Fabrication and Mechanical Properties of CeO2 Stabilized Tetragonal Zirconia Based Nanocomposites Incorporating Al2O3 Dispersions
Fabrication and Mechanical Properties of CeO2 Stabilized Tetragonal Zirconia Based Nanocomposites Incorporating Al2O3 Dispersions
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掺有 Al2O3 分散体的 CeO2 稳定四方氧化锆基纳米复合材料的制备和机械性能
DOI：
10.2497/jjspm.43.415
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
K. Niihara
中科院分区：
文献类型：
--
作者：
M. Nawa;S. Nakamoto;Keiichi Yamazaki;T. Sekino;K. Niihara
为了弥补CeO_2稳定的四方氧化锆多晶(Ce-TZP)与Y-TZP陶瓷相比强度低、硬度低的缺点，我们将纳米复合材料的思想应用到Ce-TZP/Al_2O_3复合体系中。这些复合材料中的氧化锆基质主要由四方相和少量的单斜相组成。这些复合材料部分具有晶内纳米结构，其中细小的氧化铝颗粒被包裹在氧化锆晶内。在最佳成分下，在1500℃下烧结的10Ce-TZP/30ol%Al_2O_3复合材料的强度为730 Mpa，韧性为10.2 Mpa·m1/2(SEPB)。这一韧性值超过了WC/Co金属陶瓷的韧性(8.1兆帕⋅m1/2)。因此，该复合体系有望成为一种既具有Y-TZP的高强度，又具有Ce-TZP的高韧性，并具有良好的抗低温退化性能的TZP陶瓷。
To compensate the definite disadvantages of ceria stabilized tetragonal zirconia polycrystal (Ce-TZP) as compared to Y-TZP ceramics, such as lower strength and lower hardness, we applied the idea of the nanocomposite to Ce-TZP/Al2O3 composite system. Zirconia matrix in these composites consisted of primarily the tetragonal phase and a small amount of the monoclinic phase. These composites partly possessed an intragranular nanostructure, in which fine alumina particles were trapped within the zirconia grains. At an optimum component for the 10Ce-TZP/30vol% Al2O3 composite sintered at 1500°C, strength of 730 MPa and very high toughness of 10.2 Mpa.m1/2 (SEPB) were achieved. This toughness value was in excess of that (8.1 MPa⋅m1/2) of WC/Co cermet. Therefore, it is suggested that this composite system would be expected as candidate for an attractive TZP ceramics, which have advantages of both high strength in Y-TZP and high toughness in Ce-TZP along with high resistance to low-temperature degradation.