Article ID Journal Published Year Pages File Type
1621025 Journal of Alloys and Compounds 2009 5 Pages PDF
Abstract

Lanthanum zirconate (La2Zr2O7, LZ) powders with the addition of various Y2O3 contents for potential thermal barrier coatings (TBCs) application were synthesized by solid-state reaction. The structure evolution, sintering-resistance and thermophysical properties of the synthesized powders and sintered ceramics were systematically studied. X-ray diffraction (XRD) results indicate that LZ containing 3–12 wt.% Y2O3 mainly keeps a pyrochlore-type structure, and two new phases of LaYO3 and Y0.18Zr0.82O1.91 are also detected. Raman spectra confirm that the higher the Y2O3 content, the easier is the formation of LaYO3. With the increase of Y2O3 content, the linear thermal expansion coefficients (TEC) of different La2O3–ZrO2–Y2O3 ceramics may gradually decrease. Additionally, LZ ceramics doped with 3 wt.% Y2O3 have the lowest relative density and the highest sintering-resistance among all samples, implying that it is the best candidate for TBCs among those samples in this investigation.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
Authors
, , , , , , ,