About
47
Publications
19,021
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
251
Citations
Introduction
Current institution
Additional affiliations
April 2019 - present
March 2009 - March 2019
Publications
Publications (47)
The paper deals with the influence of graphite solid additives, bisulphide of molybdenum and polytetrafluoroethylene on changes in shear stress values in lubricating greases. The research was done on lithium and bentonite greases. They were ‘pure’ greases — without any additives — and the compositions of these greases were with different amounts of...
As part of this research the thixotropy of lubricating greases based on mineral oil ORLEN OIL SN-400, thickened with lithium 12-hydroxystearate has been investigated. The investigations consisted in shearing grease samples in the rotational rheometer head for 1 h, followed by 24- h relaxation and again 1-h shearing, at a constant shear rate gradien...
As part of this research, the kinetics of soap grease thickener microstructure regeneration during 24-h relaxation after 1-h shearing were studied. A lubricating grease, based on mineral oil ORLEN OIL SN-400, containing associated molecules of lithium 12-hydroxystearate was subjected to analysis. Rheological dynamic oscillatory and FTIR–ATR (Fourie...
Purpose – The thixotropy of lubricating grease thickened with lithium 12-hydroxystearate with mineral base oil was investigated. The thixotropy has a significant influence on the flow resistance and pressure drop in the structural components of lubrication systems, which is of major importance as today the latter are being centralized and automated...
The study examined the influence of the mining environment on selected functional properties of two commercial greases thickened with lithium 12-hydroxystearate and overbased calcium sulfonate. The study conducted a comparative analysis of fresh greases and those that had been used in operation. The tests were performed in climatic conditions simil...
This study examines the effect of mining pollutants and wear products on the rheological and tribological properties of a lubricating grease working in the microclimate of the Polkowice-Sieroszowice mine belonging to the KGHM Polska Miedź Group (Polkowice, Poland). The material under investigation is a commercial lubricating grease thickened with c...
Using the detonation method, the shaft was filled with a gas mixture of C 2 H 2 /O 2 from 53 to 68 % and an alu-mina-based gradient coating was obtained on the surface of the substrate. The microstructure of the coatings was studied by scanning electron microscopic analysis. By increasing the proportion of α-Al 2 O 3 phase towards the surface layer...
The article examines the effect of annealing on the structure and properties of alumina-based coatings obtained by detonation spraying. Coated samples were kept separately at temperatures of 500, 700, 800 and 1200 °C at a pressure of 3.6*10-4 Pa for more than 1 hour. It was found that the microhardness of coatings made of alumina increases by 15-30...
This paper presents the results of experimental investigations of the physical and mechanical properties, structure and surface morphology of Al2O3- and ZrO2-based coatings deposited by detonation spraying. The coatings were sprayed onto titanium-alloyed steel 12Ch18N10T (GOST 4986-79). The thickness of the coatings ranged from 250 to 1100 μm. Afte...
The purpose of this experiment was to prepare high-voltage porcelain ceramics as local raw materials. Density, water absorption, and volume shrinkage were determined according to the State standard (GOST 7025-91). A structural analysis was carried out using a scanning electron microscope, and an X-ray phase analysis was carried out on an Xpert PRO...
![Fig. 1. Self-propelled loading vehicle [12].](profile/Tadeusz-Lesniewski/publication/344832417/figure/fig1/AS:949735603060737@1603446021814/Self-propelled-loading-vehicle-12_Q320.jpg)
![Fig. 2. Self-propelled drilling and anchoring vehicle Face Master 1.7 [13].](profile/Tadeusz-Lesniewski/publication/344832417/figure/fig2/AS:949735603068929@1603446021868/Self-propelled-drilling-and-anchoring-vehicle-Face-Master-17-13_Q320.jpg)
![Fig. 3. Diagram of central lubrication system [17].](profile/Tadeusz-Lesniewski/publication/344832417/figure/fig3/AS:949735603056642@1603446021912/Diagram-of-central-lubrication-system-17_Q320.jpg)
The paper presents problems related to the lubrication of moving machine nodes that are operating in an aggressive environment occurring in copper mines. The analysis was based on the exploitation of self-propelled wheeled machines, such as transport vehicles, loaders, drilling and anchoring cars. In self-propelled machines there are from 15 to 40...
The purpose of this experiment was to prepare high-voltage porcelain ceramics as local raw materials. Density, water absorption, and volume shrinkage were determined according to the State standard (GOST 7025-91). A structural analysis was carried out using a scanning electron microscope, and an X-ray phase analysis was carried out on an Xpert PRO...
The paper presents the results of preliminary studies into the influence of selected lubricants (greases) and the variable temperature of the friction joint on the value of friction during complex slide-roll motion. The experiment was carried out for three different types of lubricants: bentonite grease (Benterm 2), lithium grease (GREASEN ŁT4S2),...
The detailed information about the growth of organically modified silica networks regarded as useful for barrier coatings and membrane coatings preparation are the subject of this paper. The networks obtained using different precursors containing non-hydrolysable organic groups: dimethyldiethoxysilane – dMdEOS, ethyltriethoxysilane – EtEOS, n-propy...
The study evaluated the effect of temperature on the values of yield stress and cohesion energy of lubricating compounds thickened with calcium 12-hydroxystearate, prepared on the basis of mineral oil. Lubricating compounds without additives and with selected solid additives in the form of copper particles, graphite, molybdenum disulphide, and poly...
This paper presents the results of studies of wall effects in commercial soap-based greases LT4-S2 and HUTPLEX EP-2, thickened with, respectively, lithium 12-hydroxystearate and overbased calcium sulfonate. The studies were conducted in the presence of five different materials: copper alloy C11000, bronze B476, EPDM rubber and PTFE and PU thermopla...
In this study the flow of lubricating greases in a labyrinth seal geometry is studied using micro Particle Image Velocimetry (µPIV). The aim is to evaluate the grease velocity distribution inside the gap of a labyrinth seal and to find a relationship between the grease consistency and the transferred speed from the rotating ring in order to choose...
The results of the studies on the formation of surface and boundary layers in commercial lithium (LT4-S3) and calcium (STP) greases near the walls of six different materials are presented. Two elastomeric materials (nitrile-butadiene rubber (NBR), silicone rubber (MVQ/VMQ)), two thermoplastic materials (polyoxymethylene (POM), polyethylene (PE)), a...
W pracy przedstawiono wyniki badań wpływu temperatury na formowanie się warstw powierzchniowej i przyściennej w handlowym smarze plastycznych ŁT4-S2, w pobliżu ścianek wykonanych z sześciu różnych materiałów, tj. tworzyw elastomerowych (70E, 70F), tworzyw termoplastycznych (PTFE, PU) oraz stopów metali (B47, C11000). Badania przeprowadzono na reome...
Maszyny i urządzenia eksploatowane m.in. w Zagłębiu Miedziowym narażone są na ekstremalnie trudne warunki pracy (zapylenie, wilgotność, temperatura, obecność solanki oraz duże obciążenia udarowe), które powodują przyspieszone zużywanie tribologiczne i uszkodzenia wielu ruchowych węzłów tych maszyn i urządzeń. Istotnie wpływa to na koszty eksploatac...
This paper reports forming of the wall effect in two commercial soap greases in the vicinity of elastomers, termoplastics and metal alloys. The research was conducted using rotational rheometer, working in the plate-and-plate system. The rheological research shows that there is a dependence between the kind of adsorbent material and the structural...
W pracy opisano badania polietylenu PE-UHMW stosowanego m.in. na panewki endoprotez stawu biodrowego. Próbki materiału poddano tarciu ślizgowemu w ruchu przemiennym w kontakcie ze stalą kwasoodporną ANSI 316L. Badania polegały na pomiarze współczynnika tarcia statycznego badanej pary trącej przy różnych naciskach jednostkowych. Badaniom poddano pró...
W pracy zbadano wpływ udziału procentowego zagęszczacza litowego na właściwości reologiczne kompozycji smarowej w zakresie liniowej i nieliniowej lepkosprężystości. Podczas badań zastosowano dwa testy oscylacyjne: test przemiatania amplitudy odkształcenia oraz test przemiatania częstotliwości odkształcenia. Test przemiatania amplitudy umożliwia oce...
W opracowaniu przedstawiono wyniki badań doświadczalnych z zakresu modyfikowania warunków pracy węzłów tarcia trzema preparatami – dwoma wytwarzającymi na powierzchni elementów warstwę ceramiczną i jednym modyfikującym warstwę wierzchnią na drodze reakcji chemicznej. W ramach pracy przeprowadzono doświadczalne badania na standardowym aparacie czter...
In this paper the results are presented of measurements of electrical, mechanical and chemical properties of fresh and used aircraft engine oils. Oils were used in a four-stroke aircraft engine and their samples were taken after the 50-hour work of the engine. The resistivity, permittivity and viscosity of oils were measured as a function of temper...
W pracy przedstawiono badania właściwości adhezyjnych stali i polimerów w kontekście zastosowania ich na węzły tarcia. Najpowszechniejszą metodą oceny właściwości adhezyjnych ciał stałych jest pomiar kąta zwilżania. Pomiar kąta zwilżania został użyty do wyznaczenia swobodnej energii powierzchniowej stali i polimerów oraz pracy adhezji dla skojarzeń...
The paper deals with influence of thickener fraction on thixotropy of lubricating greases. The research was done on pure (without any additives) lithium greases thickened by lithium 12-hydroxystearate with mineral base oil. The results of the experiment showed that both the thickener fraction and shear rate have a significant influence on reconstru...
The paper deals with the problems connected with mechanical assistance to cardiovascular system by means of the pneumatically driven artificial ventricle POLVAD-MEV and, more precisely, the influence of the pump elements' compliance being placed directly in the front of the inflow valve (inlet compliance) and behind the outflow valve (outlet compli...
