Microstructure of Y2O3 doped Al2O3/ZrO2 eutectic fibers grown by the micro-pulling-down method
Microstructure of Y2O3 doped Al2O3/ZrO2 eutectic fibers grown by the micro-pulling-down method
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DOI：
10.1016/s0022-0248(01)01451-8
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发表时间：
2001-09-01
影响因子：
1.8
通讯作者：
Waku, Y
中科院分区：
文献类型：
--
作者：
Lee, JH;Yoshikawa, A;Waku, Y
用微下拉法制备了不同Y_2O_3含量的Al_2O_3/ZrO_2共晶纤维。研究了共晶组织和力学性能随生长速率和Y2O_3掺杂量的变化规律。在0.1~15 mm/min的拉拔速率范围内，生长出直径0.3~2min、长度500min的Y_2O_3掺杂Al_2O_3/ZrO_2共晶纤维。随着Y_2O_3掺杂量的增加，氧化锆的主晶相由单斜晶型转变为立方晶型。共晶组织的取向与生长速率和Y2O3的掺杂量有关。当生长速度低于1 mm/min时，均匀的片层结构转变为椭圆形的胞状结构；中等生长速度的细胞呈圆形或三面状。晶胞间距随Y_2O_3掺杂量的增加而增大。以15 mm/min的速率生长的9摩尔%Y_2O_3掺杂光纤的硬度值达到20 GPA。以15 mm/min的速率生长的3mol%Y_2O_3掺杂光纤的室温拉伸强度最高可达2000 Mpa，1500℃时最高可达560 Mpa。(C)2001 Elsevier Science B.V.保留所有权利。
Al2O3/ZrO2 eutectic crystal fibers containing various amounts of Y2O3 were grown by the micro-pulling-down method. The eutectic microstructures and some mechanical properties were investigated as a function of growth rate and doping amount Of Y2O3. Doped with Y2O3, Al2O3/ZrO2 eutectic fibers 0.3-2 min in diameter and 500 min in length have been grown over the range of pulling rate 0.1-15 mm/min. The dominant zirconia phase was changed from monoclinic to cubic as the doping amount of Y2O3 increased. The eutectic microstructures were oriented to a common direction which depended on the growth rate and doping amount Of Y2O3. The uniform lamellar structure obtained at a lower growth rate below 1 mm/min transformed to an ellipsoidal cellular structure at a growth rate above 10 mm/min. and circular or triply facetted cellular patterns were observed at intermediate growth rates. The intercellular spacing increased as the doping amount of Y2O3 increased. The hardness value reached 20 GPa for 9 mol% Y2O3 doped fibers grown at a rate of 15 mm/min. The highest tensile strength reached 2000 MPa at room temperature and 560 MPa at 1500 degreesC for the 3 mol% Y2O3 doped fibers grown at a rate of 15 mm/min. (C) 2001 Elsevier Science B.V. All rights reserved.