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1222 |
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Development of nanostructured lanthanum zirconate coating
and its thermal stability properties |
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Xiaodong Zhao* / Beijing General Research Institute of Mining and Metallurgy, P.R.Chin ZENG Ke-Li / Beijing General Research Institute of Mining and Metallurgy, P.R.China ZHAO Xiao-Dong/ Beijing General Research Institute of Mining and Metallurgy, P.R.China XIE Jian-Gang/ Beijing General Research Institute of Mining and Metallurgy, P.R.China Ren Xian-Jing/ Beijing General Research Institute of Mining and Metallurgy, P.R.China YU Yueguang/ Beijing General Research Institute of Mining and Metallurgy, P.R.China |
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In this paper, nano-La2Zr2O7 thermal barrier coatings (MCrAlY+ La2Zr2O7) were prepared by atmospheric plasma sprayed (APS). The microstructures and thermal stability properties were systematically studied to compare with their conventional counterparts by Scanning Electric Microscopy (SEM)?Atransmission electron microscope (TEM) and X-Ray diffraction(XRD). The results showed that the nanostructured lanthanum zirconate coatings were typical lamellar structure which was composed of columnar grains about 90nm in diameter. A large quantity of micro-cracks and homogeneous distributed fine pores formed in the nanostructured zirconia coating. After ablation at 1300?? for 24 h, no apparent phase transformation was observed in lanthanum zirconate coating. The growth mechanism of the grains was subsequently discussed. |