Journal of Inorganic Materials

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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 Online:2009-11-20 Published:2010-04-22
  • Contact: LI Song-Lin E-mail:songlinpm@126.com

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

CLC Number: 

  • TQ174