Evaluating Some Functional Properties of Surfaces with Partially Regular Microreliefs Formed by Ball-Burnishing

Dzyura, Volodymyr; Maruschak, Pavlo; Slavov, Stoyan; Dimitrov, Diyan; Semehen, Volodymyr; Markov, Oleksandr

doi:10.3390/machines11060633

Cited by 5 publications

(3 citation statements)

References 21 publications

(24 reference statements)

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“…The hills are above the intersection of perpendicular twin threads. The average distance in height between the bottom of the valleys and the tops of the hills ( R t according to [ 78 ]) reaches 11.6 ± 4.1 μm and 48.0 ± 3.0 μm for smooth and wavy surfaces, respectively. The distance between the highest points of neighboring hills (280 ± 20 μm) is equal to the mesh pitch size of reinforcing cloth.…”

Section: Resultsmentioning

confidence: 99%

“…The hills are above the intersection of perpendicular twin threads. The average distance in height between the bottom of the valleys and the tops of the hills (Rt according to [78]) reaches 11.6 ± 4.1 µm The surface of the wet CJMA-2 membrane, into which the reinforcing fabric is pressed, is smoother compared to the opposite more wavy surface (Figure 5). The valleys correspond to the middle of the mesh of the reinforcing cloth.…”

Section: Surface Geometry and Hydrophilicitymentioning

confidence: 99%

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Phosphates Transfer in Pristine and Modified CJMA-2 Membrane during Electrodialysis Processing of NaxH(3−x)PO4 Solutions with pH from 4.5 to 9.9

et al. 2023

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Phosphate recovery from different second streams using electrodialysis (ED) is a promising step to a nutrients circular economy. However, the relatively low ED performance hinders the widespread adoption of this environmentally sound method. The formation of “bonded species” between phosphates and the weakly basic fixed groups (primary and secondary amines) of the anion exchange membrane can be the cause of decrease in current efficiency and increase in energy consumption. ED processing of NaxH(3−x)PO4 alkaline solutions and the use of intense current modes promote the formation of a bipolar junction from negatively charged bound species and positively charged fixed groups. This phenomenon causes a change in the shape of current–voltage curves, increase in resistance, and an enhancement in proton generation during long-term operation of anion-exchange membrane with weakly basic fixed groups. Shielding of primary and secondary amines with a modifier containing quaternary ammonium bases significantly improves ED performance in the recovery of phosphates from NaxH(3−x)PO4 solution with pH 4.5. Indeed, in the limiting and underlimiting current modes, 40% of phosphates are recovered 1.3 times faster, and energy consumption is reduced by 1.9 times in the case of the modified membrane compared to the pristine one. Studies were performed using a new commercial anion exchange membrane CJMA-2.

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Section: Resultsmentioning

confidence: 99%

“…The hills are above the intersection of perpendicular twin threads. The average distance in height between the bottom of the valleys and the tops of the hills (Rt according to [78]) reaches 11.6 ± 4.1 µm The surface of the wet CJMA-2 membrane, into which the reinforcing fabric is pressed, is smoother compared to the opposite more wavy surface (Figure 5). The valleys correspond to the middle of the mesh of the reinforcing cloth.…”

Section: Surface Geometry and Hydrophilicitymentioning

confidence: 99%

Phosphates Transfer in Pristine and Modified CJMA-2 Membrane during Electrodialysis Processing of NaxH(3−x)PO4 Solutions with pH from 4.5 to 9.9

et al. 2023

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“…The influence of different types of texture on wear performance [1, [7][8][9]11,[15][16][17][18][19][20][21][22][23]; -…”

Section: Introductionmentioning

confidence: 99%

Change in Time of the Value of Dry and Lubricated Friction Coefficients for Surfaces Generated by Different Processing Methods

Nagîț,

Mihalache,

Dodun

et al. 2023

Lubricants

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The surfaces of the mechanical parts involved in friction processes are made using different processing methods. Each of these processing methods leads to a certain profile of the asperities of the generated surfaces. When such surfaces are subjected to friction processes, it is possible to produce a change in time in the magnitude of the friction coefficient. For experimental research, the outer cylindrical surfaces of some steel test samples were generated using various machining methods such as turning, grinding, ball and diamond burnishing, and vibroburnishing. Later, using a device adapted to a lathe, experimental tests were carried out following the time variation of the value of the friction coefficient under conditions of dry friction and lubricated friction, respectively. The results of the experimental tests were processed mathematically, being determined by empirical mathematical models that highlight the influence of the final processing methods of the surface, the presence of the lubricant, and the test duration on the variation of the friction coefficient. It was found that first, there is an increase over time in the values of the friction coefficient, and then the values of this coefficient stabilize at certain values. The increase in the coefficient of friction until reaching the stabilization value takes place in a proportion of approximately 148–305%.

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Analysis of Causes that Lead to Failure of Conical Discs of Variable Automatic Transmissions

Dzyura,

Maruschak,

Semehen

et al. 2024

J Fail. Anal. and Preven.

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Evaluating Some Functional Properties of Surfaces with Partially Regular Microreliefs Formed by Ball-Burnishing

Cited by 5 publications

References 21 publications

Phosphates Transfer in Pristine and Modified CJMA-2 Membrane during Electrodialysis Processing of NaxH(3−x)PO4 Solutions with pH from 4.5 to 9.9

Phosphates Transfer in Pristine and Modified CJMA-2 Membrane during Electrodialysis Processing of NaxH(3−x)PO4 Solutions with pH from 4.5 to 9.9

Change in Time of the Value of Dry and Lubricated Friction Coefficients for Surfaces Generated by Different Processing Methods

Analysis of Causes that Lead to Failure of Conical Discs of Variable Automatic Transmissions

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