王晓静，宋希文，谢敏，张永和

( 内蒙古科技大学材料与冶金学院，内蒙古包头014010)

关键词: 热障涂层; 相结构; 相稳定性; 热膨胀

中图分类号: TB383. 1 文献标识码: A

摘要: 采用固相反应法制备了Yb2O3-Y2O3-Ta2O5-ZrO2

陶瓷材料( 简称YbTYSZ) ．分别利用X-ray 衍射( XRD) 仪、扫描电子显微镜( SEM) 和高温综合热膨胀仪对陶瓷材料的物相组成及相稳定性、显微结构和热膨胀性进行了分析． XRD 结果表明: 1 873 K 烧结6 h 的YbTYSZ 陶瓷材料由单一的四方相组成，且经1 573 K 等温热处理250 h 后仍表现为单一的四方相结构，说明该陶瓷材料在高温下具有良好的相稳定性．随着Yb3 + 掺杂量增多，晶粒尺寸增大且变的均匀．此外，在室温至1 573 K，YbTYSZ 陶瓷材料的平均热膨胀系数呈现先减小后增大的规律．

Phase structure，phase stability and thermal expansion property of Y0．18 － x Ybx Ta0．18 Zr0． 64 O2 material

WANG Xiao-jing ，SONG Xi-wen，XIE Min，ZHANG Yong-he

( Materials and Metallurgy School，Inner Mongolia University of Science and Technology，Baotou 014010，China)

Key words: solid state reaction; phase structure; phase stability; thermal expansion

Abstract: Yb2O3-Y2O3-Ta2O5-ZrO2( YbTYSZ) ceramics were synthesized by solid state reaction method． Phase structure，phase stability，microstructure and thermal expansion behavior were characterized using X-ray diffraction ( XRD) ，Scanning Electronic Microscopy ( SEM) and dilatometer． The XRD results indicated that the YbTYSZ ceramics sintered at 1873K for 6 h were composed of solely tetragonal phase ． The ceramics heat-treated at 1 573 K for 250 h displayed a single phase of tetragonal ，which indicated that the ceramics possessed good phase stability at high temperature． The more is the Yb3 + content ， the bigger and more homogeneous is the grain size．

Meanwhile， with the Yb3 + content increasing， the thermal expansion coefficients firstly decreased and then increased．