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无机材料学报

无机材料学报

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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1, 2, 李松林1, 李其连2, 李勇明1, 周伍喜1   

  1. （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 出版日期:2009-11-20 网络出版日期:2010-04-22

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

LIU Huai-Fei1,2, LI Song-Lin1, LI Qi-Lian2, LI Yong-Ming1, ZHOU Wu-Xi1   

  1. Preparation and Phase Stability of La2O3, Y2O3 Co-doped ZrO2 Ceramic
    Powder Application for Thermal Barrier Coating
  • Received:2009-03-02 Revised:2009-06-09 Published:2009-11-20 Online:2010-04-22

PDF (PC)

1637

被引次数

5

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

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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