稀土La_2O_3对Y_2O_3-ZrO_2烧结行为和力学性能的影响  

Effect of Rare Earth La_2O_3 on Sintering Behavior and Mechanical Properties of Y_2O_3-ZrO_2

作　　者：毛征宇[1] 徐健建 颜建辉[1] 

机构地区：[1]湖南科技大学机电工程学院,湖南湘潭411201

出　　处：《热加工工艺》2015年第2期62-65,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51241010);江苏省新型环保重点实验室开放课题基金资助项目(AE200108);湖南省教育厅资助科研项目(11B047)

摘　　要：在Y2O3-Zr O2中加入不同含量(0.3wt%、0.5wt%、1.2wt%)的稀土La2O3,考察La2O3-Y2O3-Zr O2陶瓷在不同温度下的烧结行为和室温力学性能。结果表明:适量的La2O3促进了Y2O3-Zr O2陶瓷的烧结。随烧结温度的升高,La2O3-Y2O3-Zr O2烧结体的致密度和力学性能增加。La2O3含量为0.3wt%时,La2O3-Zr O2烧结体致密度和力学性能最大。与Y2O3-Zr O2相比,0.3wt%La2O3-Y2O3-Zr O2陶瓷的抗弯强度、硬度和断裂韧性分别提高了200%、100%和50%。力学性能的改善归因于La2O3的活化烧结、晶粒细化和弥散强化作用。Y203-ZrO2 ceramics added rare earth La203 with different contents （0.3wt%, 0.5wt% and 1.2wt%） were fabricated by pressurelsss sintering. The sintering behaviors and mechanical properties of La2OrY203-ZrO2 in the room temperature were investigated. The results show that the moderrate La203 accelerates the sintering of 8wt% Y203-ZrO2. With the increase of sintering temperature, the relative density and mechanical properties of La203-Y2OrZrO2 gradually increase. The density and mechanical properties of La203-Y203-ZrO2 is maximum when the content of La203 is 0.3wt%. Compared with Y203-ZrO2, the bending strength, hardness and toughness are improved by 200%, 100% and 50%, respectively. The improvement of mechanical properties is attributed to the activated sintering, grain refinement and dispersion strengthening.

关 键 词：Y2O3-ZrO2 LA2O3 烧结行为 力学性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程]