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无机材料学报

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2009 , Vol. 24 >Issue 6: 1226 - 1230

DOI: https://doi.org/10.3724/SP.J.1077.2009.01226

研究论文

热障涂层用La2O3、Y2O3共掺杂ZrO2陶瓷粉末的制备及其相稳定性

  • 刘怀菲 ,
  • 李松林 ,
  • 李其连 ,
  • 李勇明 ,
  • 周伍喜
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  • （1. 中南大学 粉末冶金国家重点实验室, 长沙 410083; 2. 北京航空制造工程研究所, 高能束流加工技术重点实验室, 北京 100024）

收稿日期: 2009-03-02

  修回日期: 2009-06-09

  网络出版日期: 2010-04-22

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Preparation and Phase Stability of La2O3, Y2O3 Co-doped ZrO2 Ceramic
Powder Application for Thermal Barrier Coating

  • LIU Huai-Fei ,
  • LI Song-Lin ,
  • LI Qi-Lian ,
  • LI Yong-Ming ,
  • ZHOU Wu-Xi
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  • Preparation and Phase Stability of La2O3, Y2O3 Co-doped ZrO2 Ceramic
    Powder Application for Thermal Barrier Coating

Received date: 2009-03-02

  Revised date: 2009-06-09

  Online published: 2010-04-22

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摘要

采用反向化学共沉淀法制备了热障涂层用La2O3-Y2O3-ZrO2（LaYSZ）原始复合粉末, 将原始粉末团聚造粒和热处理后得到适于等离子喷涂的团聚粉末. 采用电感耦合等离子体原子发射光谱（ICP-AES）、扫描电子显微镜（SEM）、霍尔流速计、X射线衍射（XRD）等方法分别对LaYSZ的化学组成、微观形貌、流动性和松装密度、高温相稳定性进行了研究. 结果表明: LaYSZ团聚粉末室温呈四方ZrO2结构, 在1150℃热处理2h后为致密的球形或近球形颗粒, 粉末流动性较好, 适于等离子喷涂. LaYSZ团聚粉末在1300℃热处理100h后仍保持单一的四方ZrO2晶型, 而8YSZ中有12mol%的四方相转变为单斜相; LaYSZ在1400℃热处理100h后, 单斜相含量为2mol%, 而8YSZ中单斜相含量达到47mol%, 表明La2O3、 Y2O3共掺杂稳定ZrO2较单一Y2O3 稳定ZrO2具有更好的高温相稳定性.

关键词： 热障涂层; La2O3-Y2O3-ZrO2; 化学共沉淀; 相稳定性

本文引用格式

刘怀菲 , 李松林 , 李其连 , 李勇明 , 周伍喜 . 热障涂层用La2O3、Y2O3共掺杂ZrO2陶瓷粉末的制备及其相稳定性[J]. 无机材料学报, 2009 , 24(6) : 1226 -1230 . DOI: 10.3724/SP.J.1077.2009.01226

Abstract

La2O3-Y2O3-ZrO2 (LaYSZ) green composite ceramic powder was prepared by converse chemical coprecipitation method. The powder was conglomerated and heattreated to be suitable for plasma spraying. The chemical compositions, microstructures, flowability and apparent density, phase stability at high temperatures were analyzed by means of inductively coupled plasma-atomic emission spectrometre (ICP-AES), scanning electron microscope (SEM), hall flowmeter, X-ray diffraction, respectively. The results show that the green composite powder presents tetragonal ZrO2 phase structure at room temperature. After heat-treated at 1150℃ for 2h, the conglomerated powder with spherical shape and dense surface exhibits good flowability, which can be used for plasma spraying. After heat-treated at 1300℃ for 100h, LaYSZ still keeps single tetragonal ZrO2 structure, while 12mol% tetragonal phase of 8YSZ transforms to monoclinic phase. After heat-treatment at 1400℃ for 100h, the amount of monoclinic phase in LaYSZ is of 2mol%, and that in the 8YSZ is of 47mol%. It shows that La2O3, Y2O3 co-doped ZrO2 exhibits better phase stability than single Y2O3-doped ZrO2.

Key words： thermal barrier coating; La2O3-Y2O3-ZrO2; chemical coprecipitation; phase stability

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