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Wyszukujesz frazę "Wojciechowski, L." wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
The preparation of surface layer of non-alloyed steel to cooperation with lubricating medium
Autorzy:
Wojciechowski, Ł.
Nosal, S.
Powiązania:
https://bibliotekanauki.pl/articles/245997.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
surface layer
energy conditions
free surface energy
adhesive scuffing
wetting angle
Auger electron spectroscopy
Opis:
This paper discusses the influence of cold working to energy conditions of the surface layer of steel 15; it is evaluated with the use of free surface energy calculated (with polar-dispersive method) on the basis of wetting angle measurements. The samples subjected to such working method were also subjected to scuffing resistance tests performed on the pair of counter-samples made of steel 45. In the paper procedure of scuffing was described. Moreover, the methods of results evaluation were put. The tests were carried out in lubricating conditions of different mechanisms of interaction with the lubricated surface. They found out that the free surface energy increase influenced the scuffing resistance decrease for the pairs lubricated with surface non-active substances. However, the resistance increased for the pair lubricated with substances reacting chemically with the surface. In the paper example of test results, average valves of free surface energy were presented. The obtained tests results were verified by the comparison with the results of the experiment where the surface layer energy conditions were evaluated with the use of Auger electron spectroscopy. Changes with coldplastic work to the surface layer can prepare it to co-operation with active lubricants and thus increase its adhesive scuffing resistance.
Źródło:
Journal of KONES; 2009, 16, 1; 533-540
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Material investigations of composites and their selected applications in motor transport
Autorzy:
Rudnik, D.
Pietrzak, K.
Wojciechowski, A.
Sobczak, J.
Kowalewski, Z. L.
Powiązania:
https://bibliotekanauki.pl/articles/243917.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
metal matrix composites
microstructure
properties
applications
Opis:
The paper presents advances in the range of brake discs and engine pistons production using metal matrix composites and identifies their advantages in comparison to materials traditionally applied. The wear characteristics in the case of brake discs and thermal shock resistance in the case of pistons were determined. The wear was assessed by measurements of friction coefficients in different temperatures. The thermal shock resistance was described as the crack length formed during the tests. The image analysis was used in the quantitative microstructure assessments for determination of synthetic geometrical parameter correlated with composites properties. The two synthetic geometrical variables have been proposed in the microstructure description of a new generation brake discs and pistons. The selected relationships between functional properties and composite microstructure are presented. It was shown that a life of brake discs made from A359 aluminum alloy reinforced by SiC precipitates is much longer in comparison to traditional, made from cast iron. It was ascertained also that the best thermal shock resistance was obtained in the case of AK12 composite with Al2O3 short fibers in cast heat treated. The results may be treated as the base for the recommendations of tested metal matrix composites for applicability in selected vehicle parts and subsets producing.
Źródło:
Journal of KONES; 2008, 15, 2; 399-407
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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