Considerations regarding the erosion mechanism of vibratory cavitation

Lazăr, Iosif; Bordeaşu, Ilare; Popoviciu, M O; Mitelea, Ion; Bena, Traian; Micu, Lavinia Mădălina

doi:10.1088/1757-899x/393/1/012040

Cited by 6 publications

(6 citation statements)

References 2 publications

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“…In theis figure is shown also a picture of Raman spectra for bulk modified polymer, figure 4b that were captured by Raman microscope. Meanwhile, it can be seen that both spectra have the same profile wit multiple peak centered on 1500 cm -1 , situation that can be associated with Raman metallic footprint, or the presence of anorganic particles shock waves, generated during bubbles implosion from cavitational cloud created through vibration [15,12], within the layer surface appear perforations, the detached area is increased and the water and bubble quantity pervaded between polymer layer and metal base is increased too; -after 30 min of cavitation, the detached area increased significantly, the adherence is much decreased, due to typical fatigue tensions. In some areas the layer is ripped and this allowed erosion, through small caverns in metallic surface.…”

Section: Experimental Part Polymermentioning

confidence: 97%

“…The comparison with some composite materials layers HVOF coated on carbon steel 270-480 W Sr ISO 13755:1995 ( powder formed of 47.08 %Cu, 28.83 % Zn, 16.2 % Ni, 6.64 % Cr, 0.32 % Ti, 0.27 % PT, 0.27 % Co, 0.22 % Fe, 0.17 % Mo [15]) and stainless steel duplex X2CrNiMoN22-5-3 (ceramic powder Thermico WC-9Co-5Cr-1Ni [12]), figure 8 with important erosions yet from of nanometric size that establish a stronger link between polymer and metallic surface.Anyway, for increasing certainty, the investigations must be continued.…”

Section: Experimental Part Polymermentioning

confidence: 99%

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New Results Regarding Cavitation Behavior of Polymers Modified with Anorganic Substances Coated on Bronze Surfaces

Micu¹,

Lazăr²,

Cîrciumaru³

et al. 2018

Mat.Plast.

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Due to mechanical resistance characteristics, chemical corrosion and abrasive erosion resistance, the polymers are more widely used in equipments and installations that are exploited in different fluid hydrodynamic conditions. Among these applications there is the protection of surfaces of hydromechanic organs stressed by cavitation, like in hydraulic machines rotors and valves. Consequently, the research aimes the extension of using these and protection of other components surfacess hardly streesed by cavitation. The research in this paper points toward the behavior of modified polymer layer, coated on surfaces of bronze used in casting the propellers of maritim and river ships. The tests were performed in standard piezoceramic crystal vibrating equipment within Cavitation Laboratory of Politehnica University of Timisoara. The damaging intensity of equipment is much greater than any cavitational vortex, created by ship propeller, hydraulic turbine or centrifugal pump. The obtained results, compared to both recorded on uncovered surfaces with polymer layer and recorded on surfaces covered with HVOF composite materials layers, show an increased resistance that implies the increased exploiting duration of those surfaces.

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Section: Experimental Part Polymermentioning

confidence: 97%

Section: Experimental Part Polymermentioning

confidence: 99%

New Results Regarding Cavitation Behavior of Polymers Modified with Anorganic Substances Coated on Bronze Surfaces

Micu¹,

Lazăr²,

Cîrciumaru³

et al. 2018

Mat.Plast.

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show abstract

“…The research procedure, specific to the laboratory, is in strict accordance with the provisions of the standard ASTM G32-2010 [10][11][12][13]. The number of samples tested, according to the custom of the laboratory, was three.…”

Section: Resultsmentioning

confidence: 99%

New Results of the Heat-Treated CuZn39Pb3 Brass Behavior and Resistance to Cavitation Erosion

Bordeaşu

Sîrbu

Lazăr

et al. 2021

KEM

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The paper presents the results of the behavior and resistance to the erosion by vibrating cavitation of the CuZn39Pb3 brass, obtained by quenching the volume heat treatment from 800°C with water cooling, followed by the stress-relief to 250°C, with air cooling. Comparison with both the delivery status and the naval brass (used for ship propellers), based on the characteristic parameters values, recommended by the ASTM G32 standards and used in the Cavitation Laboratory of the Polytechnic University of Timisoara, shows that the hardness increase resulted from the heat treatment led to a significant increase of resistance to vibrating cavitation.

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“…The equipment used to generate cavitation, found in the possession of the Cavitation Laboratory [1,2,3] of the Polytechnic University of Timisoara. The functional parameters, on which the erosive intensity of the vibrating cavity depends, are:…”

Section: Equipment and The Research Methods Usedmentioning

confidence: 99%

Evaluation of the Cavitation Resistance of INCONEL 718, in Delivered and Respectively Heat Treated Condition

Laura

Bordeaşu

Sîrbu

et al. 2020

AMR

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Inconel 718 is a very difficult metal for machining because of its high plasticity. Lately, more and more researchers are interested in using it for cavitation parts, such as the plugs and drawers of the valves. For this purpose, thermal volumetric treatments have been initiated to facilitate mechanical machining, aiming simultaneously to obtain good compression and cavitation resistance results. Therefore, this paper presents the results of cavitation erosion behavior and cavitation resistance of ICONEL 718, subjected to two thermal treatment regimes, differentiated by the duration (temperature 800 °C and residence times 5 hours, and respectively 10 hours). The assessment of the cavitation resistance provided by each heat treatment regime is based on the average durability cavitation parameter, as defined by K. Steller. The research is achieved by using the standard vibrator device with piezo - ceramic crystals from the Cavitation Laboratory of the Politechnica University of Timisoara.

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Considerations regarding the erosion mechanism of vibratory cavitation

Cited by 6 publications

References 2 publications

New Results Regarding Cavitation Behavior of Polymers Modified with Anorganic Substances Coated on Bronze Surfaces

New Results Regarding Cavitation Behavior of Polymers Modified with Anorganic Substances Coated on Bronze Surfaces

New Results of the Heat-Treated CuZn39Pb3 Brass Behavior and Resistance to Cavitation Erosion

Evaluation of the Cavitation Resistance of INCONEL 718, in Delivered and Respectively Heat Treated Condition

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