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

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.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.189-193.523 ◽

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.

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Cavitation Erosion Resistance of Silicified Graphite by Liquid Silicon Penetration Technique

Journal of Tribology ◽

10.1115/1.4035869 ◽

2017 ◽

Vol 139 (6) ◽

Cited By ~ 1

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.

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Experimental Study on Abrasion and Cavitation Resistance of Non-Metallic Coating Materials for Pump

Volume 1: Fluid Mechanics ◽

10.1115/ajkfluids2019-5003 ◽

2019 ◽

Author(s):

Hou-lin Liu ◽

Man-hui Cao ◽

Jie Chen ◽

Yong Wang ◽

Cheng-bin Wang

Keyword(s):

Wear Resistance ◽

Epoxy Resin ◽

Abrasion Resistance ◽

Cavitation Erosion ◽

Erosion Resistance ◽

Composite Resin ◽

Metallic Coating ◽

Test Time ◽

Coating Materials ◽

Cavitation Erosion Resistance

Abstract The protection of the flow-passage components of pump by using coating is an important method to increase wear resistance. This paper aims at examining abrasion resistance and cavitation erosion resistance of three typical non-metallic coating materials for pump including epoxy resin mortar, composite resin mortar and polyurethane. A wear-resistance test bench was built, using ultrasonic vibrating air eroding machine. Meanwhile, the main relative raw materials and formulas were introduced. The results indicate that: (1) The accumulated volume reduction of abrasion of composite resin mortar changes in an oblique waveform, and its abrasion resistance is better than that of epoxy resin mortar in a short period of time. The wear rate of epoxy resin mortar and composite resin mortar is higher than that of polyurethane. The total wear volume of epoxy resin mortar, composite resin mortar and polyurethane is decreased by 8.74%, 9.89% and 0.58% respectively within 30h of anti-wear test time; (2) The accumulated volume reduction of cavitation erosion of epoxy resin mortar is proportional to the time. In anti-cavitation erosion test time of 26 h, the erosion volume of composite resin mortar, polyurethane and epoxy resin mortar cavitation is reduced by 0.44%, 0.29% and 0.35%, respectively. It shows that cavitation erosion resistance of three coating materials is similar, while polyurethane materials have the best abrasion resistance.

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

Coatings ◽

10.3390/coatings8070254 ◽

2018 ◽

Vol 8 (7) ◽

pp. 254 ◽

Cited By ~ 19

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.

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Comparative Study of Two Laser Coatings Used in Turbine Blades

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.711.193 ◽

2014 ◽

Vol 711 ◽

pp. 193-196

Author(s):

Wei Fu Wang ◽

Jian Zhou Xie ◽

Liu Yi Huang ◽

Fang Fang Zhang

Keyword(s):

Titanium Alloy ◽

Comparative Analysis ◽

Comparative Study ◽

Cavitation Erosion ◽

Erosion Resistance ◽

Turbine Blades ◽

Formation Mechanisms ◽

Cavitation Erosion Resistance ◽

Martensite Matrix ◽

Better Than

In order to compare the performances of two typical laser coatings used in turbine blades, the Ti-N coatings of Ti6Al4V alloy and solution-aging coatings of 17-4PH alloy were fabricated by laser treatment with optimized parameters, respectively. The formation mechanisms and performances are comparative investigated by SEM, TEM and cavitation erosion tester. The results show that the Ti-N coatings are mainly reinforced by Ti2N and α′ martensite. For 17-4PH samples, the TEM observation displays that the ε-Cu particles, which are in the size of 2-5 nm and disperse homogeneously in the martensite matrix, are the main reinforcing phases. Both the 17-4PH samples and the Ti6Al4V samples are reinforced homogeneously. Comparative Analysis indicates that the hardness of the Ti-N coatings on Ti6Al4V substrate is lower than that of solution-aging samples (on 17-4PH). However, the cavitation erosion resistance of the Ti-N coatings are better than that of solution-aging samples, which implies that the titanium alloy with Ti-N coatings are well candidate to instead of 17-4PH steel for the application in turbine blades.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.189-193.498 ◽

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.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.2229 ◽

2011 ◽

Vol 239-242 ◽

pp. 2229-2232 ◽

Cited By ~ 1

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.

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