Effects of Ta₂O₅ content on mechanical properties and high‐temperature performance of Zr₆Ta₂O₁₇ thermal barrier coatings

Abstract

Zr6Ta2O17/YSZ double ceramic top coat thermal barrier coatings (TBCs) with different Ta2O5 content are prepared by atmospheric plasma spraying (APS). The effects of Ta2O5 content on mechanical properties and high‐temperature performance of Zr6Ta2O17 TBCs are investigated. With the decrease in Ta2O5 content, the hardness and fracture toughness of the Zr6Ta2O17 coating increases from 12.833 to 15.117 GPa and from 3.3592 to 3.7753 MPa m1/2, respectively. The Zr6Ta2O17 coating specimens with different Ta2O5 content do not delaminate from the substrate except the edge peeling after 180 h of oxidation or 2000 thermal cycles at 1150°C. The Zr‐12Ta specimen (the molar ratio of ZrO2/Ta2O5 of 0.88:0.12) presents the more excellent mechanical properties and high‐temperature performance. The reduction in Ta2O5 content will improve the mechanical properties, high‐temperature oxidation, and thermal cycle performance of Zr6Ta2O17/YSZ double ceramic top coat TBCs.

CMAS Corrosion Resistance Behavior and Mechanism of Hf6Ta2O17 Ceramic as Potential Material for Thermal Barrier Coatings

“…However, they still cannot replace the traditional 8YSZ TBCs due to their mismatched thermal expansion coefficients [18] and insufficient comprehensive performance of thermal and mechanical properties [19,20]. Hf 6 Ta 2 O 17 ceramic material with A 6 B 2 O 17 (A = Hf, Zr, B = Ta, Nb) superstructure crystal can solve the above problems effectively [21,22]. Hf 6 Ta 2 O 17 ceramic has a sufficiently large synthesis range, superior phase stability and excellent thermal properties [23][24][25].…”

Charge Transport in the A6B2O17 (A = Zr, Hf; B = Nb, Ta) Superstructure Series

“…So far, mainly structural and thermodynamic properties of A 6 B 2 O 17 (A = Zr, Hf, B = Nb, Ta) have been studied. [2][3][4][5][6][7] The orthorhombic unit cell of A 6 B 2 O 17 the compounds is a commensurate superlattice structure built using three distinctive distorted polyhedra, with coordination numbers of six, seven, and eight. Cation-oxygen bond lengths in all four oxides are similar regardless of cation and polyhedron coordination.…”