Influence of composition on molten sulfate-vanadate salt corrosion resistance of lanthanum zirconate coatings

Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

“…In addition, there are a large number of literature reports on the corrosion performance of La 2 Zr 2 O 7 thermal barrier coatings under oxygen [9,16,20,21], molten salts or oxides (such as Na 2 SO 4 , V 2 O 5 , etc.) [4,[22][23][24], CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) [4,[25][26][27], simulated rain water after CMAS corrosion [28], and high-temperature water vapor [4,29], etc., but there are few literature reports on the corrosion performance of La 2 Zr 2 O 7 thermal barrier coating in seawater corrosive medium [30]. Considering that aircraft engines, turbines and turbine blades may be stored in a marine environment [28], it is necessary to study the corrosion resistance of La 2 Zr 2 O 7 thermal barrier coating in this case.…”

Composition‐dependent intrinsic defect structures in pyroclore RE2B2O7 (RE = La, Nd, Gd; B = Sn, Hf, Zr)

“…Lastly, the knowledge on the point defects may also guide the experimental fabrication, so as to improve the properties of the materials. For example, Liu et al synthesized the lanthanum zirconate coatings with the controllable La/Zr ratio and tailorable corrosion resistance, which is attributed to the antisite defects …”

“…For example, Liu et al synthesized the lanthanum zirconate coatings with the controllable La/Zr ratio and tailorable corrosion resistance, which is attributed to the antisite defects. 8,20,21 Numerous theoretical studies on the energetics and the stability of intrinsic point defects are performed. Using forcefield atomistic simulations, Grimes et al investigated the relationship between the structural stability of pyrochlores and their defect formation energies.…”

“…26 Similarly, the predicted low bonding and migration energies suggest the high mobility of Sn in Ti 2 SnC, 27 which assists the healing of the microstructure crack through the oxidation of Sn at temperatures below 1000°C. 28 Although there are extensive experimental and theoretical studies on defect engineering of pyrochlore oxides, [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][29][30][31][32][33] the species, formation energies, and concentrations of feasible defect complexes in stoichiometric and nonstoichiometric RE 2 B 2 O 7 remain unclear. In the present work, we systematically study the energetics and stability of charged point defect complexes in RE 2 B 2 O 7 (RE = La, Nd, Gd; B = Sn, Hf, Zr), and based on that, we propose the suggestions on the experimental fabrication and the property optimization of pyrochlores through controlling the point defects.…”

“…Although there are extensive experimental and theoretical studies on defect engineering of pyrochlore oxides, the species, formation energies, and concentrations of feasible defect complexes in stoichiometric and nonstoichiometric RE 2 B 2 O 7 remain unclear. In the present work, we systematically study the energetics and stability of charged point defect complexes in RE 2 B 2 O 7 ( RE = La, Nd, Gd; B = Sn, Hf, Zr), and based on that, we propose the suggestions on the experimental fabrication and the property optimization of pyrochlores through controlling the point defects.…”