The degradation depth of Y-TZP specimens by aging at low temperatures.
The degradation depth of Y-TZP specimens by aging at low temperatures.
复制标题
Y-TZP 样品在低温下老化的降解深度。
DOI：
10.2472/jsms.39.1590
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Tomozo Nishikawa
中科院分区：
文献类型：
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作者：
R. Shikata;Taiji Yamamoto;T. Shiono;Tomozo Nishikawa
已知氧化钇掺杂的四氧化锆多晶体（Y-TZP）的机械性能通过在空气中在100 - 300°C下老化而退化，这归因于四斜相到单斜相的转变。本文对几种不同粒度、不同比表面积的Y-TZP试样进行了热水老化试验。用薄膜X射线衍射法测定了热水老化后从表面开始的四方相到单斜相的相变区深度，发现在很近的表面处存在少量的单斜相。用比表面积为30 m2/g的氧化锆原粉在1300 ℃下烧成3小时制得的Y-TZP，其晶粒尺寸为0.15μm，即使通过200°C热水老化100小时，也仅显示少量转化的单斜相。此外，其相变深度仅为2.3μm，即使经过更长的老化时间，该深度也没有增加。
The mechanical properties of yttria-doped tetragonal zirconia polycrystals (Y-TZP) are known to be degraded by aging at 100∼300°C in air due to tetragonal to monoclinic phase transformation. In the present study, hot-water aging tests were done for several Y-TZP specimens having different grain size which were made from raw powders with different specific surface area. The tetragonal to monoclinic phase transformation zone depth from the surface after the hot-water aging was measured by a thin film X-ray diffraction method, by which the small amount of transformed monoclinic phase existing very close to the surface can be detected.Y-TZP with the small grain size of 0.15μm, made by firing at 1300°C for 3 hours using zirconia raw powder with specific surface area of 30m2/g, showed only a small amount of transformed monoclinic phase even by 200°C hot-water aging for 100 hours. Furthermore, its phase transformation depth was only 2.3μm and the depth did not increase even after a more prolonged aging time.