scholarly journals Investigating the in-flight droplets' atomization in suspension plasma-sprayed coating

2022 ◽  
Vol 182 ◽  
pp. 121969
Author(s):  
E. Dalir ◽  
A. Dolatabadi ◽  
J. Mostaghimi
Keyword(s):  
Sprayed Coating ◽  
Plasma Sprayed

Investigations of the Fracture of Composites Matrix-Coating Under Tension

1998 ◽  
Author(s):  
V.E. Panin ◽  
V.A. Klimenov ◽  
S.V. Panin
Keyword(s):  
Steel Matrix ◽  
Matrix Composites ◽  
Coating Quality ◽  
Deformation Stages ◽  
The Matrix ◽  
Sprayed Coating ◽  
Plasma Sprayed

Abstract Deformation stages and specific features were studied by mesomechanical methods under tension of plasma sprayed coating-steel matrix composites. The effect of coating quality on the deformation of the matrix at the mesolevel was revealed. The results obtained make it possible to predict reliability and durability of this kind of coating and of the entire composite.

Sealing Treatment of Plasma Sprayed Cr3C2-NiCr/Al2O3-TiO2 Coating by Aluminum Phosphate Sealant Containing Al2O3 Nanoparticles

2021 ◽  
Author(s):  
Tuan Nguyen Van ◽  
Tuan Anh Nguyen ◽  
Ha Pham Thi ◽  
Ly Pham Thi ◽  
Phuong Nguyen ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Aluminum Phosphate ◽  
Al2o3 Nanoparticles ◽  
Treatment Efficiency ◽  
Typical Structure ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Sealing Treatment ◽  
Sprayed Coatings

Abstract A typical structure of thermal spray coatings consisted of molten particles, semi-molten particles, oxides, pores and cracks. These factors caused the porosity of sprayed coatings, leading to a great influence on the coating properties, especially their wear-corrosion resistance. In this study, a post-spray sealing treatment of Cr3C2-NiCr/Al2O3-TiO2 plasma sprayed coatings was carried out, then their corrosion properties were evaluated, before and after the treatment. For sealing process, aluminum phosphate (APP) containing aluminum oxide (Al2O3) nanoparticles (~10 nm) was used. The permeability of APP into the sprayed coating was analyzed by scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS). The treatment efficiency for porosity and corrosion resistance of sprayed coatings were evaluated by electrochemical measurements, such as the potentiodynamic polarization and electrochemical impedance spectroscopy. In addition, the wear-corrosion resistance of the sealed coating was examined in 3.5 wt.% NaCl circulation solution containing 0.25 wt.% SiO2 particles. The obtained results showed that APP penetrated deeply through the sprayed coating. The incorporation of Al2O3 nanoparticles into APP sealant enhanced the treatment efficiency of porosity for sprayed coating. The effect of the post-treatment on corrosion protection of the sprayed coating has been discussed.

scholarly journals Comparison of Physical-chemical and Mechanical Properties of Chlorapatite and Hydroxyapatite Plasma Sprayed Coatings

2015 ◽  
Vol 9 (1) ◽  
pp. 42-55 ◽  
Author(s):  
Imane Demnati ◽  
David Grossin ◽  
Olivier Marsan ◽  
Ghislaine Bertrand ◽  
Gérard Collonges ◽  
...  
Keyword(s):  
Side Reaction ◽  
Processing Parameters ◽  
X Ray Diffraction ◽  
Unexpected Formation ◽  
Monoclinic Form ◽  
Ion Exchange Reaction ◽  
Physical Chemical ◽  
Distribution Mapping ◽  
Sprayed Coating ◽  
Plasma Sprayed

Chlorapatite can be considered a potential biomaterial for orthopaedic applications. Its use as plasma-sprayed coating could be of interest considering its thermal properties and particularly its ability to melt without decomposition unlike hydroxyapatite. Chlorapatite (ClA) was synthesized by a high-temperature ion exchange reaction starting from commercial stoichiometric hydroxyapatites (HA). The ClA powder showed similar characteristics as the original industrial HA powder, and was obtained in the monoclinic form. The HA and ClA powders were plasma-sprayed using a low-energy plasma spraying system with identical processing parameters. The coatings were characterized by physical-chemical methods, i.e. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy, including distribution mapping of the main phases detected such as amorphous calcium phosphate (ACP), oxyapatite (OA), and HA or ClA. The unexpected formation of oxyapatite in ClA coatings was assigned to a side reaction with contaminating oxygenated species (O2, H2O). ClA coatings exhibited characteristics different from HA, showing a lower content of oxyapatite and amorphous phase. Although their adhesion strength was found to be lower than that of HA coatings, their application could be an interesting alternative, offering, in particular, a larger range of spraying conditions without formation of massive impurities.

scholarly journals Transient Phenomena in Plasma Torches and in Plasma Sprayed Coating Generation

1997 ◽  
Vol 07 (C4) ◽  
pp. C4-187-C4-198 ◽  
Author(s):  
P. Fauchais ◽  
J. F. Coudert ◽  
M. Vardelle
Keyword(s):  
Transient Phenomena ◽  
Plasma Torches ◽  
Sprayed Coating ◽  
Plasma Sprayed

Surface integrity design of plasma sprayed coating for resisting contact fatigue

2016 ◽  
Vol 179 ◽  
pp. 174-181 ◽  
Author(s):  
Piao Zhong-yu ◽  
Xu Jia ◽  
Yin Lin-zhi ◽  
Wen Dong-hui ◽  
Xu Bin-shi ◽  
...  
Keyword(s):  
Surface Integrity ◽  
Contact Fatigue ◽  
Sprayed Coating ◽  
Plasma Sprayed

Effect of YSZ-dopant on microstructure and hardness property of the Al2O3–40%TiO2 plasma sprayed coating

2018 ◽  
Vol 5 (8) ◽  
pp. 086504 ◽  
Author(s):  
Kunlun Chen ◽  
Peng Song ◽  
Chen Hua ◽  
Ying Zhou ◽  
Taihong Huang ◽  
...  
Keyword(s):  
Hardness Property ◽  
Sprayed Coating ◽  
Plasma Sprayed

PLASMA SPRAYED COATING MATERIALS

1986 ◽  
pp. 533-541
Author(s):  
Ding Chuanxian ◽  
Huang Bingtang ◽  
Lin Huiling
Keyword(s):  
Coating Materials ◽  
Sprayed Coating ◽  
Plasma Sprayed

Ion-Plasma Sprayed Coating as a Protective Decorative Coating for Copper-Nickel Alloy

2018 ◽  
Vol 284 ◽  
pp. 1195-1199
Author(s):  
Vladislav R. Baraz ◽  
S.S. Gerasimov ◽  
I.A. Gruzdeva
Keyword(s):  
Nickel Alloy ◽  
Nitride Layer ◽  
Zirconium Nitride ◽  
Nitride Coating ◽  
Decorative Coating ◽  
Copper Nickel ◽  
Ion Plasma ◽  
Copper Nickel Alloy ◽  
Sprayed Coating ◽  
Plasma Sprayed

This article is devoted to studiing the ion-plasma sprayed coating on the surface of copper-nickel alloy obtained by complex titanium nitride and zirconium nitride treatment. To evaluate the coating microhardness we use the method that provides the obligatory penetration of diamond-pointed pyramid through nitride layer. It is shown that nitride coating microhardness is much higher than the copper-nickel alloy microhardness. Furthermore, surface treatment provides the color of the nitride coating just as gold plated.

The evaluation of microstructure characteristic and corrosion performance of laser-re-melted Fe-based amorphous coating deposited via plasma spraying

2019 ◽  
Vol 9 (9) ◽  
pp. 1100-1105
Author(s):  
Xiao-Lin Zhang ◽  
Chao-Ping Jiang ◽  
Feng-Ying Zhang ◽  
Ya-Zhe Xing
Keyword(s):  
Carbon Steel ◽  
Laser Energy ◽  
Melting Process ◽  
Corrosion Property ◽  
Amorphous Coating ◽  
Corrosion Performance ◽  
X Ray Diffraction ◽  
Porosity Ratio ◽  
Sprayed Coating ◽  
Plasma Sprayed

The laser re-melting treatment was performed on the plasma-sprayed Fe-based amorphous coating to ameliorate the corrosion performance of the coating. The re-melting depth was about 200 μm which was mainly controlled by laser energy input, beam speed and facular dimension. The microstructure was characterized by scanning electron microscope (SEM), and X-ray diffraction (XRD). The corrosion property of the coatings was addressed via electrochemistry methods in a 3.5 wt.% NaCl solution. The results indicate that the plasma-sprayed coating becomes much denser after laser re-melting treatment. The connected porosity ratio in as-sprayed coating dramatically reduces from 16.3% to 2.4% after laser re-melting. The as-sprayed coating mainly contains amorphous and much limited crystal phase, and some amorphous phase in the as-sprayed coating crystalizes during laser re-melting. Polarization test demonstrated that the as-sprayed coating has a significantly dramatical effect for improving corrosion performance of carbon steel, while the laser re-melting process is a more efficient method. The influence level of the coating compactness in this study is roughly two times as big as that of amorphous in coating, in the term of improving corrosion resistance of carbon steel.

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