CaO/Y_(2)O_(3)共稳ZrO_(2)复相陶瓷显微结构和力学性能研究  

Study on Microstructure and Mechanical Properties of CaO/Y_(2)O_(3)Co-stabilized ZrO_(2)Composite Ceramics

作　　者：袁子奇 李子繁 陈瑾萱 廖为民 卢杰 崔恒 饶平根[1] YUAN Ziqi;LI Zifan;CHEN Jinxuan;LIAO Weimin;LU Jie;CUI Heng;RAO Pinggen(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学材料科学与工程学院,广州510640

出　　处：《中国陶瓷》2023年第2期22-29,共8页China Ceramics

基　　金：广东省2016年扬帆创新创业研究团队项目(2016YT03G125)。

摘　　要：采用传统固相法制备了不同CaO和不同Y_(2)O_(3)掺杂量的ZrO_(2)复相陶瓷。借助XRD、SEM、EDS、维氏硬度计等测试手段研究了复相陶瓷的显微结构及力学性能。结果表明CaO/Y_(2)O_(3)共稳ZrO_(2)复相陶瓷的显微结构中共有大、中、小三种不同尺寸的ZrO_(2)晶粒。CaO的掺入在细化晶粒的同时可以降低中型t-ZrO_(2)晶粒内Y稳定剂含量,提高t-ZrO_(2)相变量;Y_(2)O_(3)能降低基体中m-ZrO_(2)的体积分数。当Y_(2)O_(3)掺入量为1.8 mol%,CaO掺入量为2 mol%时,获得了最高的断裂韧性(5.4±0.2 MPa·m1/2);当Y_(2)O_(3)掺入量为2.5 mol%,CaO掺入量为1 mol%和2 mol%时,分别获得了最高的抗弯强度(785±37 MPa)和硬度值(13.3±0.2 GPa)。CaO/Y_(2)O_(3)co-stablilized ZrO_(2)composite ceramics with different CaO or Y_(2)O_(3)addition amounts were prepared by a traditional solid-phase method.The microstructure and mechanical properties of the ZrO_(2)ceramics were investigated by XRD,SEM,EDS and Vickers hardness.The experimental results show that the microstructure of CaO/Y_(2)O_(3)co-stablilized ZrO_(2)ceramics has three different sizes of ZrO_(2)grains:large,medium and small.Doping of CaO can reduce the grain size of t-ZrO_(2)and increase the phase transformability;Y_(2)O_(3)can reduce the volume fraction of m-ZrO_(2)in the matrix.The highest fracture toughness(5.4±0.2 MPa·m1/2)was achieved at Y_(2)O_(3)content of 1.8 mol%and CaO content of 2 mol%;The highest flexural strength(785±37 MPa)and hardness values(13.3±0.2 MPa)were achieved at Y_(2)O_(3)content of 2.5 mol%,CaO content of 1 mol%and 2 mol%,respectively.

关 键 词：ZrO_(2)陶瓷 显微结构 相变增韧 断裂韧性 

分 类 号：TQ174.758.11[化学工程—陶瓷工业]