摘要
采用高温固相反应合成法制备不同组分的铈掺杂Y_3Al_5O_(12)热障涂层陶瓷材料,利用X射线衍射仪、X射线光电子能谱、扫描电子显微镜、维氏硬度仪和激光导热仪研究Ce掺杂量对陶瓷材料物相组成、微观形貌、硬度和热导率的影响规律。结果表明:当Ce掺杂量x为0.01和0.02时,(Y_(1-x)Ce_x)_(3)Al_(5)O_(12)呈单一YAG相,(Y_(0.99)Ce_(0.01))_(3)Al_(5)O_(12)的硬度最大,约为18.93 GPa;(Y_(0.98)Ce_(0.02))_(3)Al_(5)O_(12)的热导率最低,1000℃时约为1.95W·m^(-1)·K^(-1)。随着Ce掺杂量的增加,材料中出现Ce O_(2)第二相且Ce~(4+)的占比增多,粉体颗粒尺寸增大,陶瓷晶粒尺寸减小,导致(Y_(1-x)Ce_x)_(3)Al_(5)O_(12)陶瓷材料的硬度和热导率均有所下降。
Ce doped Y_(3)Al_(5)O_(12)thermal barrier coating ceramic materials with different components were prepared by high temperature solid-state reaction synthesis method.The effects of Ce doping amount on phase composition,microstructure,hardness and thermal conductivity of the ceramic materials were studied by X-ray diffraction,X-ray photoelectron spectroscopy,scanning electron microscopy,a Vickers hardness tester and a laser thermal conductivity tester.The results show that(Y_(1-x)Ce_(x))3Al_(5)O_(12)presents a single YAG phase when the Ce content x equals to 0.01 or 0.02.The hardness of(Y_(0.99)Ce_(0.01))_(3)Al_(5)O_(12)is the highest(~18.93 GPa)and the thermal conductivity of(Y_(0.98)Ce_(0.02))_(3)Al_(5)O_(12)is the lowest(~1.95 W·(m·K)^(-1),1000℃).With the increase of Ce doping amount,the second phase of CeO_(2) appears in the(Y1-xCex)3Al_(5)O_(12)and the proportion of Ce4+ions increases,meanwhile,the particle size of the powders increases and the grain size of the ceramics decreases,thus the hardness and the thermal conductivity of material decrease.
作者
王炫力
刘爽
谢敏
王志刚
牟仁德
宋希文
Wang Xuanli;Liu Suang;Xie Min;Wang Zhigang;Mu Rende;Song Xiwen(School of Maerials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China;AECC Beijing Institute of Aeronautial Materials,Beijing 100095,China)
出处
《中国稀土学报》
EI
CAS
CSCD
北大核心
2023年第6期1119-1125,I0003,共8页
Journal of the Chinese Society of Rare Earths
基金
国家科技重大专项项目(J2019-VI-0002-0115)
国家自然科学基金青年科学基金项目(52002124)
内蒙古自治区自然科学基金(2020LH05028)
内蒙古科技大学创新基金项目(2019QDL-B03)资助。
关键词
热障涂层
陶瓷层材料
钇铝石榴石
铈掺杂
硬度
热导率
thermal barrier coating
ceramic layer material
yttrium aluminum garnet
Cerium doping,hardness
thermal conductivity
