Correlation of Feedstock Powder Characteristics with Microstructure, Composition, and Mechanical Properties of La2Ce2O7 Coatings Produced by Plasma Spray-Physical Vapor Deposition

Zhao, Cong; He, Wenting; He, Jian; Wei, Liangliang; Guo, Hongbo

doi:10.3390/coatings10020093

Cited by 8 publications

(4 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zhang et al [22] proposed the modification of seven YSZ TBCs by adding Al to the coating, which resulted in the formation of alumina oxide particles. Zhao et al [23] developed a La2Ce2O7 coating using the PS-PVD process. The microstructure [24], deposition mechanism [25], and formation process of this type of coating was deeply investigated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Gd2Zr2O7 Coatings Using the Novel Reactive PS-PVD Process

et al. 2021

View full text Add to dashboard Cite

Ceramic topcoats of thermal barrier coatings (TBCs) make it possible to increase the working temperature of the hot sections of jet engines. Yttria-stabilized zirconia oxide (YSZ) is usually used to protect the turbine blades and vanes against high temperature and oxidation. It is necessary to develop new materials which can operate at higher temperatures in a highly oxidizing gas atmosphere. Re2Zr2O7-type pyrochlores are promising YSZ replacements. Usually, they are produced by mixing pure oxides in the calcination process at higher temperatures. In a recent article, the new concept of pyrochlore synthesis during the deposition process was presented. The new technology, called reactive plasma spray physical vapor deposition (reactive PS-PVD), was developed and a Gd2Zr2O7 (GZO) coating was achieved. The reactive PS-PVD process allowed for the use of a mixture of untreated ZrO2 and Gd2O3 powders as reactants, instead of the commercially available gadolinium zirconate powders used in other types of processes. The results of microstructure observations revealed a columnar microstructure in the produced ceramic layer. The phase composition indicated the presence of gadolinium zirconate. Thermal analysis showed a decrease in the thermal conductivity in the range of 700 to 1200 °C of the produced layers, as compared to the layer made of the currently used conventional YSZ.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Based on Refs. [23][24][25][26][27][28][29], the feedstock materials for new types of ceramic coatings were synthetized before deposition. In this paper, we present our new concept of reactive PS-PVD technology with the synthesis of materials from base oxides during the deposition process.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Gd2Zr2O7 Coatings Using the Novel Reactive PS-PVD Process

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In contrast, PS-PVD can achieve the single-phase or multiphase deposition of gas, gas–liquid, or gas–liquid–solid according to the requirements of the coating structure through parameter control, to obtain the corresponding structured coatings. PS-PVD technology enables the gasification and vapor deposition of yttria-stabilized zirconia (YSZ) powder particles at relatively low working pressures (about 100–200 Pa) and high input powers (up to 180 kW), thereby achieving feathered columnar structure coatings [ 3 ]. This technology achieves high deposition efficiency (>10 μm·min −1 ) and enables line-of-sight deposition.…”

Section: Introductionmentioning

confidence: 99%

Effect of Calcination Temperature on the Microstructure, Composition and Properties of Agglomerated Nanometer CeO2-Y2O3-ZrO2 Powders for Plasma Spray–Physical Vapor Deposition (PS-PVD) and Coatings Thereof

Hou,

Yang,

Zhan

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

Self-made agglomerated nanometer CeO2-Y2O3-ZrO2 (CYSZ) powders for plasma spray–physical vapor deposition (PS-PVD) were prepared by spray-drying, followed by calcination treatment at four different temperatures (600 °C, 700 °C, 800 °C, 900 °C). The physical properties, microstructure, and phase composition of the calcined powders were investigated using a laser particle size analyzer, scanning electron microscopy (SEM), and X-ray diffraction (XRD). The results showed that compared to the agglomerated powders obtained through spray-drying, the particle size of the agglomerated powders changed with increasing calcination temperature, accompanied by an increase in the self-bonding force of the agglomerated powder particles. The proper calcination temperature improved the sprayability of the powders. Additionally, with the increase in the calcination temperature, a transformation from the m-phase to the t-phase occurred in the powder, with Ce4+ partially entering the Zr lattice to form the t-Zr0.84Ce0.16O2 phase, which facilitated the suppression of the m-phase and improved the high-temperature phase stability. It was also found that the PS-PVD coatings prepared using the aforementioned powders exhibited coarser columnar structures with increasing powder calcination temperature.

show abstract

“…There are several studies about LC as an advanced candidate material for TBCs and a great effort has been made to improve the performance of LC TBCs. For instance, a published research work by Zhao et al [26] discussed the influence of powder characteristics on the LC coating microstructures. Wang et al [27] devoted their research to improving the thermal shock resistance and mechanical properties of LC TBC with segmented structure produced by plasma spraying.…”

Section: Introductionmentioning

confidence: 99%