Failure of Gadolinium Zirconate and Yttria Stabilized Zirconia Thermal Barrier Coatings Subjected to High Temperature Calcia-Magnesia-Alumino-Silicate Attack

Čelko, Ladislav; Jech, David; Tkachenko, Serhii; Komarov, Pavel; Remešová, Michaela; Slámečka, Karel; Ctibor, Pavel

doi:10.1016/j.prostr.2020.01.113

Cited by 4 publications

(3 citation statements)

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“…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].…”

Section: Introductionmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

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

Sawka

2021

Materials

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This paper shows the results of an investigation on the synthesis of non-porous and nanocrystalline ZrO2-Gd2O3 layers by metalorganic chemical vapor deposition (MOCVD) with the use of Zr(tmhd)4 (tetrakis(2,2,6,6-tetramethyl-3,5-heptanedionato)zirconium(IV)) and Gd(tmhd)3 (tris(2,2,6,6-tetramethyl-3,5-heptanedionato)gadolinium(III)). Argon and air were used as carrier gases. The molar content of Gd(tmhd)3 in the gas reaction mixture was as follows: 10% and 20%. The layers were synthesized on tubular substrates made of quartz glass at the temperatures of 550–700 °C. Synthesis conditions were established using the Grx/Rex2 expression (Gr is the Grashof number; Re is the Reynolds number; x is the distance from the gas inflow point). The value of this criterion was below 0.01. ZrO2-Gd2O3 layers synthesized at 600–700 °C were crystalline. When the molar content of Gd(tmhd)3 in the gas reaction mixture was 10 mol.%, a relationship between the chemical composition of the gas reaction mixture and that of the deposited layer could be observed. The synthesized layers underwent scanning electron microscopy, as well as X-ray analysis. The transparency of coated and uncoated glass was tested using UV–Vis spectroscopy. Their chemical composition was examined with the use of an EDS analyzer.

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