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Tytuł:
Effects of Cutting Parameters on Quality of Surface Produced by Machining of Titanium Alloy and Their Optimization
Badanie i optymalizacja parametrów skrawania wpływających na jakość powierzchni uzyskaną przy obróbce stopów tytanu
Autorzy:
-, Niharika
Agrawal, B. P.
Khan, I. A.
Khan, Z. A.
Powiązania:
https://bibliotekanauki.pl/articles/950698.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
turning
titanium alloy
Response Surface Methodology
RSM
surface roughness
toczenie
stop tytanu
metodologia powierzchni odpowiedzi
chropowatość powierzchni
Opis:
Titanium alloy (Ti-6Al-4V) has been extensively used in aircraft turbine-engine components, aircraft structural components, aerospace fasteners, high performance automotive parts, marine applications, medical devices and sports equipment. However, wide-spread use of this alloy has limits because of difficulty to machine it. One of the major difficulties found during machining is development of poor quality of surface in the form of higher surface roughness. The present investigation has been concentrated on studying the effects of cutting parameters of cutting speed, feed rate and depth of cut on surface roughness of the product during turning of titanium alloy. Box-Behnken experimental design was used to collect data for surface roughness. ANOVA was used to determine the significance of the cutting parameters. The model equation is also formulated to predict surface roughness. Optimal values of cutting parameters were determined through response surface methodology. A 100% desirability level in the turning process for economy was indicated by the optimized model. Also, the predicted values that were obtained through regression equation were found to be in close agreement to the experimental values.
Stop tytanu (Ti-6Al-4V) jest szeroko stosowany do budowy elementów turbinowych silników lotniczych i innych podzespołów samolotów, elementów złącznych w technice lotniczej i astronautycznej, wysokiej jakości części samochodowych, w technice okrętowej i medycznej, a także w sprzęcie sportowym. Niemniej, powszechne zastosowanie tego stopu jest ograniczone trudnościami z jego obróbką. Jednym z podstawowych problemów jest niska jakość obrabianej powierzchni, która charakteryzuje się znaczną chropowatością. Przedstawiona praca jest poświęcona badaniu wpływu parametrów skrawania, takich jak szybkość skrawania, szybkość posuwu i głębokość skrawania na chropowatość powierzchni uzyskaną w procesie toczenia stopu tytanu. Przy zbieraniu danych nt. chropowatości powierzchni wykorzystano planowanie eksperymentu metodą Boxa-Behnkena. Do określenia poziomu istotności parametrów skrawania zastosowano metodę analizy wariancji, ANOVA. Sformułowano także równania modelu, pozwalającego przewidzieć chropowatość powierzchni. Optymalne wartości parametrów skrawania wyznaczono, stosując metodę powierzchni odpowiedzi (RSM). Wartości parametrów wyznaczone na podstawie równań regresji są bardzo bliskie wartościom uzyskanym eksperymentalnie.
Źródło:
Archive of Mechanical Engineering; 2016, LXIII, 4; 531-548
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study of transient elastohydrodynamic lubrication subjected to sinusoidal dynamic loads for rough contact surfaces
Autorzy:
Abd-Alsamieh, Mohamed F.
Powiązania:
https://bibliotekanauki.pl/articles/2106001.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
transient elastohydrodynamics
surface roughness
sinusoidal load
wavy surface
Opis:
The purpose of this paper is to study the behaviour of transient elastohydrodynamic contacts subjected to forced harmonic vibrations, including the effect of surface waviness for concentrated counterformal point contact under isothermal conditions. Profiles of pressure and film thickness are studied to reveal the combined effects of sinusoidal external load and surface roughness on the lubrication problem. The time-dependent Reynolds' equation is solved using Newton–Raphson technique. The film thickness and pressure distribution are obtained at different snap shots of time by simultaneous solution of the Reynolds’ equation and film thickness equation including elastic deformation and surface waviness. It is concluded that the coupling effects of the transient sinusoidal external load and wavy surface would result in increase in modulations of the pressure and film thickness profile in comparison to the case where the smooth contact surfaces are subjected to sinusoidal external load.
Źródło:
Acta Mechanica et Automatica; 2022, 16, 2; 162--168
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the compromise between cutting tool life, productivity and roughness during turning of C45 hardened steel
Autorzy:
Abidi, Youcef
Powiązania:
https://bibliotekanauki.pl/articles/1839561.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
obróbka twarda
zużycie narzędzi
produktywność
chropowatość powierzchni
korelacja
hard machining
tool wear
productivity
surface roughness
correlation
Opis:
Tool wear and surface roughness as performance indexes are considered to be the most important in terms of hardened materials’ machinability. The best combination of cutting parameters which enhances the compromise between tool life, productivity and machined surface quality contribute to benefice on production cost, which makes manufacturing industry interested in it. The aim of this research is to investigate the life of ceramic cutting tool and machining productivity together with surface roughness during turning of hardened steel C45, with focus on the selection of the optimal cutting parameter combination. The experiments are carried out based on uni-factorial planning methodology of cutting speeds and feed rates. The results show that the mixed ceramic tool is suitable for turning hardened steel C45 (40 HRC) and the conclusion is that it performed well in terms of tool life, productivity and surface quality at a combination of cutting speed (200 m/min), feed (0.08 mm/rev) and depth of cut (0.3 mm). Additionally, a tool life model has been proposed which is presented very high coefficient of determination.
Źródło:
Production Engineering Archives; 2021, 27, 1; 30-35
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between surface roughness and chip morphology when turning hardened steel
Autorzy:
Abidi, Youcef
Powiązania:
https://bibliotekanauki.pl/articles/1839509.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
hard machining
AISI 1045 steel
ceramic tool
chip
surface roughness
obróbka twarda
stal AISI 1045
narzędzie ceramiczne
żeton
chropowatość powierzchni
Opis:
Hard machining is a process which has become highly recommended in manufacturing industry to replace grinding and perform production. The important technological parameters that determine this process are tool wear, machined surface roughness, cutting force and morphology of the removed chip. In this work, an attempt has been made to analyse the morphology and form of chip removed during turning of hardened steel AISI 1045 (40HRC) with mixed ceramic tool type CC650. Using a Taguchi plan L9, whose factors are cutting speed and feed rate with three levels for each. Macroscopic and microscopic results of chip morphology were correlated with these two cutting parameters additional to surface roughness. Sufficient experimental results were obtained using the mixed ceramic tool when turning of hardened steel AISI 1045 (40HRC) at high cutting speeds. Roughness of machined surface confirmed that it is influenced by feed rate. Chips show a sawtooth shape for all combinations of the experimental plan used. The chip form changed with cutting parameters variation and given an important indicator of suraface quality for industriel. Having the indicators on the surface quality from simple control of chip without stopping machining give an important advantage in order to maximize production and reduce costs.
Źródło:
Production Engineering Archives; 2020, 26, 3; 92-98
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of abrasive grit size on roughness of sanded beech wood surface
Autorzy:
Adamcik, Lukas
Kminiak, Richard
Dudiak, Michał
Banski, Adrian
Powiązania:
https://bibliotekanauki.pl/articles/24072437.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
surface roughness
belt sander
beech wood
Keyence VHX
digital microscopy
Opis:
The study assessed the changing of Ra, Rp, Rv and Rz roughness parameters of the sanded beech surface (Fagus sylvatica L.) as a function of different grit sizes and different measurement direction. The milled samples were ground with a belt sander BS-75 E-set from Festool with belt grit P60, P100 and P150. The sanding belts were Rubin 2 from Festool. Roughness was evaluated using a Keyence VHX-7000 digital microscope. The evaluation length of the roughness measurement was 12.5 mm (λc = 2.5 mm and λs = 8 mm). The R-parameters were measured in accordance with the latest standards ISO 21920 (2022) in the direction parallel to the grain, and in the direction perpendicular to the grain (profile). The paper proves the theoretical assumptions about the reduction of R-parameter values. The measurements showed that the sanded surface was less rough in the direction perpendicular to the grain at P150 sanding belt grit and in the grain direction at P100 grit.
W pracy oceniono zmianę parametrów chropowatości Ra, Rp, Rv i Rz szlifowanej powierzchni buka (Fagus sylvatica L.) w funkcji różnej wielkości ziarna i kierunku pomiaru. Zmielone próbki szlifowano szlifierką taśmową BS-75 E-set firmy Festool o ziarnistościach taśmowych P60, P100 i P150. Taśmy szlifierskie to Rubin 2 firmy Festool. Chropowatość oceniano przy użyciu mikroskopu cyfrowego Keyence VHX-7000. Długość ewaluacyjna pomiaru chropowatości wynosiła 12,5 mm (λc = 2,5 mm i λs = 8 mm). Parametry R zostały zmierzone zgodnie z najnowszymi normami ISO 21920 (2022) w kierunku równoległym do włókien oraz w kierunku prostopadłym do włókien (profil). Artykuł potwierdza teoretyczne założenia dotyczące redukcji wartości parametru R. Pomiary wykazały, że szlifowana powierzchnia była mniej chropowata w kierunku prostopadłym do włókien przy ziarnistości taśmy ściernej P150 oraz w kierunku włókien przy ziarnistości P100.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2023, 121; 51--60
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear and surface characteristics on tool performance with CVD coating of Al2O3/TiCN inserts during machining of Inconel 718 alloys
Autorzy:
Agari, Shailesh Rao
Powiązania:
https://bibliotekanauki.pl/articles/2065755.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chip morphology
tool wear
surface roughness
superalloy
Inconel 718
zużycie narzędzia
chropowatość powierzchni
nadstop
Opis:
The Inconel 718 alloys, which are primarily temperature resistant, are widely used in aviation, aerospace and nuclear industries. The study on dry cutting processes for this alloy becomes difficult due to its high hardness and low thermal conductivity, wherein, most of the heat transfers due to friction are accumulated over the tool surface. Further, several challenges like increased cutting force, developing high temperature and rapid tool wear are observed during its machining process. To overcome these, the coated tool inserts are used for machining the superalloys. In the present work, the cemented carbide tool is coated with chemical vapor deposition multi-layering Al 2O 3/TiCN under the dry cutting environment. The machining processes are carried out with varying cutting speeds: 65, 81, 95, and 106 m/min, feed rate 0.1 mm/rev, and depth of cut 0.2 mm. The variation in the cutting speeds can attain high temperatures, which may activate built-up-edge development which leads to extensive tool wear. In this context, the detailed chip morphology and its detailed analysis are carried out initially to understand the machining performance. Simultaneously, the surface roughness of the machined surface is studied for a clear understanding of the machining process. The potential tool wear mechanism in terms of abrasion, adhesion, tool chip off, delaminating of coating, flank wear, and crater wear is extensively identified during the processes. From the results, it is observed that the machining process at 81 m/min corresponds to a better machining process in terms of lesser cutting force, lower cutting temperature, better surface finish, and reduced tool wear than the other machining processes.
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 1; 59--75
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of acidic saliva on monomer leaching and surface roughness of 3D-printed and milled denture-base materials
Wymywanie monomerów wywołane przez kwaśną ślinę oraz chropowatość powierzchni drukowanych w 3D i frezowanych materiałów dentystycznych
Autorzy:
Al-Otaibi, Hanan
Basaqer, Rafal
Almania, Sarah
Alfouzan, Afnan
Al Taweel, Sara
Alshehri, Huda
Labban, Nawaf
Powiązania:
https://bibliotekanauki.pl/articles/24202785.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
polymethyl methacrylate
CAD/CAM milling
3D-printed
monomer leaching
surface roughness
salivary pH
polimetakrylan metylu
frezowanie CAD/CAM
druk 3D
wymywanie monomerów
chropowatość powierzchni
pH śliny
Opis:
The study evaluated the effect of different acidic salivary pH values on monomer leaching and surface roughness of conventional and CAD/CAM processed (milled and 3D-printed) denture base materials. High-performance liquid chromatography was used to determine the quantity of residual methyl methacrylate monomer leaching after 30 days of immersion in acidic saliva. The surface roughness (Ra) before and after incubation was recorded using a non-contact optical profilometer. The monomer leaching and the surface roughness of the tested materials depended on the pH value of the saliva. The conventional denture framework material exhibited the highest and lowest leaching rates at pH=4.5 and pH=3.5, respectively, regardless of the treatment method. Among the CAD/CAM processed materials, the 3D-printed material showed the highest and lowest leaching at pH=5.5 and pH=3.5, respectively. Regardless of the pH, roughness after incubation was the lowest for conventional materials, and the highest for 3D printing.
W pracy oceniono wpływ pH śliny na wymywanie monomerów i chropowatość powierzchni konwencjonalnych oraz wytworzonych metodą CAD/CAM (frezowanych i wydrukowanych w 3D) materiałów na podbudowy protez dentystycznych. Metodą wysokosprawnej chromatografii cieczowej oznaczono ilość wymytego monomeru (metakrylan metylu) po 30-dniowym zanurzaniu w kwaśnej ślinie. Chropowatość powierzchni (Ra) przed i po inkubacji rejestrowano za pomocą bezkontaktowego profilometru optycznego. Wymywanie monomerów oraz chropowatość powierzchni badanych materiałów zależały od wartości pH śliny. Konwencjonalny materiał na podbudowę protezy wykazywał największy i najmniejszy stopień wymywania odpowiednio przy pH=4,5 i pH=3,5, niezależnie od sposobu obróbki. Spośród materiałów poddanych obróbce CAD/CAM, materiał drukowany wykazał największe i najmniejsze wymywanie przy odpowiednio pH=5,5 i pH=3,5. Niezależnie od pH, chropowatość po inkubacji była najmniejsza w przypadku materiałów konwencjonalnych, a największa otrzymanych metodą druku 3D.
Źródło:
Polimery; 2023, 68, 3; 149--156
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ridge geometry effect on the behavior of elastohydrodynamic lubrication of point contact problem
Autorzy:
Al-Samieh, Mohamed F. Abd
Powiązania:
https://bibliotekanauki.pl/articles/1845008.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface roughness
transverse ridge
elastohydrodynamics
amplitude
chropowatość powierzchni
elastohydrodynamika
amplituda
Opis:
A numerical solution is presented to investigate the influence of the geometry and the amplitude of the transverse ridge on the characteristics of elastohydrodynamic lubrication for point contact problem under steady state condition. Several shapes of ridges with different amplitudes are used in the stationary case, such as flat-top ridge, cosine wave ridge and sharp ridge of triangular shape. Results of film thickness and pressure distributions of the aforementioned ridge feature are presented at different locations through an elastohydrodynamically lubricated contact zone for different amplitude of the ridge. Simulations were performed using the Newton-Raphson iteration technique to solve the Reynolds equation. The numerical results reveal that, to predict optimum solution for lubricated contact problem with artificial surface roughness, the geometrical characteristics of the ridge should have profiles with smooth transitions such as those of a cosine wave shape with relatively low amplitude to reduce pressure spike and therefore cause the reduction in the film thickness. The position of the location of the ridge across the contact zone and the amplitude of the ridge play an important role in the formation of lubricant film thickness and therefore determine the pressure distribution through the contact zone.
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 4; 491-508
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Corners Milling of Aluminum Alloy Elements
Autorzy:
Anasiewicz, K.
Włodarczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/2065028.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
aluminum machining
surface roughness
machining strategy
Opis:
The article presents comparative research on the effects of milling of concave corners of elements made of aluminum alloy 7075. The work focuses on the study of the impact of changes in technological parameters and types of machining on the obtained geometrical state of the machined samples. Correct milling of the corners requires selection of the appropriate feed rate and the proper engagement angle of the milling cutter. At the corners, tool engagement angle increases, which significantly hinders the execution of stable machining and adversely affects the geometric and qualitative characteristics of the surface in the corners. Study with application of various strategies and technological parameters of milling corners with variable opening angles were carried out. The main parameters of surface roughness of the machined elements were examined. When analyzing the results obtained, conclusions were formulated indicating the relationship between the change of selected technological parameters, with the assumed type of treatment, and the obtained quality parameters of the samples made.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 33--39
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser-scanner used in a wind tunnel to quantify soil erosion
Autorzy:
Asensio, C.
Weber, J.
Lozano, F.J.
Mielnik, L.
Powiązania:
https://bibliotekanauki.pl/articles/2082510.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil roughness
tilled soils
wind erosion
soil
loss
Opis:
A methodology was developed in order to estimate wind erosion by comparing the differences in soil loss with a 3D laser scanner inside a wind tunnel, to relate the change in soil micro-relief to soil loss. We evaluated the effectiveness of a low-cost laser scanner in a wind tunnel for examining the winddependent variation in soil surface micro-topography, thereby enabling soil wind erosion to be quantified both quickly and accurately. We, therefore, studied the effect of soil crusting in an intensive horticultural crop, low-tilled soil (once a year) in cereal cultivation, and tilled soil (several times a year) in an ecological citrus orchard, paying attention to the changes occurring when soils are tilled. Moreover, we observed an aggregation effect of CaCO3 in the wind-erodible fraction, a protective effect of surface stoniness against a direct impact of wind and the incidence of soil particle content. Different behaviour, in terms of random roughness, is due to more stones and/or remnant vegetation being highly resistant to wind in Calcisol, Cambisol, Fluvisol and Arenosol plots, thus increasing surface roughness. In Anthrosol and Leptosol plots, on the contrary, initial roughness was due to large unstable and wind-eroded aggregates which resulted in a decreased surface roughness.
Źródło:
International Agrophysics; 2019, 33, 2; 227-232
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The grooved lip effect on reciprocating hydraulic rod seal performances in transient condition: elastohydrodynamic lubrication
Autorzy:
Bahi, Y.
El Gadari, M.
Rahmoune, M.
Powiązania:
https://bibliotekanauki.pl/articles/264834.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
chropowatość
siła tarcia
wyciek
hydraulic rod seal
surface textured
roughness
friction force
leakage
Opis:
It is commonly known that the sealing performance of dynamic seals is significantly influenced by the surface finish. To reduce friction effect and leakage ratio, new generations of grooved lip or shaft have emerged, but only two computational models were performed up to now with a textured elastomeric lip: spiral groove in the axial direction or micro-cavities according to the circumferential direction. However, if the numerical results have confirmed the slight effect of the grooved lip on the rotary lip seal performances, it seems relevant to investigate the influence of such grooves on the reciprocating hydraulic rod seal behavior. Thus, the scope of this work is to perform a parametric study of the grooved lip throughout a one-dimensional elastohydrodynamic model by taking into account the elasticity of the lip and the shaft roughness. After confirming the validity of the current model, numerical simulations have been performed and compared with experiments. The effect of lip grooves on the hydraulic rod seal behavior in outstroke and instroke shaft motion has been underlined. Thereby, it is shown that the leakage and the average film thickness are sensible to both the depth and the density of the lip groove. Additionally, a slight effect of the pattern shape is observed on the friction force.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 2; 11-21
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Roughness effects of textured surfaces in hydrodynamic lubrication
Autorzy:
Bahi, Youssef
El Gadari, Mhammed
Rahmoune, Miloud
Powiązania:
https://bibliotekanauki.pl/articles/2174176.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
tekstura
chropowatość
tarcie
ciśnienie
finite difference
texture
roughness
HD pressure
lifting force
friction
leakage
Opis:
Several studies have been conducted to improve and model the lubricated contact between surfaces. The main subjects were defining the hydrodynamic parameters to reduce energy losses and protect the environment. Some of the proposed models have studied the effect of textures in hydrodynamic lubrication and have proved that adapted shapes and geometries can improve the performance of lubricated contacts. A hydrodynamic model was developed by assuming the roughness of the textured surface and considering the cavitation in a steady-state regime. The proposed model was validated and compared with the analytical model of Fowell et al. [1]. Three different textures shapes were considered. The results showed that the rough-textured thrust affects the hydrodynamic performance significantly. Thus, by increasing the arithmetic roughness of textured surfaces, the hydrodynamic pressure, and the lifting force increase depending on the texture shape. A rougher surface slightly increases the friction force for the three considered textures.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 9--21
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of particle size on surface roughness and morphology of heat-treated electroless Ni-YSZ coating
Autorzy:
Bahiyah Baba, N.
Ghazali, A. S.
Azinee, S. N.
Abdul Rahman, A. H.
Sharif, S.
Powiązania:
https://bibliotekanauki.pl/articles/2201055.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
particle size
electroless coatings
Ni-YSZ
heat treatment
surface roughness
surface morphology
wielkość cząstek
powłoka
powlekanie bezprądowe
obróbka cieplna
chropowatość powierzchni
morfologia powierzchni
Opis:
Purpose The paper discusses the surface characterisation of electroless nickel-yttria-stabilised zirconia (Ni-YSZ) coating with varying YSZ particle sizes and undergoes heat treatment at a temperature between 300-400°C for 1-2 hours for wear resistance purposes. This finding will be helpful to the application of Ni-YSZ as an alternative coating for cutting tools. Design/methodology/approach The surface characterisation was analysed using JOEL Scanning Electron Microscope (SEM) coupled with Energy Dispersive X-ray (EDX) JSM 7800F. The crystallographic structure of materials was analysed by X-ray diffraction (XRD) Bruker D8 Advance instrument. The Ni-YSZ coating was deposited using electroless nickel co-deposition of 8YSZ ceramic particles with a nano, mixed and microparticle sizes onto a high-speed steel (HSS) substrate. The coatings were heat treated at temperature 300-400°C and time 1-2 hours. The surface roughness was measured using Mitutoyo surface roughness tester SJ-301. Findings The electroless Ni-YSZ coating deposited has an average thickness of 30 µm. It is found that the coating morphology electroless coating without YSZ particle incorporation (EN) and Ni-YSZ nano (N) is smoother compared to the Ni-YSZ mixed (NM) and Ni-YSZ micro (M). The EDS composition analysis shows the YSZ content in the electroless Ni-YSZ coating for N samples is the lowest, whereas NM samples are the highest. This resulted in the surface roughness behaviour where the mixed-size YSZ particle gives the highest roughness at all temperatures. The XRD analysis shows that heating temperatures above 300°C caused the precipitation of Ni3P crystalline. Research limitations/implications Previous studies in the surface characterisation of electroless nickel composite are scarce; thus, the study has limitations in finding supporting data. Originality/value The surface characterisation especially related to the surface roughness of the electroless nickel, either the Ni-P or composites or alloys are rarely reported. Thus, this study enlightened the effect of particle size on surface roughness and morphology of heat-treated coatings.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 114, 1; 5--14
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economic analysis of artificially roughened solar air heater with v-shaped ribs
Autorzy:
Bahuguna, Rahul
Chamoli, Sunil
Barthwal, Yogesh
Rana, Sumit
Gupta, Ashutosh
Bisht, Vijay Singh
Powiązania:
https://bibliotekanauki.pl/articles/2142836.pdf
Data publikacji:
2022
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
solar air heater
heat transfer
artificial roughness
economic analysis
life cycle savings
powietrzny kolektor słoneczny
wymiana ciepła
sztuczna chropowatość
analiza ekonomiczna
oszczędności w cyklu życia
Opis:
Due to the minimal transfer of heat from absorber plate to moving air in the duct, solar air heaters have low performance. One of the procedures to augment the heat transfer by substantial amount is by utilizing artificial roughness, by which the performance can be improved considerably. In this study, an economic investigation of solar air heater embedded with artificial roughness is accomplished numerically employing v-shaped roughness, with the objective of optimising life cycle solar savings. The non-dimensional parameters of roughness, namely, angle of attack (α), roughness pitch (p/e) and roughness height (e/Dh) are examined by varying temperature rise over the solar air heater (∆T) and solar radiations (I) for different economic parameters values i.e., cost of collector, cost of roughness elements, and cost of conventional fuel.
Źródło:
Acta Innovations; 2022, 44; 18-33
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ warunków smarowania na zmiany struktury geometrycznej powierzchni elementów łożysk tocznych
The effect of lubrication on surface roughness change of rolling bearing elements
Autorzy:
Bak, M.
Libera, M.
Jósko, M.
Powiązania:
https://bibliotekanauki.pl/articles/189988.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
łożyska toczne
smarowanie
struktura geometryczna powierzchni
rolling bearings
lubrication
surface roughness
Opis:
W artykule podjęto zagadnienie eksploatacyjnej warstwy wierzchniej węzłów tocznych. Przedstawiono badania zmian struktury geometrycznej powierzchni elementów łożysk tocznych, w efekcie pracy na stanowisku, na którym węzeł trący jest modelem walcowego łożyska tocznego (STBL-02). Badania przeprowadzono na trzech grupach wałeczków łożyskowych, które pracowały w odmiennych warunkach smarowania. W konsekwencji stwierdzono istotny wpływ warunków smarowania na przebieg zmian wartości parametrów struktury geometrycznej powierzchni.
The paper considers the problem of surface layer change during work. The recent studies of changes in roughness structure of bearing elements surface are the result of work on the STBL-02 tester (where the friction pair is a model of a cylindrical roller bearings). The study was conducted on three groups of roller bearings, which worked in different conditions of lubrication. It was therefore considered an important influence of lubrication on the changes of the surface roughness parameters. Analysing the test results, it can be stated that, for the rollers working in conditions of fluid friction, the Rvk and Rpk parameters increase with time, and for the rollers working in boundary friction, the initial value of these parameters decreased in the formation of the equilibrium roughness.
Źródło:
Tribologia; 2012, 4; 11-16
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 545

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