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Tytuł:
Interaction between sphalerite and pyrite and its effect on surface oxidation of sphalerite
Autorzy:
Yang, B.
Xie, X.
Tong, X.
Lan, Z.
Cui, Y.
Powiązania:
https://bibliotekanauki.pl/articles/109553.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sphalerite
surface oxidation
minerals interaction
DFT
Opis:
The interaction between sphalerite and pyrite was investigated by dissolution test, X-ray photoelectron spectroscopy (XPS), zeta potential measurement and density functional theory (DFT) calculation. Dissolution tests indicated that sphalerite dissolution was promoted due to the galvanic interaction between sphalerite and pyrite. The Zn2+ ion concentration increased with increasing pyrite content and dissolved time. XPS analysis results demonstrated that a new oxidation product was formed on the sphalerite surface in the presence of pyrite in a pulp. Zeta potential measurements showed that the isoelectric point of sphalerite increased from 3.3 to 5.4 due to galvanic interaction. DFT calculation results suggested that electron transfer from sphalerite to pyrite occurred when they contacted. The Zn 4s and S 3p states of sphalerite lost electrons. The Fe 4p and 4s of pyrite states obtained electrons, and Fe 3d and S 3s states lost a small number of electrons. The surface oxidation of sphalerite was promoted due to the interaction with pyrite, and the collectorless floatability of sphalerite decreased.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 311-320
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of pyrite type on the electrochemistry of chalcopyrite/pyrite interactions
Autorzy:
Forbes, E.
Smith, L.
Vepsalainen, M.
Powiązania:
https://bibliotekanauki.pl/articles/110218.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
arsenic
pyrite
galvanic interaction
Surface oxidation
Opis:
Pyrite is the most common sulphide gangue mineral occurring in base metal sulphide ores around the world. Pyrite is known to galvanically interact with valuable minerals such as chalcopyrite, altering their electrochemical and flotation behaviour. Different types of pyrite are known to vary in texture, chemical composition and electrochemical activity. However, the effect that these differences have on the degree of pyrite interaction with chalcopyrite are not well studied. This work examines two distinct types of pyrite from different deposits that have a similar chemical composition, but vary greatly in texture. It investigates the way in which these pyrites interact with chalcopyrite surfaces, affecting both its electrochemical behaviour and floatability. It was found that the Renison pyrite was characterised by a much higher level of surface activity than the Huanzala pyrite. This was attributed to the elevated levels of arsenic within the mineral’s crystalline matrix.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1117-1129
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of particle size on the oxidation and flotation behavior of galena particles
Autorzy:
Lu, Yalin
Tong, Xiong
Xie, Xian
Yang, Bo
Hua, Zhongbao
Powiązania:
https://bibliotekanauki.pl/articles/110497.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
galena
particle size
surface oxidation
flotation behavior
Opis:
The aim of this study was to determine the effect of particle size on the oxidation and flotation behavior of galena particles. Coarse (-0.074+0.038 mm), intermediate (-0.038+0.025 mm) and fine (-0.025 mm) galena particles were used in this study. Dissolution tests demonstrated that the amount of oxidation products increased with the decrease of particle sizes. The surface oxidization of galena was the greatest at pH 7.3, followed by pH 12 and 9, which were consist with the result of XPS. The micro-flotation results indicated that the effect of pH on the flotation recovery of galena enhanced with the reduction of particle sizes. The decreasing of particle sizes increases both the sorption rate of collector and the dissolution of galena, while the generation of hydrophilic product caused by dissolution is dominant, rendering the mineral hydrophilic. This study shows the differences in the surface oxidation and flotation behavior of different size fractions of galena particles. To promote the flotation recovery of the fine size fraction of galena particles, alleviating their oxidation is the key.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 208-216
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flotation separation of enargite from complex copper concentrates by selective surface oxidation
Autorzy:
Li, Tangfei
Zhang, Yansheng
Zhang, Bo
Jiao, Fen
Qin, Wenqing
Powiązania:
https://bibliotekanauki.pl/articles/110698.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
mineralogy
enargite
selective surface oxidation
froth flotation
EDTA extraction
Opis:
In previous study, the promising results of separating enargite from non-arsenic copper sulfides were obtained using selective surface oxidation in pure mineral systems. However, this technology was not well understood in real ores or concentrates. In this study, the flotation separation of enargite from complex copper concentrates by selective surface oxidation was investigated. The effects of regrinding, pulp pH, NaClO concentration, conditioning time and flotation time on separation of enargite from NECu minerals were studied. The mineralogical characteristics of the flotation feed and products were showed as an instructive tool to understand the separation results. According to the results of EDTA extraction, the possible mechanism for separation of enargite from NECu minerals is that enargite is more resistant to oxidized compared to NECu minerals. The following order for the oxidation of NECu minerals and enargite is obtained: chalcopyrite (chalcocite, digenite)> enargite (covellite).
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 4; 852-864
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Electrochemical Anodizing Parameters on the Microstructure, Microroughness and Microhardness of Anodized Ti-6Al-7Nb
Autorzy:
Veselinov, Deyan
Skulev, Hristo
Powiązania:
https://bibliotekanauki.pl/articles/351823.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
anodizing
surface oxidation
electrochemical
titanium alloy
Ti-6Al-7Nb
Opis:
This paper presents a study on anodizing titanium alloy Ti-6Al-7Nb in electrolyte of dilute sulfuric acid. The effects of the parameters – voltage, anodizing time, and electrode distance on the anodic film properties have been investigated. The anodic layers are found to become more compact with the increase of the applied voltage in the electrolytic cell. The microstructure, chemical element distribution and mechanical properties, i.e. microroughness and microhardness of the anodic coatings obtained at different operating conditions have been evaluated.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1223-1226
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferrite Decarburization of High Silicon Spring Steel in Three Temperature Ranges
Autorzy:
Zhao, F.
Zhang, C. L.
Liu, Y. Z.
Powiązania:
https://bibliotekanauki.pl/articles/350822.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface decarburization
steel
oxidation
carbon diffusion
Opis:
Surface decarburization of high silicon spring steel in ambient air was studied. The experimental results confirmed the decarburized mechanism under AC1 temperature, in the temperature range of AC1-AC3 and AC3-G. Under AC1 temperature, pearlite spheroidization and surface decarburization are carried out simultaneously and pearlite spheroidization is reinforced. Considering the oxidation loss depth, the “true ferrite decarburized depth” at 850 °C (AC3-G) is still smaller than that at 760°C (AC1-AC3). That is because an “incubation period” must pass away before ferrite decarburization occurs in the temperature range of AC3-G, and the ferrite decarburized rate is limited to being equal to the partial decarburized rate.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1715-1722
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of oxidation roasting on ilmenite flotation
Autorzy:
Mehdilo, A.
Irannajad, M.
Rezai, B.
Powiązania:
https://bibliotekanauki.pl/articles/109387.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
ilmenite
oxidation roasting
surface chemistry
zeta potential
Opis:
In this study, the oxidation roasting was used to modify the ilmenite chemistry to improve the collector adsorption and ilmenite flotation behavior. The results indicated that the increase of the roasting temperature up to 600 ºC increased the ilmenite flotation recovery. The maximum collector adsorption density occurred on ilmenite roasted at 600 °C which resulted in the increase of ilmenite flotation recovery from 73.5% to 91% at pH 6.3. This improvement was attributed to a greater conversion of Fe2+ to Fe3+ ions and significant decrease in the zeta potential of ilmenite. At the roasting temperatures of 750 °C and 950 °C, ilmenite was converted to rutile and some trivalent iron containing phases such as hematite and pseudobrookite. Under these conditions, the collector adsorption and hence ilmenite flotation improved, however the flotation recovery decreased after the roasting at 950 °C.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 493-505
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gold Recovery from Cyanidation Tailings Using Flotation Process
Autorzy:
Zhongsheng, Huang
Tianzu, Yang
Powiązania:
https://bibliotekanauki.pl/articles/2048871.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gold
cyanidation tailings
surface repair regeneration
flotation
bio-oxidation
Opis:
The gold recovery from cyanidation tailings was only 4.01% with the general flotation process, the surface analyses of flotation products were performed, and the results showed that the poor gold recovery with general flotation process was due to the passive films covering the surface of the gold bearing pyrite. These films are mainly hydrophilic hydroxides of Ca, Fe and Mg, at the same time, the depression of CN– to pyrite flotation in the flotation slurry was also a main contributing factor. With the surface repair regeneration procedures, it was proven that sulfuric acid pretreatment plays a dominant role in the removing and cleaning of passive films, while destroying free cyanides in the slurry. Sodium carbonate was then used as a buffering pH modifier and as a slurry dispersant after sulfuric acid pretreatment. The gold recovery was as high as 93.41%, compared to the original gold recovery of 4.01%.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 37-43
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary studies of photolysis and TiO2-montomorillonite-immobilised photocatalysis processes for the degradation of organic pollutants in water treatment
Autorzy:
Pamuła, Justyna
Karnas, Magdalena
Styszko, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/2172915.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
surface waters
water contamination
advanced oxidation processes
biological oxygen demand
Opis:
Organic compounds are the most diverse group of contaminants. The largest anthropogenic source of these contaminants in water is municipal and industrial wastewater. One of the indicators of surface water pollution is biological oxygen demand (BOD). Purifying water from organic micropollutants is a serious challenge and requires the development of newer and more effective methods. The removal of such contaminants is most effective only in advanced oxidation processes (AOP), which include UV photolysis and photocatalysis. The presented results are from preliminary research to evaluate the effectiveness of water treatment by ultraviolet (UV) photolysis and photocatalysis. Treatment efficiency was evaluated on the basis of changes in the BOD index before and after the advanced oxidation process of raw water. The values of the BOD5 index determined in accordance with PN-EN 25813:1997. The exposure time of the samples was a maximum of 60 minutes. The tested material was water samples taken from the Rudawa River, which is one of the drinking water sources for Krakow. The initial BOD5 value (expressed as concentration of O2) for all samples was about 8 mg/L but it has decreased to over 2 mg/L due to AOP processes. This means that after an hour, more than 75% of organic compounds present in the raw water were removed. For photocatalysis (TiO2-MMT), the exposure time of the samples was a maximum of 35 minutes. Water samples taken from the Rudawa River were also used as test material. The initial BOD5 value for all samples was about 9 mg/L but it has decreased to about 4 mg/L due to the photocatalysis process. This means that after 35 minutes, 55% of the organic compounds present in the raw water were removed.
Źródło:
Geology, Geophysics and Environment; 2022, 48, 4; 393--404
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of Petroleum Refinery Wastewater by Graphite–Graphite Electro Fenton System Using Batch Recirculation Electrochemical Reactor
Autorzy:
Kassob, Ali Nadhum
Abbar, Ali Hussein
Powiązania:
https://bibliotekanauki.pl/articles/2202176.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
advanced oxidation process
COD removal
electro-Fenton
porous graphite
response surface methodology
Opis:
Water pollution and the lack of access to clean water are general global problems that result from the expansion of industrial and agricultural activities. Petroleum refinery wastewaters are considered as a major challenge to the environment and their treatment is mandatory. The present work investigated the removal of chemical oxygen demand (COD) from petroleum refinery effluents generated from the Al-Dewaniya petroleum refinery plant located in Iraq by utilizing a novel graphite–graphite electro-Fenton (EF) system. The electrochemical reactor was a tubular type with a cylindrical cathode made from porous graphite and concentric porous graphite rode acts as an anode. By adopting the response surface methodology (RSM), the impacts of different operating variables on the COD removal were investigated. The optimal conditions were a current density of 25 mA/cm2, FeSO4 concentration of 1.4 mM, and electrolysis time of 90 minutes, which resulted in the COD removal efficiency (RE%) of 99% at a specific energy consumption (SEC) of 10.34 kWh/kg COD. The results indicated that both current density and concentration of FeSO4 have a major impact on the elimination of COD, while time has a minor effect. The adequacy of the model equation was demonstrated by its high R2 value (0.987). The present work demonstrated that the graphite–graphite EF system could be considered as an effective approach for removing of COD from petroleum refinery wastewaters.
Źródło:
Journal of Ecological Engineering; 2022, 23, 10; 291--303
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of NiCrAlY Coatings Roughness on Oxidation Kinetics During Static Oxidation Test at Temperature 1000ºC And 1100ºC
Wpływ przygotowania powierzchni na kinetykę utleniania warstw typu NiCrAlY pod wpływem statycznego utleniania w temperaturze 1000ºC i 1100ºC
Autorzy:
Niemiec, D.
Moskal, G.
Jasik, A.
Powiązania:
https://bibliotekanauki.pl/articles/353011.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
NiCrAlY coatings
oxidation kinetics
surface condition
powłoka NiCrAlY
kinetyka utleniania
stan powierzchni
Opis:
The article presents the results of research related to the impact of pretreatment plasma sprayed NiCrAlY coating on the kinetics of the oxidation. The analysis covered the shell subjected to thermal spraying. The test were performed at a temperature of 1000ºC and 1100ºC the samples were removed from the furnace after 25, 300, 500, 750 and 1000 hours. The investigations range included analysis of top surface of coatings by XRD characterization oxides formed types and microscopic investigations of coatings morphology.
W artykule zaprezentowano wyniki badań odnoszące się do wpływu przygotowania powierzchni natryskanej plazmowo powłoki NiCrAlY na kinetykę jej utleniania. Analiza obejmowała powłoki poddane natryskiwaniu cieplnemu. Testy wykonano w temperaturze 1000ºC i 1100ºC próbki zostały wyjęte z pieca po 25, 300, 500, 750 i 1000 godzinach. Przy analizie stanu warstwy wierzchniej powłok wykorzystano badania dyfrakcyjne określające skład fazowy i badania mikroskopowe umożliwiające ocenę budowy warstwy.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 4; 2671-2680
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Textural, surface, thermal and sorption properties of the functionalized activated carbons and carbon nanotubes
Autorzy:
Nowicki, P.
Szymanowski, W.
Pietrzak, R.
Powiązania:
https://bibliotekanauki.pl/articles/779561.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
carbonaceous adsorbents
oxidation
nitrogenation
surface functional groups
thermogravimetric study
adsorption from liquid phase
Opis:
Two series of functionalised carbonaceous adsorbents were prepared by means of oxidation and nitrogenation of commercially available activated carbon and multi-walled carbon nanotubes. The effect of nitrogen and oxygen incorporation on the textural, surface, thermal and sorption properties of the adsorbents prepared was tested. The materials were characterized by elemental analysis, low-temperature nitrogen sorption, thermogravimetric study and determination of the surface oxygen groups content. Sorptive properties of the materials obtained were characterized by the adsorption of methylene and alkali blue 6B as well as copper(II) ions. The final products were nitrogen- and oxygen-enriched mesoporous adsorbents of medium-developed surface area, showing highly diverse N and O-heteroatom contents and acidic-basic character of the surface. The results obtained in our study have proved that through a suitable choice of the modification procedure of commercial adsorbents it is possible to produce materials with high sorption capacity towards organic dyes as well as copper(II) ions.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 4; 120-127
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efekty utleniania tytanu po różnych metodach modyfikacji powierzchni
Titanium oxidation effects after various surface modification methods
Autorzy:
Jasiński, J.
Lubas, M.
Wieczorek, P.
Powiązania:
https://bibliotekanauki.pl/articles/286026.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
obróbka powierzchniowa (szlifowanie i polerowanie)
utlenianie tytanu
złoże fluidalne
chropowatość powierzchni
surface treatment (grinding and sandblasting)
titanium oxidation
fluidized bed
surface roughness
Opis:
W pracy przedstawiono analizę topografii powierzchni tytanu Grade 2 po obróbce mechanicznej (szlifowanie i piaskowanie) oraz wpływ aktywacji powierzchni na właściwości warstwy po procesie utleniania w złożu w temperaturze 610°C i czasie 6, 8 i 12 godzin. Do badań topografii powierzchni oraz analizy adhezji zastosowano metodę AFM i scratch test, natomiast strukturę i zmiany składu fazowego badano z zastosowaniem metody SEM-EDS i XRD. Badania topografii powierzchni tytanu Grade 2 przed procesem utleniania potwierdziły, że przeprowadzona aktywacja powierzchni z wykorzystaniem medium piaskującego w postaci Al2O3 korzystnie wpływa na zwiększenie chropowatości oraz poprawę stanu powierzchni tytanu po procesie utleniania szczególnie w czasie 8 godzin. Stwierdzono również, że zastosowanie złoża fluidalnego do procesów utleniania tytanu pozwala na otrzymanie jednorodnych powłok tlenkowych o dobrej adhezji z podłożem, a tym samym poprawę właściwości powierzchni tytanu w aspekcie zastosowań biomedycznych.
The paper presents an analysis of titanium grade 2 surface topography after surface treatment (grinding and sandblasting) and the influence of surface activating on the properties of the surface layer after the oxidation process in a Al2O3 fluidized bed, at 610°C and for 6, 8 and 12 hours. AFM and scratch test methods were used for surface topography and layer adhesion analysis, while SEM-EDX and XRD methods were used to examine the microstructure and changes in phase composition. Studies of Grade 2 titanium surface topography before oxidation confirmed that the surface activation carried out using the Al2O3 blasting medium increases the roughness and improves the state of titanium surface after oxidation, especially after 8 h. The results also showed that using of a fluidized bed for titanium oxidation allows to obtain uniform oxide layers for biomedical applications.
Źródło:
Engineering of Biomaterials; 2013, 16, 120; 41-47
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological Properties of Ti-6Al-7Nb Alloy after Isothermal Oxidation
Właściwości tribologiczne stopu Ti-6Al-7Nb po utlenianiu izotermicznym
Autorzy:
Aniołek, Krzysztof
Barylski, Adrian
Osior, Denis
Powiązania:
https://bibliotekanauki.pl/articles/188564.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermal oxidation
surface morphology
oxide layers
tribological properties
utlenianie izotermiczne
morfologia powierzchni
warstwy tlenkowe
właściwości tribologiczne
Opis:
The paper presents the characterization of tribological properties of the Ti-6Al-7Nb alloy before and after isothermal oxidation in different friction couples. Microscopic observations have shown that uniform oxide layers were obtained, which evenly covered the entire surface of the investigated samples. It was found that oxide layers deposited on the Ti-6Al-7Nb alloy substrate contribute to a considerable improvement of the tribological properties. The best resistance to sliding wear was shown by the layer obtained at a temperature of 600°C. It was also shown that presence of oxide layers on the surface of the Ti-6Al-7Nb alloy leads to an increase in the friction coefficient. The highest increase in the value of the friction coefficient was observed for a surface oxidized at 650°C during interaction with an Al2O3 ball. SEM observations of traces of the tribological interaction showed the presence of numerous scratches and fine wear products on the friction surface. For the non-oxidized condition, after interaction with a ball made of bearing steel 100Cr6, the presence was found of alternating, morphologically varied areas which had formed as a result of corrugation wear. Tests have shown that isothermal oxidation eliminates this disadvantageous phenomenon.
W pracy przedstawiono charakterystykę właściwości tribologicznych stopu Ti-6Al-7Nb przed oraz po utlenianiu izotermicznym w różnych skojarzeniach ciernych. Obserwacje mikroskopowe wykazały, że otrzymano jednolite warstwy tlenkowe, które równomiernie pokrywały całą powierzchnię badanych próbek. Stwierdzono, że warstwy tlenkowe otrzymane na podłożu stopu Ti-6Al-7Nb prowadzą do znacznej poprawy właściwości tribologicznych. Najlepszą odpornością na zużycie ścierne cechowała się warstwa tlenkowa otrzymana w temperaturze 650°C. Wykazano ponadto, że obecność warstw tlenkowych na powierzchni stopu Ti-6Al-7Nb prowadzi do wzrostu współczynnika tarcia. Największy wzrost współczynnika tarcia zaobserwowano dla powierzchni utlenionej w temperaturze 650°C podczas współpracy z kulką Al2O3. Obserwacje SEM śladów współpracy tribologicznej wykazały na powierzchni tarcia obecność licznych rys oraz drobne produkty zużycia. Dla stanu nieutlenionego po współpracy z kulką ze stali łożyskowej 100Cr6 stwierdzono obecność naprzemianległych różnych morfologicznie obszarów powstałych w wyniku zużycia falistego. Wykazano, że utlenianie izotermiczne eliminuje to niekorzystne zjawisko.
Źródło:
Tribologia; 2019, 285, 3; 5-12
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uszlachetnianie powierzchni stopu tytanu Ti6Al4V ELI
Surface refinement of titanium alloy Ti6Al4V ELI
Autorzy:
Klimas, J.
Dudek, A.
Klimas, M.
Powiązania:
https://bibliotekanauki.pl/articles/286231.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
biomateriały
utlenianie
stop tytanu
uszlachetnianie powierzchni stopu tytanu
biomaterials
oxidation
titanium alloy
surface refinement in titanium alloys
Opis:
W ramach pracy próbki ze stopu tytanu Ti6Al4V ELI poddano procesom utleniania chemicznego, termicznego i elektrochemicznego (anodowego). W celu określenia wpływu różnego rodzaju utleniania na występujące fazy, dokonano badania składu fazowego metodą dyfrakcji rentgenowskiej przed i po procesach utleniania. Ponadto przeprowadzono obserwację mikrostruktur oraz wykonano badania geometrii powierzchni - chropowatości. W wyniku zastosowania utleniania stopu tytanu wytworzono zmodyfikowaną warstwę tlenków o szczególnych, z punktu widzenia zastosowania w medycynie własnościach użytkowych. Z przeprowadzonych badań wynika, że wariant zastosowanego utleniania (chemiczne, termiczne i elektrochemiczne) wpływa na rodzaj uzyskanych faz na powierzchni stopu tytanu. Dodatkowo przeprowadzone badania geometrii powierzchni - chropowatości wykazały, że rodzaj zastosowanego utleniania wpływa na stopień rozwinięcia powierzchni, co ma znaczenie przy stosowaniu tego rodzaju materiałów w implantologii.
This study presents the results obtained after the processes of chemical, thermal and electrochemical (anode) oxidation of titanium alloy Ti6Al4V ELI. In order to determine the effect of different types of oxidation on individual phases, the authors examined phase composition by means of the method of X-ray diffraction before and after the oxidation processes. Furthermore, the microstructure examinations and surface geometry (roughness) testing were also carried out. Oxidation of titanium alloys caused formation of a modified layer of oxides with specific functional properties that make these materials useful for medical applications. The study showed that the variant of oxidation (chemical, thermal or electrochemical) impacts on the type of phases obtained on titanium surface. The examinations of surface geometry (roughness) demonstrated that the type of oxidation used impacts on the degree of surface development, which is important when using these materials in implantology.
Źródło:
Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 52-54
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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