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Journal of Inorganic Materials

Journal of Inorganic Materials >

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

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

Research Paper

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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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

Cite this article

LIU Huai-Fei , LI Song-Lin , LI Qi-Lian , LI Yong-Ming , ZHOU Wu-Xi . Preparation and Phase Stability of La2O3, Y2O3 Co-doped ZrO2 Ceramic
Powder Application for Thermal Barrier Coating[J]. Journal of Inorganic Materials, 2009 , 24(6) : 1226 -1230 . DOI: 10.3724/SP.J.1077.2009.01226

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