Wyniki wyszukiwania - BazTech

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Energy state impact on friction and wearing in combustion engines

Borkowska J., Kaźmierczak A.

Journal of KONES

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2017

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Vol. 24, No. 4

25--30

EN

Friction pairs are designed from elements, where is very difficult to define in unequivocal way all optimal parameters. Research on stability of friction pairs are focused on the surface and the top layer of surface in the parts. The main goal is find new solutions to design and material, thereby achieving one million kilometres of mileage to main repair in the case of internal combustion engines. The biggest structural difficulties are noticeable in friction pairs where we can observe sliding and returning motion, which is also connected with sealing function. Piston – ring – cylinder assembly of combustion engine has many friction pair's examples, also one of them, which decide about fastness to wear. A typical example of such a pair is first sealing ring – cylinder sleeve, called further in piston – rings – cylinder unit in combustion engine. Engineers are currently seeking an additional factor, which would be unable to gain the reduction of tangential force by reducing the friction coefficient in elements of friction pair during operations. Such a factor may be the surface free energy that results from molecular structure and nature of the bonds between the molecules present in the material. Components of surface free energy determine the tribological properties of the material, which is reflected in the stability of the units. The work aims to show the possibilities and benefits of the application of this new method in order to reduce wearing, which is consistent with the observed trend of technology development.

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Determining the value of surface free energy on the basis of the contact angle

Kłonica M., Kuczmaszewski J.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 1

66--74

EN

This paper presents the results of tests concerning the value of surface free energy on the basis of measurements of contact angle with measure liquids: distilled water and diiodomethane. The surface of steel-316L samples was modified in an ozone atmosphere, and the concentration of ozone and the conditioning time of the samples in the reaction chamber were changed. The results of tests concerning the measurements of the value of surface free energy were subject to analysis. Also analysed were the components of SFE: the polar and dispersive components. The obtained test results were analysed in statistical terms. The paper ends with conclusions.

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Wyznaczanie wartości swobodnej energii powierzchniowej dla stali 316L po ozonowaniu

Kłonica M., Kuczmaszewski J.

Mechanik

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2016

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R. 89, nr 11

1606--1607

PL

Stale stopowe, w tym stal 316L, w technologii klejenia, hermetyzacji czy malowania wymagają – obok obróbki mechanicznej – specjalnych metod kształtowania właściwości energetycznych warstwy wierzchniej. Często jest to obróbka chemiczna lub elektrochemiczna. Ze względów ekologicznych i ekonomicznych nie są to technologie chętnie stosowane. W pracy zbadano właściwości energetyczne warstwy wierzchniej stali 316L po ozonowaniu w różnych warunkach. Udowodniono, że ozonowanie może być alternatywną technologią dla obróbki chemicznej lub elektrochemicznej.

EN

Alloy steels, including 316L stainless steel in adhesion technology, encapsulation or painting, require, in addition to machining, special methods of shaping surface energy properties, it is often a chemical treatment or electrochemical. Due to economic and ecological technologies are not readily used. In this paper was performed to study surface energy properties of 316L stainless steel after ozone under different conditions. It has been shown that the ozonation may be an alternative technology for the chemical or electrochemical.

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Analysis And Assessment Of The Acoustic Emission Suitability For Determination Of The Energy States Of A Tribological System In The Form Of A Four-Ball Tester Friction Node

Bzura P.

Journal of Polish CIMAC

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2008

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Vol. 3, no 1

9-13

EN

The present operating safety and cost reduction requirements of the compression ignition engines make it necessary to search for new methods of detecting their defects, e.g. by the analysis of acoustic emission signals coming from the slide bearings. The paper presents non-destructive measurements of acoustic emission (AE) in order to obtain information on the processes taking place in a tribological system under the continuously increasing load.