures The paper indicates mechanism and role of solidification by adding positive ions to zirconia, and commends the properties and diversity of zirconia phase structures, too