Effect of erbium doping on phase composition, mechanical and thermal properties of ZrO_(2)-based ceramics  

作　　者：Zheng Cao Shengli An Xiwen Song 

机构地区：[1]School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices,Inner Mongolia University of Science and Technology,Baotou O14010,China [3]School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China

出　　处：《Journal of Rare Earths》2022年第10期1628-1634,共7页稀土学报（英文版）

基　　金：Project supported by the National High Technology Research and Development Program of China(2015AA034403);the National Natural Science Foundation of China(Grant No.51762036)。

摘　　要：Er_(x)Ti_(0.1)Zr_(0.9-x)O_(2-1.5 x)(x=0.04,0.05,0.06,0.07,0.08) ceramics were synthesized by a solid-state reaction method.The influence of the Er^(3+) addition on the phase composition,Vickers hardness,fracture toughness,and thermal conductivity of this ceramic material was investigated.The X-ray diffraction results reveal that the c-ZrO_(2) content increases from 1.85 vol% to 33.89 vol%,and the percentage of t-ZrO_(2) decreases from 98.15 vol% to 66.11 vol% with the increase in Er^(3+) content from 4 mol% to 8 mol%.Moreover,the addition of Er^(3+) is beneficial to the volume expansion of the unit cell.At the same time,the incorporation of Er^(3+) weakens the coordination of oxygen ions around the metal cations,resulting in a corresponding decrease in the tetragonality of the t-ZrO_(2).The Vickers hardness and fracture toughness of the Er_(x)Ti_(0.1)Zr_(0.9-x)O_(2-1.5)_(x) ceramics show increasing and decreasing trends,respectively.The thermal conductivity has a significant decline due to point defects caused by the Er^(3+) doping.The 8 ETZ ceramic exhibits the highest Vickers hardness(12.7 GPa),the lowest fracture toughness(7.6 MPa·m^(1/2)),and the lowest average thermal conductivity(1.85 W/(m·K)) in the temperature range of 200-1000℃.All of the above properties are higher than those of the Y_(2)O_(3)-stabilized ZrO_(2) ceramic.

关 键 词：Er_(2)O_(3) Phase composition Vickers hardness Fracture toughness Thermal conductivity Rare earths 

分 类 号：TQ174.1[化学工程—陶瓷工业]