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Wyszukujesz frazę "b-Ti" wg kryterium: Temat


Wyświetlanie 1-8 z 8
Tytuł:
Thermodynamic Description of Ternary Fe-B-X Systems. Part 6: Fe-B-Ti
Autorzy:
Miettinen, J.
Visuri, V.-V.
Fabritius, T.
Milcheva, N.
Vassilev, G.
Powiązania:
https://bibliotekanauki.pl/articles/356115.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
phase diagrams
thermodynamic modeling
Fe-based systems
Fe-B-X systems thermodynamic database
Fe-B-Ti system
Opis:
Thermodynamic optimizations of the ternary Fe-B-Ti system and its binary sub-system, B-Ti are presented. The thermodynamic descriptions of the other binaries, Fe-Ti and Fe-B, are taken from the earlier studies slightly modifying the Fe-Ti system assessment. The adjustable parameters of the Fe-B-Ti and B-Ti systems are optimized in this study using the experimental thermodynamic and the phase equilibrium data from the literature. The solution phases of the system are described using the substitutional solution model and the compounds (including borides) are treated as stoichiometric phases. The results show a good correlation between the calculated and measured thermodynamic and phase equilibrium data.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1249-1255
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the surface geometry of the orthodontic archwire and their influence on the bacterial adhesion
Autorzy:
Ziębowicz, B.
Woźniak, A.
Ziębowicz, A.
Ziembińska-Buczyńska, A.
Powiązania:
https://bibliotekanauki.pl/articles/366963.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
archwires
b-Ti
AFM
atomic force microscope
SEM/EDS
confocal microscopy
pitting corrosion
łuk ortodontyczny
mikroskop sił atomowych
mikroskopia konfokalna
korozja wżerowa
Opis:
Purpose: The aim of this work is to characterize the surface geometry of the orthodontic archiwire and their influence of the pitting corrosion resistance and bacterial adhesion. Design/methodology/approach: In the paper, the results of the SEM/EDS analysis and microscopic observation of the samples surface and analysis of geometrical structure with the use Atomic Force Microscope (AFM) and Confocal Microscopy were presented as well as the pitting corrosion test and surface roughness and microhardness measurements were performed. Additionally the microbiological study after bacterial breeding with the use Scanning Electron Microscope was carried out. Findings: In the basis of the investigation, it can be concluded that the surface geometry of archwire has a significant impact on their pitting corrosion resistance in artificial saliva solution and on the bacterial adhesion. The obtained results show satisfactory properties and surface geometry of the tested orthodontic wires for use in the human oral environment. Research limitations/implications: In the future, it is planned to extend the research with physicochemical properties and the influence of oral hygiene products on the corrosive behaviour of the material. Limitations in the conducted tests refer to archwire design – a small diameter making measurements difficult. Practical implications: The oral environment is an extremely aggressive corrosive environment. The orthodontic elements should have very good corrosion resistance and biocompatibility. The focus should be on continuously improving orthodontic wires in terms of material quality and topography of its surface topography. Originality/value: The research is conducted in the field of biomedical engineering, which is part of material engineering and is used for the field of dentistry and microbiology.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 93, 1-2; 32-40
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Holding Conditions on Microstructure of Al-5Ti-1B and Its Refining Efficiency on Al-Cu Alloy
Autorzy:
Huang, Y.
Shao, H.
Xiao, Z.
Ren, X.
Powiązania:
https://bibliotekanauki.pl/articles/353764.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-5Ti-1B
holding condition
microstructure
refining efficiency
Opis:
A series of Al-5Ti-1B master alloys were obtained via fluoride salt process by holding them between 780°C and 880°C for 10-90 min. The influence of holding temperature and time during preparation on the microstructure and its refining performance were investigated by X-ray diffractometer, optical microscopy and scanning electron microscopy equipped with energy dispersive X-ray spectroscopy. The results indicated both the morphology and the distribution of TiB22and Al3Ti were seriously affected by holding conditions. Inadequate TiB2 particles were generated when holding time was short. However, Fe-containing impurity particles that aggregated along the matrix grain boundaries were found after the prolonged holding time. The refining and microhardness test results revealed that Al-5Ti-1B, the one held at 820°C for 30 min showed the optimum refining efficiency on Al-Cu alloy.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 647-652
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Heating Parameters on Flow Stress Curves of Low-Alloy Mn-Ti-B Steel
Autorzy:
Kawulok, P.
Schindler, I.
Kawulok, R.
Opěla, P.
Sedláček, R.
Powiązania:
https://bibliotekanauki.pl/articles/354445.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
initial austenition grain size
peak stress
peak strain
Mn-Ti-B steel
Opis:
Influence of the initial grain size on hot deformation behavior of the low-alloy Mn-Ti-B steel was investigated. The uniaxial compression tests were performed in range of the deformation temperatures of 900-1200°C and strain rates of 0.1-10 s-1. One set of samples was heated directly to the deformation temperature, which corresponded to the initial austenitic grain size of 19-56 μm; the other set of samples was uniformly preheated at the temperature of 1200°C. Whereas the values of activation energy, peak stress and steady-state stress values practically did not depend on the initial austenitic grain size, the peak strain values of coarser-grained structure significantly increase mainly at high values of the Zener-Hollomon parameter. This confirms the negative effect of the large size of the initial grain on the dynamic recrystallization kinetics, which can be explained by the reduction in nucleation density.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1785-1792
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Al-Ti-B Grain-Refiners from Different Manufacturers on Wrought Al-Alloy
Autorzy:
Vončina, M.
Medved, J.
Jerina, L.
Paulin, I.
Cvahte, P.
Steinacher, M.
Powiązania:
https://bibliotekanauki.pl/articles/352194.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Ti-B grain-refiners
aluminium alloy AA6182
TiB2 particles
Al3Ti particles
inoculation potential
Opis:
To investigate the impact of various Al-Ti-B grain-refiners on solidification and grain-refining performance, a wrought aluminium alloy AA6182 was used. Three different grain-refiners from different manufacturers were used to establish the efficiency, i.e. contact time before casting, on the primary solidification and grain formation size. The primary solidification of α-Al grains at inoculation was observed by using thermal analysis (TA). Differential scanning calorimetry (DSC) was used in order to analyze the quality of various grain-refiners. The size of the primary grains was analyzed using optical microscopy (OM). Scanning electron microscopy (SEM) was used to estimate the size and distribution of Al3Ti and TiB2 particles in various grain-refiners and to establish the best efficiency of the investigated grain-refiners. Within 1-4 min of inoculation the smallest fine equiaxed grains were achieved when either one of the investigated grain-refiners was added. It was established, that grain-refiner A contains higher content of impurities which do not melt in the experimental temperature range made by DSC method. The most pure grain-refiner turned out to be grain-refiner B, in which the most optimal number of TiB2 particles and particle size distribution was found.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 739-746
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Ti Addition on the Residual Aluminium Content and Mechanical Properties of the B4C-Al Composites Produced by Vacuum Infiltration
Wpływ dodatku tytanu na resztkową zawartość aluminium i właściwości mechaniczne kompozytów B4C-Al wytworzonych przez infiltrację próżniową
Autorzy:
Xiaozhou, C
Chao, W.
Xiangxin, X.
Gongjin, C.
Powiązania:
https://bibliotekanauki.pl/articles/353693.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ti
B4C
residual aluminium
Interface reaction
resztkowa zawartość aluminium
infiltracja
Opis:
The effect of Ti addition on the residual Al content and mechanical properties of B4C-Al composites fabricated by vacuum infiltration was investigated in the present study. The B4C-Al composite materials were fabricated using [Ti+B4C] preforms preheated at 1700ºC for 1 h and Al alloys infiltrated in vacuum atmosphere at 1100ºC for 2 h. The phase composition indicated that TiB2 has high wettability to Al as a result of the preheating. SEM and EDX results revealed a number of Al dimples are on the fracture surface due to the existence of TiB2. When the content of added Ti increases to 30%, the [Ti+B4C] preform is characterized by a minimal porosity (33.11%) and a maximal density, a corresponding amount of residual Al of 33.11% and a minimal fracture toughness (5.03 MPa·m1/2) with a hardness of up to 63 HRC. The residual Al and the mechanical properties of the composite material preform were determined by the Ti content of the preform.
Zbadano wpływ dodatku tytanu na resztkową zawartość Al i właściwości mechaniczne kompozytów B4C-Al wytworzonych przez infiltrację próżniową. Kompozyty B4C-Al lzostały wytworzone przez infiltrację stopów Al, w próżni, w 1100ºC przez 2 godziny, do wstępnie wygrzanych w 1700ºC przez 1 godzinę preform [Ti+B4C]. Faza TiB2 charakteryzuje się wysoką zwilżalnością przez Al na skutek wstępnego wygrzania. Wyniki analizy SEM i EDX ujawniły pewną liczbę wgłębień Al znajdujących się na powierzchni pęknięcia z uwagi na obecność TiB2. Gdy zawartość dodanego Ti wzrasta do 30%, preforma [Ti+B4C] charakteryzuje się minimalną porowatością (33,11%) i maksymalną gęstością, odpowiednią ilością resztkowego Al tj. 33.11%, minimalną odpornością na kruche pękanie (5,03 MPa·m1/2), i twardością do 63 HRC. Resztkowe Al i właściwości mechaniczne materiału kompozytowego preformy determinowane są przez zawartość Ti w preformie.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 4; 2493-2498
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czynniki dobrej odpowiedzi na leczenie przeciwwirusowe zakażenia HBV
Factors that predict response to hepatitis B treatment
Autorzy:
Janocha-Litwin, Justyna
Simon, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/552866.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
hepatitis B
predictors of response
treatment
interferon alpha
nucleo-ti(-si)de analogues
Opis:
Duża liczba osób zakażonych wirusem zapalenia wątroby typu B na świecie i w Polsce oraz ograniczona dostępność i skuteczność leczenia przyczynowego wymusza poznanie czynników odpowiedzi na stosowaną terapię. Ma to na celu wybranie jak najlepszego leku oraz możliwość modyfikacji leczenia w trakcie terapii. W pracy omówiono poznane czynniki/znaczniki odpowiedzi na leczenie zakażenia HBV. Czynnikami dobrej odpowiedzi na terapię PEG-IFN wyjściowo są: niska wiremia HBV DNA , obecność HBeAg, wysoka aktywność Al at, genotyp A lub B HBV oraz wysoka aktywność zapalna w badaniu histopatologicznym bioptatu wątroby. Monitorowanie skuteczności leczenia przeciwwirusowego oceną wiremii HBV DNA metodą PCR , ilościowego oznaczania HBsAg, HBeAg i kinetyki spadku tych stężeń umożliwia modyfikację leczenia w trakcie jego trwania. Dalej istnieje potrzeba selekcjonowania nowych czynników pozwalających przewidywać skuteczność prowadzonego leczenia przeciwwirusowego u zakażonych HBV w celu ograniczenia ryzyka rozwoju odległych powikłań, tj. rozwoju marskości wątroby ze wszystkimi następstwami, oraz raka wątrobowokomórkowego
A large number of people infected with hepatitis B virus in Poland and the world as well as limited availability and efficiency of causal therapy necessitate further research on predictors of response to the therapy. It has to provide choosing the best medication and capability to modify the therapy. The paper discusses predictors of responses to the HBV therapy. Factors associated with response to PEG-IFN therapy are: low HBV DNA level, HBeAg presence, high Al at activity and active inflammation in histopathological examination of the liver biopsy. Modification of the therapy is possible by monitoring its effectiveness by using the assessment of HBV DNA levels with PCR method, HBsAg quantification and kinetics of the decrease in their concentrations. There is still a need to discover new factors that will let predict the efficiency of the antiviral therapy in HBV positive patients to decrease the risk of developing the long-term complications such as liver cirrhosis and hepatocellular cancer
Źródło:
Family Medicine & Primary Care Review; 2014, 1; 44-47
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of B4C Reinforcement on the Dry Sliding Wear Behaviour of Ti-6Al-4V/B4C Sintered Composites Using Response Surface Methodology
Autorzy:
Ramkumar, T.
Narayanasamy, P.
Selvakumar, M.
Balasundar, P.
Powiązania:
https://bibliotekanauki.pl/articles/351599.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ti-6Al-4V
B4C
powder metallurgy
dry sliding wear
response surface methodology
Opis:
The present investigation has been made to assess the influence of B4C reinforced with Ti-6Al-4V matrix prepared by powder metallurgy route. High energy ball milling was used to prepare the composites. Cylindrical preforms were prepared using suitable die set assembly. The green preforms were sintered in the muffle furnace at 900°C for 1h. Further the preforms were cooled inside the furnace till the room temperature has attained. SEM with EDS mapping analysis was used to evaluate the morphology and elemental confirmation of the prepared composite. The density and hardness of the samples are determined using Archimedes principle and Rockwell hardness testing machine. The wear resistance of the samples was determined by employing a pin on disc apparatus. The hardness of the composites (Ti-6Al-4V /10B4C) was increased while comparing to the base material (Ti-6Al-4V) which is attributed to the presence of hard ceramic phase. Response Surface Methodology (RSM) five level central composite design approach was accustomed and it minimised the amount of experimental conditions and developed mathematical models among the key process parameters namely wt. % of B4C, applied load and sliding distances to forecast the abrasive response of Specific Wear Rate (SWR) and Coefficient of Friction (CoF). Analysis of variance was used to check the validity of the developed model. The optimum parameters of specific wear rate and coefficient of friction were identified.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1179-1200
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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