Mechanical Properties of(LaxYb1-x)2Zr2O7Thermal Barrier Coatings

Abstract:

Three different components of (La_xYb_1-x) ₂Zr₂O₇ (x = 0, 0.5, 1.0) thermal barrier coating materials were prepared by solid state synthesis method using zirconia, ytterbium oxide and lanthanum oxide. The relative theoretical densities were above 97% for all samples, which were prepared by pressureless sintering for mechanical properties test. The room temperature bending strength and high temperature Young "s modulus of the materials were tested by three-point bending method and thermomechanical analysis method respectively. The experimental results show that LaYbZr₂O₇, which is a finite solid solution consisting of La₂Zr₂O₇-based pyrochlore and Yb₂Zr₂O₇-based fluorite with fine grains, could improve room temperature bending strength compared with that of pure La₂Zr₂O₇. It also benefits the high temperature Young"s modulus above 1200℃.

Key words:thermal barrier coating;(LaxYb1-x)2Zr2O7; bending strength;high temperature Young