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Content available remote Cavitation erosion resistance influence of material properties
Zakrzewska D. E., Krella A. K.
Advances in Materials Science
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2019
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Vol. 19, nr 4(62)
18--34
EN
The cavitation erosion is the phenomena that causes degradation of fluid flow machinery components due to repetitive implosion of cavitation bubbles adjacent to the solid surface. Cavitation erosion is a complex phenomenon, which includes not only hydrodynamic factors of liquid, but also properties of erodible material e.g. microstructure, hardness or Young modulus. In order to reduce the negative impact of erosion on machine components, there are many methods to increase cavitation erosion resistance. The paper discusses the correlations between structural and mechanical properties and the resistance to cavitation erosion (CER) of pure materials, their alloys and coatings. Methods to increase CER have also been described - using heat / thermo-chemical treatment and application of coatings by various methods.
2
Content available remote An influence of factors of flow condition, particle and material properties on slurry erosion resistance
Buszko M. H., Krella A. K.
Advances in Materials Science
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2019
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Vol. 19, nr 2(60)
28--53
EN
The degradation of materials due to slurry erosion is the serious problem which occurs in the power industries. The paper presents actual knowledge about an influence of individual factors connected with flow conditions, particles and material properties on the slurry erosion resistance. Among the factors connected with operating conditions, an influence of impact angle, and velocity of impact, particle concertation and liquid temperature have been described. In case of the factors connected with solid particle properties, an influence of the size, shape and hardness have been discussed. In the part devoted to the impact of material properties, due to different types of materials, the issues of resistance to erosion of slurries related to the properties of steel, ceramics and polymers are discussed separately. In the paper has been shown that a change of any of mentioned factors causes a change in the erosion rate due to the synergistic effects that accompany to slurry degradation.
3
Content available remote Cavitation erosion – phenomenon and test rigs
Krella A. K., Zakrzewska D. E.
Advances in Materials Science
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2018
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Vol. 18, nr 2(56)
15--26
EN
The cavitation and cavitation erosion phenomenon have been shortly presented. The main four types of test rigs to investigate the cavitation erosion resistance have been shown. Each type of test design is described and an example of a design is shown. A special attention has been payed to the designs described in the International ASTM Standards: a vibratory design and a cavitating jet cell. There was shown that the design of a test device and the test conditions affect the resistance to cavitation erosion of a material.
4
Content available remote Slurry erosion - design of test devices
Buszko M. H., Krella A. K.
Advances in Materials Science
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2017
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Vol. 17, nr 2(52)
5--17
EN
Degradation of material caused by impacts of a solid particle (erodent) suspended in a liquid is called slurry erosion and is a major problem in the hydropower and maritime industry. Slurry erosion depends on many factors, e.g. liquid and erodent velocity, size, shape, angle of impact, hardness and number of erodents, and strength of a target material. The various types of test devices have been designed to investigate an effect of mentioned parameters on material resistance. In the paper are described main types of the test apparatus showing their main advantages and disadvantages. Some results of slurry erosion resistance of few groups of materials are also presented.
5
Content available remote Al2O3 + TiO2 thin film made by electrostatic spray deposition
Krella A. K., Krupa A., Sobczyk A. T., Jaworek A.
Advances in Materials Science
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2016
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Vol. 16, nr 3(49)
47--55
EN
In this work electrostatic spray deposition process was used to deposit thin Al2O3 + TiO2 ceramic thin film on X10CrAlSi18 steel from colloidal suspension of TiO2 powder in Al2O3 precursor solution. The precursor was 3% solution of Al2(NO3)3 in ethanol. An influence of the thermal treatment after film deposition on protective properties against high temperatures and film endurance were investigated. The resistance against thermal cycles and dynamic impacts were tested. Performed investigations showed that the best protective properties had the Al2O3 + TiO2 film sintered at 1000°C.
6
Osadzanie warstw Al203 metodą rozpylania ektrohydrodynamicznego
Krella A. K., Sobczyk A., Jaworek A., Krupa A.
Inżynieria Materiałowa
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2013
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Vol. 34, nr 5
488--492
PL
W pracy omówiono metodę rozpylania elektrohydrodynamicznego oraz przedstawiono właściwości uzyskanych tą metodą warstw Al2O3. Rozpylanie elektrohydrodynamiczne jest procesem atomizacji cieczy za pomocą sił elektrycznych bez udziału innych mechanicznych źródeł energii potrzebnych do rozdrobnienia cieczy. Warstwy są osadzane z zawiesiny koloidalnej osadzanego materiału w odpowiednim rozpuszczalniku, którym może być etanol, metanol lub glikol etylenowy. W pracy warstwy wytwarzano z nanocząstek A120, zawieszonych w etanolu z dodatkiem substancji wiążącej Ceram-bond, poprawiającej przyczepność powłoki do podłoża. Uzyskane warstwy miały strukturę porowatą, przy czym w strefie centralnej w pobliżu dyszy kapilarnej stopień porowatości był większy niż w strefie brzegowej. Zaobserwowano, że wzrost zawartości Ceram-bondu w zawiesinie koloidalnej sprzyja powstaniu bardziej zwartej struktury powłoki.
EN
In this paper the method of electrohydrodynamic deposition was presented and the properties of deposited Al203, layers were shown. Electrohydrodynamic atomization (electrospraying) is a method of liquid atomization by means of electrical forces without using mechanical energy. A solid layer is obtained from a colloidal suspension of deposited material in an appropriate solvent, which can be methanol, ethanol or ethylene glycerol. In this paper the layers were deposited from nanoparticles of Al203, suspended in ethanol with the addition of Ceram-bond, which improved adhesion. The obtained Al2O3 layers had porous structure, with higher porosity in the central zone, under the capillary nozzle than in the peripheral Zone. It was observed that the addition of Ceram-bond caused the layer to be tighter.
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