Cavitation Erosion Characteristics of an Iron-Based Coating Prepared by High Velocity Arc Spraying

2011 ◽  
Vol 189-193 ◽  
pp. 523-527
Author(s):  
Zhi Hua He ◽  
Yu Ping Wu ◽  
Hong Bin Sun ◽  
Yuan Zheng ◽  
Yu Dong ◽  
...  
Keyword(s):  
High Velocity ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Optical Microscope ◽  
Arc Spraying ◽  
X Ray Diffraction ◽  
High Velocity Arc Spraying ◽  
Iron Based ◽  
And Performance ◽  
Cavitation Erosion Resistance

In order to increase cavitation erosion resistance of fluid machinery, an iron-based coating was prepared by high velocity arc spraying (HVAS) on the surface of 1Cr18Ni9Ti stainless steel. The microstructure and performance were investigated respectively by optical microscope (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), Vickers hardness and vibratory cavitation apparatus. The results indicated that the coating had the higher hardness (8.67GPa) and the finer structure than ZG230-450 (1.86GPa) used actual in water conservancy. Compared with ZG230-450, cavitation erosion resistance of the coating was better, and the coating presented flakiness stripping mode. The results indicated that the HVAS is a promising method to prepare the cavitation resistance coating.

Cavitation Erosion Resistance of WC-Cr-Co and Cr3C2-NiCr Coatings Prepared by HVOF

2006 ◽  
Vol 15-17 ◽  
pp. 199-204 ◽  
Author(s):  
Ping Zhang ◽  
Jing Hua Jiang ◽  
Ai Bin Ma ◽  
Ze Hua Wang ◽  
Yu Ping Wu ◽  
...  
Keyword(s):  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Optical Microscope ◽  
Hard Coatings ◽  
X Ray Diffraction ◽  
Coating Materials ◽  
And Performance ◽  
Cavitation Erosion Resistance ◽  
Microstructure And Performance ◽  
Better Than

With the aim to obtain the high cavitation-erosion-resistance coating for the surface safeguard of fluid machinery, two kinds of hard coatings (WC-Cr-Co and Cr3C2-NiCr) were prepared on 1Cr18Ni9Ti substrate by high velocity oxy-fuel spraying (HVOF), which microstructure and performance were investigated respectively by optical microscope, X-ray diffraction, Vickers hardness, scanning electron microscope (SEM), and vibratory cavitation apparatus. The results indicated that these two coatings had the higher hardness and the finer structure than ZG06Cr13Ni5Mo, which is used actual in water conservancy. The results of cavitation erosion continued for 39 hours presented that the mass loss of WC-Cr-Co and Cr3C2 -NiCr coatings increased ceaselessly with time, and the cavitation erosion speeds varied with time. Compared with ZG06Cr13Ni5Mo, their cavitation erosion resistance performances were better due to their higher hardness and finer structure, and WC-Cr-Co coating was much better than Cr3C2-NiCr coating. Obviously, the higher hardness and finer structure could strengthen the cavitation erosion resistance of coating materials.

Effect of Vanadium and Niobium on Abrasive Behaviour of Arc Sprayed 4Cr13 Coatings

2013 ◽  
Vol 395-396 ◽  
pp. 712-717 ◽  
Author(s):  
Yu Deng ◽  
Sheng Fu Yu ◽  
Ning Yan ◽  
Shu Le Xing ◽  
Lin Bing Huang
Keyword(s):  
High Velocity ◽  
Low Carbon Steel ◽  
Optical Microscope ◽  
Arc Spraying ◽  
Low Carbon ◽  
X Ray Diffraction ◽  
Improve Performance ◽  
Hard Particles ◽  
High Velocity Arc Spraying ◽  
Stainless Steel Coatings

4Cr13 martensitic stainless steel coatings with different amount of V/Nb were prepared on the surface of the Q235 low-carbon steel by high velocity arc spraying (HVAS). The microstructure and properties of the coatings were characterized and tested by scanning electron microscope (SEM), X-ray diffraction (XRD), optical microscope, microhardness tester and wear tester. And the wear mechanisms of the coatings have been studied. The results showed that optimal percentage of V/Nb could improve performance of the coatings. The coatings had good forming properties, uniformity of microstructure and compact structure.The highest value of adhesion strength was up to about 36.80 Mpa. The hard particles could incease the hardness and wear resistanc of the coatings.The average microhardness was about 523 HV0.1, higher than that of 4Cr13 coatings, and the abrasive wear resiatance was enhanced because of the added elements V and Nb. Key words: alloying coatings; 4Cr13; V/Nb; high velocity arc spraying (HVAS); abrasive behaviour

Microstructure and Cavitation Erosion Behavior of Carbide-Based Coating Deposited by Electrical Arc Spraying

2011 ◽  
Vol 189-193 ◽  
pp. 498-502
Author(s):  
Sheng Hong ◽  
Yu Ping Wu ◽  
Hong Bin Sun ◽  
Yuan Zheng ◽  
Qi Fan Dai ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Mass Loss ◽  
Standard Method ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Arc Spraying ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrical Arc ◽  
Cavitation Erosion Resistance

Two different martensite stainless steel 1Cr17/Carbide-based coatings (C-1 and C-2) were prepared by electrical arc spraying technique. Microstructures of the coatings were investigated by optical microscopy (OM), X-ray diffraction (XRD), scanning election microscopy (SEM). The results show that the C-2 coating has higher hardness and finer structure than the C-1 coating. The cavitation erosion resistance was tested using a China GB6383-86 standard method in fresh water. The cavitation erosion mass loss of the C-2 coating was only 55 percent that of the C-1 coating eroded 15h, the C-2 coating has better cavitation erosion resistance.

Cavitation Erosion Resistance of Silicified Graphite by Liquid Silicon Penetration Technique

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Hongqin Ding ◽  
Shuyun Jiang
Keyword(s):  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Test System ◽  
Surface Microstructure ◽  
Chemical Compositions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sic Ceramic ◽  
Cavitation Erosion Resistance ◽  
Sem Morphology

This technical brief studied the cavitation erosion behavior of the silicified graphite. The phase constituents, surface microstructure, and chemical compositions of silicified graphite were examined by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS), respectively. Cavitation experiments were carried out by using an ultrasonic vibration test system. The experimental results show that the silicified graphite exhibits an excellent cavitation erosion resistance; this can be attributed to the fact that the silicified graphite has the characteristics of both the silicon carbide and the graphite. The SEM morphology studies of the erosion surfaces indicated that the inherent brittleness of SiC ceramic material results in the formation of erosion pits on the surface of silicified graphite.

scholarly journals Cavitation Erosion Resistance and Wear Mechanism Model of Flame-Sprayed Al2O3-40%TiO2/NiMoAl Cermet Coatings

Coatings ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 254 ◽  
Author(s):  
Mirosław Szala ◽  
Tadeusz Hejwowski
Keyword(s):  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Ceramic Powder ◽  
X Ray Diffraction ◽  
Low Velocity ◽  
Cermet Coatings ◽  
X Ray ◽  
Mechanism Model ◽  
Cavitation Erosion Resistance ◽  
Sprayed Coatings

This manuscript deals with the cavitation erosion resistance of flame-sprayed Al2O3-40%TiO2/NiMoAl cermet coatings (low-velocity oxy-fuel (LVOF)), a new functional application of cermet coatings. The aim of the study was to investigate the cavitation erosion mechanism and determine the effect of feedstock powder ratio (Al2O3-TiO2/NiMoAl) of LVOF-sprayed cermet coatings on their cavitation erosion resistance. As-sprayed coatings were investigated for roughness, porosity, hardness, and Young’s modulus. Microstructural characteristics of the cross section and the surface of as-sprayed coatings were examined by light optical microscopy (LOM), scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) methods. Coating cavitation tests were conducted in accordance with the ASTM G32 standard using an alternative stationary specimen testing method with usage of reference samples made from steel, copper, and aluminum alloys. Cavitation erosion resistance was measured by weight and volume loss, and normalised cavitation erosion resistance was calculated. Surface eroded due to cavitation was examined in successive time intervals by LOM and SEM-EDS. On the basis of coating properties and cavitation investigations, a phenomenological model of the cavitation erosion of Al2O3-40%TiO2/NiMoAl cermet coatings was elaborated. General relationships between their properties, microstructure, and cavitation wear resistance were established. The Al2O3-40%TiO2/NiMoAl composite coating containing 80% ceramic powder has a higher cavitation erosion resistance than the reference aluminium alloy.

Study on Cavitation Erosion Properties of Stainless Steel Vane Wheel Enhanced by Electro-Spark Deposition (ESD) Technology

2011 ◽  
Vol 239-242 ◽  
pp. 2229-2232 ◽  
Author(s):  
Chang Jun Chen ◽  
Yan Zhan Su ◽  
Qin Cao ◽  
Min Zhang
Keyword(s):  
Stainless Steel ◽  
Cavitation Erosion ◽  
Energy Dispersive Spectrometry ◽  
Erosion Resistance ◽  
Optical Microscope ◽  
Ultrasonic Equipment ◽  
Erosion Properties ◽  
Preliminary Study ◽  
Cavitation Erosion Resistance ◽  
Scanning Electron

In this paper, Electro-Spark Deposition (ESD) technology was used to enhance the cavitation erosion resistance of the stainless steel. The microstructure and composition of the deposition layers were studied by optical microscope (OM), scanning electron microscope (SEM) and energy dispersive Spectrometry (EDS) on cavitation erosion resistance was investigated. The microhardness was measured too. The cavitation erosion resistance was measured in ultrasonic equipment. The preliminary study confirmed that the cavitation erosion resistance of the deposition layer was enhanced compared to the untreated substrate. Now, vane wheel made of cast-iron, stainless steel and oil bump damaged by cavitation erosion have been repaired by ESD. And the properties of the repaired vane wheels were the same as the new ones.

Technics and performance analysis of Monel alloy coating prepared by high velocity arc spraying

2013 ◽  
Vol 17 (sup1) ◽  
pp. 112-114 ◽  
Author(s):  
J. Zhan ◽  
Z. Li ◽  
J. Lu ◽  
Y. J. Wu ◽  
L. Q. Zhao ◽  
...  
Keyword(s):  
Performance Analysis ◽  
High Velocity ◽  
Alloy Coating ◽  
Arc Spraying ◽  
High Velocity Arc Spraying ◽  
And Performance
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