Characterization of Heterogeneous Microstructure Evolution in ZrO2–3 mol%Y2O3 during Isothermal Sintering
Characterization of Heterogeneous Microstructure Evolution in ZrO2–3 mol%Y2O3 during Isothermal Sintering
复制标题
ZrO2–3 mol%Y2O3 等温烧结过程中非均相微观结构演化的表征
DOI：
10.1111/j.1551-2916.2007.02052.x
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发表时间：
2007
影响因子：
3.9
通讯作者：
K. Ewsuk
中科院分区：
文献类型：
--
作者：
I. Nettleship;Tian;K. Ewsuk
使用孔边界镶嵌和定量体视学来表征ZrO 2 - 3 mol% Y2 O3（3 YSZ）的微观结构演变，该ZrO 2 - 3 mol% Y2 O3（3 YSZ）已被压制至46%的绿色密度并在1275°C下等温烧结0.1-10 h。扫描电子显微照片表明，相对于经典的烧结模型，烧结的3 YSZ微观结构是空间异质性，这种异质性影响的方式，在烧结过程中的微观结构演变。孔边界镶嵌细胞图显示存在致密区域内的微观结构，生长的优先消除较小的孔隙，并导致在更长的烧结时间更大更广泛的孔隙率。因此，平均孔隙分离距离的增加比平均晶粒尺寸快得多。这将使人们对使用晶粒尺寸作为预测这种材料的致密化动力学的微观结构尺度的量度产生疑问。
Pore boundary tessellation and quantitative stereology were used to characterize microstructure evolution in ZrO 2 -3 mol%Y 2 O 3 (3YSZ) that had been pressed to a green density of 46% and isothermally sintered at 1275°C for 0.1-10 h. Scanning electron micrographs showed that, relative to classical sintering models, the sintered 3YSZ microstructure was spatially heterogeneous, and that this heterogeneity affected the way in which the microstructure evolved during sintering. Pore boundary tessellation cell maps revealed the presence of dense regions within the microstructure that grew by the preferential elimination of smaller pores and resulted in larger more widely spaced porosity at longer sintering times. In consequence, the average pore separation distance increased much faster than the average grain size. This would call into question the use of the grain size as a measure of microstructural scale for the prediction of densification kinetics for this material.