Effects of Y2O3 addition on the phase evolution and thermophysical properties of lanthanum zirconate

Preparation and characterization of La2Zr2O7 coating with the addition of Y2O3 by EB-PVD

“…1 shows XRD patterns of LZ3Y powder annealed at 1673 K for different time. Because LZ3Y is a solid solution of Y 2 O 3 in LZ with pyrochlore structure, which is characterized by the presence of typical super-lattice peaks at 2Â values of about 14 • (1 1 1), 28 • (3 1 1), 37 • (3 3 1) and 45 • (5 1 1) using Cu K␣ radiation [11]. Its XRD pattern is very similar to that of LZ with only a small change of the lattice parameter.…”

“…LZ is composed of crystalline grains of several micrometers. LZ3Y is a composite of three phases [11], of which the fine particles (<1 m) are concentrated at boundaries of the large crystalline grains. The pattern of grain growth is probably related to the inclusion of the second phase.…”

“…Saruhan et al [4,10] confirmed that Y 2 O 3 addition in LZ could improve the chemical homogeneity of its coating. In addition, LZ ceramics doped with various Y 2 O 3 contents have been investigated in previous paper and the optimized content of 3 wt.% Y 2 O 3 as candidate for TBCs is also confirmed [11].…”

Zirconia and Pyrochlore Oxides for Thermal Barrier Coatings in Gas Turbine Engines

“…[110] Sintering can also occur in the lanthanide zirconate coatings during use. Yttria [111] and neodymium [112] doping have been shown to reduce the amount of sintering. Hafniabased coatings have also been shown to have good resistance to sintering.…”

Preparation and thermo-physical properties of La1−xNdxMgAl11O19 (x=0, 0.1, 0.2) ceramics

“…The coatings of LaMgAl 11 O 19 are sintering-resistant up to 1600 • C [10]. Although thermal conductivity of LaMgAl 11 O 19 is slightly higher than those of rare-earth zirconates [12][13][14][15][16], LaMgAl 11 O 19 shows good mechanical properties such as flexure strength, fracture toughness and elastic modulus [6][7][8][9][10]. Thermal expansion behavior of LaMgAl 11 O 19 is similar to alumina [9], which is good for the thermal expansion match and reduces the inner stress between LaMgAl 11 O 19 and thermal growth oxides (TGO).…”