Effect of La2O3 on Microstructure and Thermal Conductivity of La2O3-Doped YSZ Coatings

Guo, Xiaojie; Lin, Chucheng; Zhang, Jimei; Liu, Ziwei; Jiang, Chun-Yi; Zheng, Wei; Zeng, Yi

doi:10.3390/ma12182966

Cited by 10 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…So, a good coating with fewer cracks and pores is obtained. As the RE (CeO 2 , La 2 O 3 and Y 2 O 3 ) have great chemical reactivity and bonding force with the other elements, they easily form good inter-metallic bond and compound which in contrast becomes new nuclei which enhances the nucleation rate and refines the grain near the boundaries and hence, lesser defects, cracks and pores are visible [18,22,23]. But in the coating layer without RE material, there is high surface tension, low flow rate, and the high thermal stress of molten pools which are responsible for the generation of defects [16].…”

Section: Resultsmentioning

confidence: 99%

Composite coating by TIG cladding with different rare earth oxides

Kumar

Jha

et al. 2022

Surface Engineering

View full text Add to dashboard Cite

In this study, composite coating with different rare earth oxides has been performed to enhance the surface, mechanical and tribological properties of titanium alloy using the TIG cladding process. Three different rare earth oxides, CeO 2 , La 2 O 3 and Y 2 O 3 were used in pairwise combination with WC and Ni powder. The cladding thickness, microstructure, phase analysis, microhardness and friction wear of coated samples were examined. The experimental results showed that mainly hard phases like NiTi and AlTi 2 C were found in coatings. The sample prepared with RE oxides refines the coating grains and enhances the mechanical and tribological properties. The wear test analysis reveals a considerable decrease in coefficient of friction (COF). The mechanism for the wear of coating was adhesion. The coating done with CeO 2 and La 2 O 3 has the highest microhardness (870 HV 0.5 ) and wear resistance (COF of 0.22), which confirmed that this combination of RE oxide is appropriate for surface modification.

show abstract

Section: Resultsmentioning

confidence: 99%

Composite coating by TIG cladding with different rare earth oxides

Kumar

Jha

et al. 2022

Surface Engineering

View full text Add to dashboard Cite

show abstract

“…The phase changes during the reaction can lead to concentrated thermal stresses within the coating, triggering premature coating failure [17]. Therefore, modifying YSZ with rare earth oxides such as La 2 O 3 , Sc 2 O 3 , Gd 2 O 3 , Yb 2 O 3 , and CeO 2 has become a focal point of current research [18][19][20][21][22][23]. Studies indicate that doping YSZ with CeO 2 enhances the coating's thermal expansion coefficient, strain tolerance, and thermal cycle lifespan.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation Resistance and Molten Salt Corrosion Study of YSZ, CeYSZ, and YSZ/CeYSZ Thermal Barrier Coatings by Atmospheric Plasma Spraying

Li,

Xing,

et al. 2024

Coatings

View full text Add to dashboard Cite

Five thermal barrier coatings (TBCs), namely TBC-1 (YSZ), TBC-2 (CeYSZ), TBC-3 (YSZ:CeYSZ = 1:2), TBC-4 (YSZ:CeYSZ = 1:1), and TBC-5 (YSZ:CeYSZ = 2:1), were fabricated using the atmospheric plasma spraying (APS) method. Their oxidation behaviors at 1100 °C and corrosion resistance to molten salts (V2O5 + Na2SO4) at 900 °C were examined. After 100 h of oxidation, the thermally grown oxide layer (TGO) for YSZ primarily contained Cr and Ni oxides with significant internal fractures, presenting a continuous band-like Al2O3. In dual-ceramic configurations, an increase in CeYSZ thickness led to a rise in Al content and reduced Cr and Ni in TGO, with the surface fracture morphing into an internal porosity. Following salt corrosion, YSZ revealed rod-like YVO4 and m-ZrO2 as corrosion products, whereas CeYSZ displayed chain-structured CeO2, CeYO4, and YVO4 combined with m-ZrO2. YSZ coatings underwent notable phase transitions with evident densification, forming a corrosion layer of approximately 10 μm. Conversely, CeYSZ showed a limited phase change, retaining porosity without a distinguishable corrosion layer. As CeYSZ thickness increased from 100 μm to 200 μm in the dual-ceramic structure, salt penetration reduced. Evidently, the dense structure of CeYSZ heightened diffusion resistance against oxygen and corrosive salts, rendering superior oxidation and corrosion resistance over YSZ. By optimizing the thickness ratio between CeYSZ and YSZ, whilst retaining total ceramic layer thickness, the dual-ceramic TBC’s resistance to high-temperature oxidation and corrosion can be enhanced.

show abstract

“…It should be stressed that yttria-stabilized zirconia (YSZ) and it is modifications (such as YSZ-Nd, YSZ-Gd) have never been used in the studies of adsorption processes. The powders of the ZrO 2 -Y 2 O 3 -Me 2 O 3 system (Me = Sm, Nd, Gd, La) were manufactured by various methods such as co-precipitation and calcination, atmospheric plasma spraying [38,39,40,41] and by crystallization of the zirconia solid solution under hydrothermal conditions. The later process allows to obtain isometric crystallites of nanometric size [37,42].…”

Section: Introductionmentioning

confidence: 99%

Nanopowders of Yttria-Stabilized Zirconia Doped with Rare Earth Elements as Adsorbents of Humic Acids

et al. 2019

View full text Add to dashboard Cite

The aim of the investigations was to use, for the first time, zirconia nanopowders stabilized with yttria (YSZ) and rare element oxides (YSZ-Nd, YSZ-Gd) for removal of humic acids (HA) from aqueous solutions. Nanopowders were synthesized by means of hydrothermal crystallization and characterized using scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) methods and analysis of zeta potential. The adsorption processes analysis was carried out in a series of experiments depending on: initial concentration of humic acids, contact time, pH and mass of the used adsorbent. It was found, that the YSZ-Nd exhibits strong and much higher effectiveness of HA adsorption than YSZ and YSZ-Gd. The HA adsorption rate reached 96.8% for YSZ-Nd dosage of 100 mg, pH 4, and 15 min reaction time and for HA initial concentration equal to 25 mg/L. According to the Langmuir model simulation, the maximum adsorption capacity of HA on YSZ-Nd at pH 4 was calculated to be 2.95 mg/g. Changes in the FT-IR spectra of YSZ-Nd confirmed humic acids’ adsorption on the tested nanopowders, by the presence of additional bands representing carboxylic, alcohol, carbonyl and amino groups in humic acid structure. These functional groups could represent humic acids binding on the YSZ, YSZ-Nd or YSZ-Gd surfaces.

show abstract

Effect of La2O3 on Microstructure and Thermal Conductivity of La2O3-Doped YSZ Coatings

Cited by 10 publications

References 21 publications

Composite coating by TIG cladding with different rare earth oxides

Composite coating by TIG cladding with different rare earth oxides

High-Temperature Oxidation Resistance and Molten Salt Corrosion Study of YSZ, CeYSZ, and YSZ/CeYSZ Thermal Barrier Coatings by Atmospheric Plasma Spraying

Nanopowders of Yttria-Stabilized Zirconia Doped with Rare Earth Elements as Adsorbents of Humic Acids

Contact Info

Product

Resources

About