Phase relations and thermomechanical properties of (Gd2Zr2O7)1−x(YbSZ)x based thermal barrier coatings (0 ≤ x ≤ 0.98)

Abstract Doped Gd 2 Zr O 7 materials have interesting properties as thermal barrier coatings (TBC) to replace the YSZ topcoats traditionally used. Here we investigate thermomechanical and phase relations of (GZO) alloyed with 5 mol% Yb 3 stabilized ZrO (YbSZ) in composition range (Gd ) 1− x , 0 ≤ 0.98. With increasing YbSZ content, transformations from ordered disordered pyrochlore fluorite tetragonal structures were observed. The expansion coefficient (TEC) Vickers hardness correlated showing a maximum (~ 11.5 GPa) minimum TEC at = 0.82. At 1000 °C, for end members, 0.98, 11.4 11.3 × 10 –6 K −1 respectively. fracture toughness, IC showed an average value around 1.5 MPa m 0.5 0.93 increased significantly 0.98 reaching 5.4 due presence ferroelastic phase. For TBC applications, compounds show promise high . Graphic abstract Fig. 5a summarize most important results manuscript. Showing significant increase toughness compositions x=0.98.