Characterization of Erosion Resistant Cr3C2-NiCr Plasma Sprayed Coatings

1996 ◽  
Author(s):  
D.-Y. Kim ◽  
M.-S. Han ◽  
J.-G. Youn
Keyword(s):  
Heat Treatment ◽  
Erosion Resistance ◽  
Process Variables ◽  
Graphite Phase ◽  
Plasma Sprayed Coatings ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Abstract Properties of an erosion resistant Cr3C2 - NiCr coating have been studied as a function of both plasma spraying process variables and heat treatment. The as-sprayed Cr3C2 - NiCr coating revealed low hardness value of 380-470 Hv, which provided the coating with a poor erosion resistance. This is directly attributed to the decomposition of Cr3C2 constituent into Cr7C3 and graphite phases during the spraying. It was not the effective way to control the process variables such as arc current and stand-off distance for preventing the decomposition of Cr3C2 constituent. A proper heat treatment on the as-sprayed coating increases the hardness of the coating in a great extent up to 900Hv so that the erosion resistance of the coating is clearly improved. This was confirmed to be attributed to the recovery of Cr3C2 at the expense of graphite phase and the formation of Cr2O3 by the heat treatment. In addition, the formation of Cr2O3 phase plays an important role of increasing the erosion resistance of the coating by healing the microcracks of the as-sprayed coating. These are the microstructural features responsible for the high erosion resistance of the coating after a proper heat treatment.

Preparation and Characterization of Ni-Al-Cr3C2 Coating

2008 ◽  
Vol 373-374 ◽  
pp. 15-18 ◽  
Author(s):  
Ling Zhong Du ◽  
Wei Gang Zhang ◽  
Deng Jun Zhang ◽  
Bao Hou Li
Keyword(s):  
Bonding Strength ◽  
Wear Properties ◽  
Exothermal Reaction ◽  
Plasma Sprayed Coatings ◽  
Machine Parts ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
1045 Steel ◽  
Sprayed Coatings

In order to improve the surface properties of the machine parts, the NiAl cladding Cr3C2 powder were flame and plasma sprayed. The morphology, microstructure, composition and wear properties of the coatings were examined. The results show that due to the exothermal reaction of the Ni and Al elements, the bonding strength of the coatings are improved, and the main compositions of the coatings are Ni3Al inter-metallic compound and Cr3C2. The flame sprayed and plasma sprayed coatings show almost the same micro-hardness and friction coefficient. But the microstructure of the plasma sprayed coating is more compact than that of the frame sprayed one and the wear resistance of the flame and sprayed coatings is 30% and 120% higher than that of the 1045 steel, respectively. The main wear mechanisms of the coatings are plastic deformation and spallation, and the high bonding strength and the uniformly distributed Cr3C2 particles play important anti-wear roles.

CHARACTERIZATION OF AS-SPRAYED AND LASER-TREATED ZIRCONIA-BASED PLASMA SPRAYED COATINGS

1990 ◽  
Vol 51 (C5) ◽  
pp. C5-393-C5-402
Author(s):  
A. FERRIERE ◽  
G. FLAMANT ◽  
J.-F. ROBERT ◽  
P. PEKSHEV ◽  
I. SMUROV ◽  
...  
Keyword(s):  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Characterization of plasma sprayed coatings using thermal wave infrared video imaging

1987 ◽  
Vol 6 (4) ◽  
pp. 169-175 ◽  
Author(s):  
T. Ahmed ◽  
Z. J. Feng ◽  
P. K. Kuo ◽  
J. Hartikainen ◽  
J. Jaarinen
Keyword(s):  
Thermal Wave ◽  
Video Imaging ◽  
Infrared Video ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Comprehensive Characterization of Plasma-Sprayed Coatings Based Silver- and Copper-Substituted Hydroxyapatite

2016 ◽  
Vol 55 (5-6) ◽  
pp. 328-333 ◽  
Author(s):  
A. V. Lyasnikova ◽  
O. A. Markelova ◽  
O. A. Dudareva ◽  
V. N. Lyasnikov ◽  
A. P. Barabash ◽  
...  
Keyword(s):  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings ◽  
Comprehensive Characterization

Preparation and characterization of TiO2-based plasma-sprayed coatings for NOx abatement

2012 ◽  
Vol 191 (1) ◽  
pp. 154-158 ◽  
Author(s):  
V. Snapkauskienė ◽  
V. Valinčius ◽  
V. Grigaitienė
Keyword(s):  
Nox Abatement ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Residual Stress Measurement of Plasma Sprayed Coating Layers in ZrO2

2007 ◽  
Vol 544-545 ◽  
pp. 451-454
Author(s):  
Soo Wohn Lee ◽  
Jia Zhang ◽  
Huang Chen ◽  
J. S. Song ◽  
Jae Kyo Seo ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Measurement ◽  
Diffraction Method ◽  
Spray Coating ◽  
X Ray Diffraction ◽  
Plasma Sprayed Coatings ◽  
Coating Layers ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Plasma sprayed coatings have been widely applied in modifying surface properties of metal components. It is also useful to prevent various types of wear, corrosion, erosion and thermal. But the residual stress is still an important problem which can effect the properties of sprayed coating. So it’s necessary to find out the reason of residual stress and the relationship between plasma sprayed condition and residual stress. Plasma spray coating layers with conventional ZrO2 powder was examined to calculate residual stress by X-ray diffraction method with various coating thickness.

New Challenge of Plasma Spray Coatings in Nano Oxide Ceramics

2006 ◽  
Vol 317-318 ◽  
pp. 533-538
Author(s):  
Soo Wohn Lee ◽  
Huang Chen ◽  
Yi Zeng ◽  
Chuan Xian Ding
Keyword(s):  
Electron Microscopy ◽  
Deposition Efficiency ◽  
Metallic Substrate ◽  
Atmospheric Plasma ◽  
Ceramic Powders ◽  
Plasma Sprayed Coatings ◽  
Coating Layers ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Nanostructured and conventional Al2O3, ZrO2, and TiO2 were deposited using an atmospheric plasma spraying (APS). The size of commercial nano-ceramic powders was varied from 5nm up to 150nm. The microstructure and phase composition of the plasma sprayed coatings on metallic substrate were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). It was found that nano-sized ceramic powders enhanced the deposition efficiency on the metallic substrate rather than the micro-sized conventional commercial powders. Density and mechanical property such as microhardness were better in the case of the nano-sized ceramic powders than that of the conventional micro-sized ceramic powders, which are associated with the fine surface roughness and less size in pores of the coating layers. The wear rate of the nanostructured coating was lower than that of the conventional coating. The results were explained in terms of their microstructure of the coatings layers. Also, photocatalytic characterization of the plasma sprayed coatings, using nanocrystalline size TiO2 as feedstock with various powder sizes and shapes as well as adding with different photocatalytic oxides, was performed. The photocatalytic reactivity using plasma sprayed coating layers can be utilized into various applications.

scholarly journals Porosity and Its Significance in Plasma-Sprayed Coatings

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 460 ◽  
Author(s):  
John Gerald Odhiambo ◽  
WenGe Li ◽  
YuanTao Zhao ◽  
ChengLong Li
Keyword(s):  
Working Environment ◽  
Atmospheric Plasma ◽  
Formation Mechanisms ◽  
Multilayer Coatings ◽  
Oxide Coatings ◽  
Spraying Parameters ◽  
Plasma Sprayed Coatings ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Porosity in plasma-sprayed coatings is vital for most engineering applications. Porosity has its merits and demerits depending on the functionality of the coating and the immediate working environment. Consequently, the formation mechanisms and development of porosity have been extensively explored to find out modes of controlling porosity in plasma-sprayed coatings. In this work, a comprehensive review of porosity on plasma-sprayed coatings is established. The formation and development of porosity on plasma-sprayed coatings are governed by set spraying parameters. Optimized set spraying parameters have been used to achieve the most favorable coatings with minimum defects. Even with the optimized set spraying parameters, defects like porosity still occur. Here, we discuss other ways that can be used to control porosity in plasma-sprayed coating with emphasis to atmospheric plasma-sprayed chromium oxide coatings. Techniques like multilayer coatings, nanostructured coatings, doping with rare earth elements, laser surface re-melting and a combination of the above methods have been suggested in adjusting porosity. The influences of porosity on microstructure, properties of plasma-sprayed coatings and the measurement methods of porosity have also been reviewed.

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