掺杂Sm_2O_3对Y-ZrO_2陶瓷烧结行为和性能的影响

Effects of Sm_2O_3 Addition on Sintering Behavior and Property of Y-ZrO_2 Ceramics

一定量的Sm2O3粉末与3%Y2O3（摩尔分数）稳定的四方ZrO2粉体（Y-ZrO2）经球磨混合、造粒后,在钢模中压制成形,所得压坯在1450~1600℃下烧结后,得到不同Sm2O3掺杂量的Sm2O3掺杂Y-ZrO2（SY-ZrO2）陶瓷烧结体。对不同温度下烧结所得烧结体试样的相组成、密度、电导率、硬度以及抗弯强度等性能进行了测试分析。实验结果表明：将适量的Sm2O3掺入Y-ZrO2中,可以获得具有立方结构的SY-ZrO2陶瓷烧结体,且其密度、硬度和抗弯强度与Sm2O3的掺杂量有关;Sm2O3的加入提高了Y-ZrO2陶瓷的电导率,掺杂0.5%Sm2O3的SY-ZrO2陶瓷800℃时在空气中的离子电导率可达0.02 S.cm-1。本试验的初步实验结果显示,采用二元稀土氧化物（Sm2O3和Y2O3）复合掺杂ZrO2陶瓷材料,可以在保持其良好力学性能的同时,提高其电导率,拓展其应用领域。

The zirconia co-doped by samaria and yittria（SY-ZrO2） ceramics with different samaria doping amount were prepared by tetragonal zirconia（Y-ZrO2） powders stabilized by samaria and yittria mixture,and followed by pressing the powder mixes and sintering the green compacts at different temperatures.The phase composition,microstructure,as well as physical and mechanical properties of the sintered SY-ZrO2 samples were investigated.The results showed that the samaria and yittria co-doped zirconia（SY-ZrO2） with cubic structure could be obtained by adding proper amount of Sm2O3 into Y-ZrO2.The relative density,hardness and bending strength of the sintered SY-ZrO2 samples depended on Sm2O3 doping amount.The electrical conductivity of the SY-ZrO2 ceramics could be improved obviously by the doping of Sm2O3.An electrical conductivity of 0.02 S·cm-1 could be achieved for SY-ZrO2 ceramics with 0.5% of samaria at 800 ℃ in air.The present work revealed that samaria and yittria co-doped zirconia（SY-ZrO2） ceramics possesed good mechanical properties and high electrical conductivity,and have the potential for use in some new applications.