Effect of processing and interface on the durability of single and bilayer 7YSZ / gadolinium zirconate EB-PVD thermal barrier coatings

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

“…Recently, a lot of studies have been conducted on new TBCs materials, such as rare‐earth‐doped zirconia, perovskite structure compounds, A 2 B 2 O 7 type pyrochlore or fluorite compounds, magnetoplumbite type hexaaluminate compounds, and garnet‐type compounds. La 2 Zr 2 O 7 , Gd 2 Zr 2 O 7 rare‐earth zirconate ceramics can significantly improve the phase transition temperature and high‐temperature thermal stability 7,8 . La 2 O 3 and CeO 2 doped in YSZ can effectively reduce the thermal conductivity 9,10 .…”

Deposition of Gadolinia-Doped Zirconia Layers Using Metalorganic Compounds at Low Temperatures

“…Gadolinium zirconate and gadolinia-doped zirconia also seem to be promising materials for applications in thermal barrier coatings (TBCs) as a top coat [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Gadolinium zirconate has very low thermal conductivity, a high melting point (above 2000 • C), and its phase transformation temperatures are higher than those of yttria-stabilized zirconia [30].…”

“…Gd 2 Zr 2 O 7 is stable at 1500-1550 • C [17,25,28]. It is also characterized by excellent chemical resistance to CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) attack [17,20,22,26,28,30]. Its disadvantage is, however, a reduced fracture toughness, which leads to easy crack formation and lower erosion resistance [25,26].…”

“…It is also characterized by excellent chemical resistance to CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) attack [17,20,22,26,28,30]. Its disadvantage is, however, a reduced fracture toughness, which leads to easy crack formation and lower erosion resistance [25,26]. However, it seems [32] that the addition of YbSZ (Yb 2 O 3 -stabilized ZrO 2 ) to Gd 2 Zr 2 O 7 could improve its fracture toughness.…”

“…However, it seems [32] that the addition of YbSZ (Yb 2 O 3 -stabilized ZrO 2 ) to Gd 2 Zr 2 O 7 could improve its fracture toughness. Gd 2 Zr 2 O 7 coatings for TBC applications are deposited mainly using methods such as atmospheric plasma spraying (APS) [16,22,27], electron beam physical vapor deposition (EB PVD), [19,24,26,28,30], or suspension plasma spraying (SPS) [20]. Attempts to obtain Gd 2 Zr 2 O 7 coatings were undertaken using the metalorganic chemical vapor deposition (MOCVD) method [17,18].…”