Wyniki wyszukiwania - Biblioteka Nauki

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Bench tests results analysis of the engines modelled elements

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Kaźmierczak A.

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tom R. 52, nr 3

843--848

EN

This paper presents an analysis of the bench tests results of an internal combustion engines modelled elements. The investigated samples was made through the technology used to manufacture the cylinder and piston rings. The original materials and coatings were retained. The aim of this research was to determine the influence of employed coatings on friction and friction pairs wear resistant in an internal combustion engines. The emphasis was given here on the variant investigation in which the counterface was made of nitrided cast iron or was not subjected to this process.

PL

W artykule przedstawiono analizę wyników stanowiskowych badań modelowych elementów silników spalinowych. Badaniom poddano próbki wykonane z użyciem technologii stosowanych do wykonywania cylindrów oraz pierścieni tłokowych. Zachowano oryginalne materiały oraz powłoki. Celem badań było określenie wpływu powłok przeciwzużyciowych na tarcie i zużycie par trących stosowanych w silnikach spalinowych. Badania przeprowadzono wariantowo z zastosowaniem przeciw próbek żeliwnych azotowanych i nie poddanych procesowi azotowania.

2

Effect of Face Milling Parameters of Carbon Fiber Reinforced Plastics Composites on Surface Properties

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Miturska-Barańska I. , Józwik J. , Bere P.

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2022

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tom Vol. 16, no 2

26--38

EN

This paper analyses the influence of face milling process parameters on the surface properties of carbon fibre reinforced polymer. The influence of milling speed and feed per tooth on the surface properties was determined. The influence of cutting speed and feed per tooth on surface energy properties was determined. The object of research was a carbon fiber reinforced plastics (CFRP) composites plate made of carbon fibre in epoxy matrix. The tool used in the study was a double-edged end mill. The machining parameters used were variable: cutting speeds of 100 m·min-1, 120 m·min-1, 140 m·min-1 and 160 m·min-1, and feeds per tooth of 0.015 mm/tooth, 0.020 mm/tooth, 0.025 mm/tooth and 0.03 mm/tooth. The axial depth of cut and radial depth of cut was a constant parameter. After milling, tests were carried out on the surface contact angle, which was used to determine the surface free energy. Based on the contact angle measurements carried out with the sitting-drop method and the calculation of the surface free energy with the Owens-Wendt model, it was observed, that the increase in the value of the surface free energy is significantly influenced by the increase in the cutting speed.

3

The Effect of Atomic Layer Deposition of ZrO2 on the Physicochemical Properties of Cobalt based Alloys Intended for Prosthetic Dentistry

99%

Ziębowicz A. , Woźniak A. , Ziębowicz B. , Kosiel K. , Chladek G.

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2018

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tom Vol. 63, iss. 3

1077--1082

EN

The paper presents the effect of ZrO2 layer deposition by the ALD process on the physicochemical properties of cobalt-based alloys (Realloy C and EOS CoCr SP2) intended for application in prosthetic dentistry. The paper shows the results of the surface roughness measurements made by the AFM method as well as the wettability and free surface energy measurements. Additionally, potentiodynamic tests of pitting corrosion resistance and electrochemical impedance spectroscopy in a solution of artificial saliva were carried out. Tests were carried out on the samples in the initial state and after surface modification with the ZrO2 layer. Based on these results, the usefulness (e.g. enhancement of corrosion resistance and biocompatibility) of the proposed ZrO2 layer on the cobalt alloys was assessed.

4

Wpływ promieniowania UV na właściwości powierzchniowe kompozytów polilaktydowych

80%

Olewnik E. , Kilian A. , Richert J.

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tom [R.] 18, nr 6

614-618

PL

Folie o różnym składzie, zawierające polilaktyd, montmorylonit (1-5%wag.), Nanofil2 (1-5%wag.) oraz poli(kaprolaktam) jako kompatybilizator poddano analizie powierzchni za pomocą skaningowej mikroskopii elektronowej. Następnie zostały one wystawione na różny czas działanie promieniowania UV (max. 254 nm). Wpływ promieniowania na właściwości warstwy wierzchniej analizowanych materiałów określono za pomocą badania kąta zwilżania przed i bezpośrednio po naświetlaniu. Na podstawie uzyskanych wartości obliczono swobodną energię powierzchniową (SEP) metodą Owensa-Wendta. Otrzymane wartości SEP wskazują na to, iż ilość i rodzaj stosowanych dodatków oraz produkty degradacji powstające podczas naświetlania mają istotny wpływ na wartość SEP.

EN

Films consisting of different quantity of polylactide, montmorillonite (1-5%wt), Nanofil2 and poly(caprolactane) as compatibilizing agent underwent surface analysis by means of Scanning Electron Microscopy. Afterwards they were exposed to UV radiation (254 nm) for a varied amount of time. The influence of radiation on surface layer properties of analyzed materials was determined by contact angle measurements before and just after exposition. Based on obtained results the surface free energy (SFE) was calculated using Owens-Wendt method. Determined values of SFE indicate that the type and quantity of used additives as well as the products of degradation formed during irradiation significantly influence SFE.