Microstructure and Nanomechanical Property of Plasma-Sprayed Nanostructured Yb2SiO5 Environmental Barrier Coatings

2021 ◽  
Author(s):  
Tao Zheng ◽  
Baosheng Xu ◽  
Shun Wang ◽  
Donghui Guo ◽  
Feifei Zhou ◽  
...  
Keyword(s):  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Nanomechanical Property ◽  
Distribution Analysis ◽  
X Ray Diffraction ◽  
Barrier Coatings ◽  
Environmental Barrier Coatings ◽  
X Ray ◽  
Nano Indentation ◽  
Plasma Sprayed

Abstract In this study, nanostructured Yb2SiO5 coatings were prepared by atmospheric plasma spraying (APS) using nanostructured Yb2SiO5 feedstocks. Conventional Yb2SiO5 coatings were selected for comparison. The microstructure and nanomechanical property of the nanostructured and conventional Yb2SiO5 coatings were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and nano-indentation. Results indicate that the surface of the nanostructured Yb2SiO5 coatings is uniform and denser than the conventional Yb2SiO5 coatings. In addition, Weibull distribution analysis shows that the molten state of the nanostructured Yb2SiO5 coatings present a mono-modal distribution, whereas the conventional Yb2SiO5 coatings show a bi-modal distribution, i.e. molten and unmelted zones. The nanostructured Yb2SiO5 coatings have a higher elastic modulus than the conventional Yb2SiO5 coatings (167.37077 ± 16.88070 GPa versus 153.72856 ± 19.69907 GPa), reflecting their high density.

Microstructure and Corrosion Resistance of Fe-Based Amorphous Coating Prepared Atmospheric Plasma Spraying

2012 ◽  
Vol 557-559 ◽  
pp. 1768-1771
Author(s):  
Xiao Bing Zhao ◽  
Zhi Hui Ye
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Plasma Spraying ◽  
Amorphous Powder ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Amorphous Coating ◽  
X Ray Diffraction ◽  
X Ray ◽  
Steel Substrates

Fe-based amorphous coating was prepared on stainless steel substrates by atmospheric plasma spraying (APS) using Fe-based amorphous powder as feedstock. Microstructures of the coating were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM). The corrosion behavior of coating and stainless steel were evaluated respectively in 3.5% NaCl, 10% NaOH and 1 mol/L H2SO4 aqueous solutions by electrochemical workstation. The results indicated that the coating was composed of most amorphous phase and some Fe-Cr crystalline phase. The coating exhibited the better corrosion resistance in H2SO4 solution, while the worse in NaOH.

Ablation Behavior of HfC Coating Prepared by Supersonic Plasma Spraying for SiC-Coated C/C Composites

2015 ◽  
Vol 24 (5) ◽  
pp. 096369351502400 ◽  
Author(s):  
Yang Yang ◽  
Kezhi Li ◽  
Hejun Li
Keyword(s):  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
X Ray Diffraction ◽  
Dense Structure ◽  
X Ray ◽  
Ablation Resistance ◽  
Supersonic Plasma ◽  
Centre Region ◽  
Supersonic Atmospheric Plasma Spraying

In order to improve the ablation resistance of C/C composites HfC coating was deposited on the surface of SiC-coated C/C composites by supersonic atmospheric plasma spraying. The microstructure and morphology of the different coatings were characterized by Scanning Electron Microscopy, X-ray diffraction. The ablation test of samples was carried out with an oxyacetylene torch. The coating exhibits dense structure and good ablation resistance. After ablation for 30s, the linear and mass ablation rates of the coating are 0.59 μm/s and 0.6 mg/s, respectively. In ablation centre region, a HfO2 layer is formed on the surface of sample after 30s ablation, and it can protect C/C composites from ablation.

A Comparison between Hardness, Corrosion and Wear Performance of APS Sprayed WC-CoMo and WC-Co Coatings

2016 ◽  
Vol 254 ◽  
pp. 71-76 ◽  
Author(s):  
Norbert Kazamer ◽  
Dragos Toader Pascal ◽  
Gabriela Marginean ◽  
Viorel Aurel Şerban ◽  
Cosmin Codrean ◽  
...  
Keyword(s):  
Wear Behavior ◽  
Atmospheric Plasma ◽  
The Novel ◽  
X Ray Diffraction ◽  
Wear Performance ◽  
X Ray ◽  
Wear And Corrosion ◽  
Coating Characteristics ◽  
Hazardous Element ◽  
Plasma Sprayed

In order to be competitive, it is demanded to have thin, tough and long lasting coatings. An important aspect is to use stable deposition technologies. As Cr assures wear, corrosion and high temperature resistance, the most employed coatings in industry generally contain Cr. Nevertheless, Cr is a hazardous element for the humans’ health, therefore, sustainable alternatives are needed to be implemented. The aim of this work is to investigate the microstructure, hardness, corrosion resistance and wear behavior of the novel WC-CoMo compared to conventional WC-Co coatings. So far, WC-CoMo coatings are not part of state of the art regarding the Atmospheric Plasma Sprayed (APS) coatings. WC-Co powder in plain form and mechanically mixed with Mo was deposited using the APS method on standardized Type A Almen Strips (C67 steel). The size of the powder grains varies between 5 µm and 30 µm. The obtained samples were investigated by means of Scanning Electron Microscopy, Energy Dispersive X-Ray Spectroscopy, X-Ray Diffraction, and hardness, wear and corrosion behavior were also evaluated. Results revealed formation of different intermetallic phases around the WC particles, which have a benefic influence on the coating characteristics and microstructure.

Neutron and X-ray diffraction of plasma-sprayed zirconia-yttria thermal barrier coatings

1984 ◽  
Vol 119 (2) ◽  
pp. 159-171 ◽  
Author(s):  
N.R. Shankar ◽  
H. Herman ◽  
S.P. Singhal ◽  
C.C. Berndt
Keyword(s):  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
X Ray Diffraction ◽  
Barrier Coatings ◽  
X Ray ◽  
Plasma Sprayed

Evaluation of Microstructure, Phase Composition and Hardness of Alternative Abradable Ceramic Coating Systems Produced by Means of Atmospheric Plasma Spraying

2019 ◽  
Vol 296 ◽  
pp. 161-166
Author(s):  
David Jech ◽  
Michaela Remešová ◽  
Pavel Komarov ◽  
Serhii Tkachenko ◽  
Zdeněk Česánek ◽  
...  
Keyword(s):  
Phase Composition ◽  
Solid Lubricant ◽  
Atmospheric Plasma ◽  
X Ray Diffraction ◽  
X Ray ◽  
Abradable Coating ◽  
Basic Parameters ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Abradable Coatings

Only a few types of commercially available high temperature ceramic abradable coatings are presented on the market and most of them consist of partially stabilized yttria zirconia with polymer porosity former agent and/or hBN solid lubricant. The basic demand placed on abradable coatings include balance between hardness and erosion resistance. The contribution focuses on the description of microstructure, phase composition and hardness of alternative atmospheric plasma sprayed ceramic abradable coatings deposited from four different experimental powder mixtures: (i) commercial yttria-zirconia + 5 wt. % of experimental BaF2/CaF2, (ii) commercial yttria stabilized zirconia + 10 wt. % of experimental BaF2/CaF2, (iii) R&D powder SrxTiOy and (iv) R&D powder SrxTiOy + 5 wt. % of polyester. The abradable coating systems were of ~ 150 μm thick CoNiCrAlY bond coat and of ~ 800-1000 μm thick ceramic top coat. The microstructure and phase composition of all atmospheric plasma sprayed coating systems were evaluated by the means of scanning electron microscopy and X-ray diffraction techniques. To estimate coatings basic parameters the Rockwell hardness HR15Y was measured.

Structure and Electrochemical Behavior of Plasma-Sprayed LSGM Electrolyte Films

2002 ◽  
Vol 756 ◽  
Author(s):  
H. Zhang ◽  
X. Ma ◽  
J. Dai ◽  
S. Hui ◽  
J. Roth ◽  
...  
Keyword(s):  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
Amorphous Structure ◽  
Solid Oxide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spray Process ◽  
Plasma Spray Process ◽  
Electrolyte Film ◽  
Plasma Sprayed

ABSTRACTAn intermediate temperature solid oxide fuel cell (SOFC) electrolyte film of La0.8Sr 0.2Ga0.8Mg0.2O2.8 (LSGM) was fabricated using a plasma spray process. The microstructure and phase were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical behavior of the thermal sprayed LSGM film was investigated using electrochemical impedance spectroscopy (EIS). The study indicates that thermal spray can deposit a dense LSGM layer. It was found that the rapid cooling in the thermal process led to an amorphous or poor crystalline LSGM deposited layer. This amorphous structure has a significant effect on the performance of the cell. Crystallization of the deposited LSGM layer was observed during annealing between 500–600 °C. After annealing at 800 °C, the ionic conductivity of the sprayed LSGM layer can reach the same level as that of the sintered LSGM.

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