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Wyświetlanie 1-15 z 187
Tytuł:
Synthesis and characteristics of titanium silicalite TS-1, Ti-Beta and Ti-MWW catalysts
Autorzy:
Wróblewska, A.
Fajdek, A.
Milchert, E.
Powiązania:
https://bibliotekanauki.pl/articles/779396.pdf
Data publikacji:
2009
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
TS-1
Ti-Beta
Ti-MWW
titanium-silicalite catalysts
Opis:
The synthesis methods of the following titanium-silicalite catalysts: TS-1, Ti-Beta and Ti-MWW were presented. The results of the analyses of the catalysts by XRD, SEM and IR, UV-vis methods were also shown. A brief description of the catalytic performances of these catalysts in the oxidation process of olefins, alkenes, alcohols and aromatic compounds was presented.
Źródło:
Polish Journal of Chemical Technology; 2009, 11, 1; 64-71
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on the deactivation of Ti-MCM-41 catalyst in the process of allyl alcohol epoxidation
Autorzy:
Wróblewska, A.
Makuch, E.
Powiązania:
https://bibliotekanauki.pl/articles/778158.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
titanium silicate Ti-MCM-41 catalyst
deactivation of Ti-MCM-41catalyst
regeneration of Ti-MCM-41catalyst
Opis:
The synthesis of Ti-MCM-41 catalyst was performed. The obtained catalyst was characterized by the following instrumental methods: UV-vis, IR spectroscopy, XRD, and X-ray microanalysis. The activity of the obtained catalyst was tested in the process of allyl alcohol epoxidation with 30 wt.% hydrogen peroxide in methanol as a solvent and under atmospheric pressure. In the next stage, recovery of Ti-MCM-41 catalyst from the post-reaction mixture and its regeneration by washing with appropriate solvents and drying were conducted. In the case of total loss of the activity of the catalyst, calcination of the catalyst was also carried out. The loss of titanium from the structure of Ti-MCM-41 catalyst and a partial collapsing of the structure of this catalyst can be the main reason of the decrease the activity of the catalyst what was manly visible in the decrease of the values of two functions of this process: the allyl alcohol conversion and conversion of hydrogen peroxide to organic compounds.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 4; 111-115
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Hafnium and Zirconium to Glass Forming Ability, Thermal Stability, Plasticity Deformation and Crystallization of Ni-Free Pentabasic Ti-Based Bulk Metallic Glasses
Autorzy:
Oak, J.-J.
Kim, Y. H.
Bae, K.-C.
Park, Y. H.
Powiązania:
https://bibliotekanauki.pl/articles/352087.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ti-based alloy
metallic glass
Ti fiber
glass formability
plastic deformation
Opis:
The newly designed Ti-based bulk metallic glass (BMG) in which case of fracture behavior was observed 1990MPa to compressive strength with a wide plastic deformation around 7% after process of elastic deformation. This phenomenon can be compared with those of Ti-based alloys and other Ti-based BMGs and indicates high potential to be applied in use. It was evaluated the Ti-based BMG for thermal stability that the reduced glass parameters, ΔTx, Trg and γ, are 79K, 0.50 and 0.38, respectively. In addition, it reveals high activation energies for crystallization in which are estimated to Ex1 = 291.77 ±9.71 kJ/mol, Ex2 = 588.77 ±28.88 kJ/mol and Ex3 = 330.26 ±3.61 kJ/mol on kissinger plotting in this study.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1081-1087
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of Fe-Ni-Ti-Cr system
Autorzy:
Hoppe, Viktoria
Gibas, Anna
Grzegorczyk, Weronika
Małecki, Marcin
Hasiak, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/1188070.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
właściwości mechaniczne
stopy z pamięcią kształtu
stop Fe-Ni-Ti
stop Fe-Ni-Ti-Cr
mechanical properties
shape memory alloys
Fe-Ni-Ti alloy
Fe-Ni-Ti-Cr alloy
Opis:
The research comprises a discussion about a formation of intermetallic phase with stoichiometric composition Fe2Ti, called Laves phase, and influence of chromium on the whole structure containing this phase by means of comparison of the two alloys. A base Fe35Ni35Ti30 alloy was used as a reference and then compared with a Fe-Ni-Ti chromium doped - Fe30Ni35Ti30Cr5 alloy. The study of microstructure performed with scanning electron microscope enabled to distinguish different phases. These regions are rich in mixture of Fe-Ni and Ti-Ni elements. The identified phases are Fe2Ti and Ni3Ti which was confirmed by X-ray diffraction and simultaneously it is consistent with energy dispersive spectroscopy results. Differential scanning calorimetry confirmed also multi-phase composition. As a result different hardness was measured for these phases using nanoindentation. The overall hardness was established using the Vickers method.
Źródło:
Interdisciplinary Journal of Engineering Sciences; 2019, 7, 1; 1--14
2300-5874
Pojawia się w:
Interdisciplinary Journal of Engineering Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasma oxidized Ti6Al4V and Ti6Al7Nb alloys for biomedical applications
Autorzy:
Pązik, B.
Grabarczyk, J.
Batory, D.
Kaczorowski, W.
Burnat, B.
Czerniak-Reczulska, M.
Makówka, M.
Niedzielski, P.
Powiązania:
https://bibliotekanauki.pl/articles/285698.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
Ti6Al4V alloy
Ti-6Al-7Nb alloy
biomaterials
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 68
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Kinetic of Al3Ti Phase Growth in Explosively Welded Multilayered Al/Ti Clads during Annealing under Load Conditions
Autorzy:
Petrzak, P.
Mania, I.
Paul, H.
Maj, Ł.
Gałka, A.
Powiązania:
https://bibliotekanauki.pl/articles/356880.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
explosive welding
annealing under compression
Al/Ti multilayered composites
Al3Ti phase
Opis:
Multilayered composites based on light metals are promising materials in many applications. In the present work the 15-layered clad, composed of alternately stacked of Ti(Gr.1) and AA1050-H24 alloy sheets of 1 mm thick has been investigated with respect to determination of the kinetic of the Al3Ti phase growth. The defect-free multilayered composite was successfully formed by explosive welding technology. Then EXW samples were modified via annealing at the temperature of 600°C in closed die under pressure of 44 MPa for various times ranged between 1 and 10 h. Transmission and Scanning Electron Microscopy examinations were conducted in order to study the kinetic of the elements migration across the interfaces between the layers of the Al/Ti composite. The macro-scale observations of samples after EXW revealed that wavy interfaces were always formed in layers near the explosive charge. The increase of the distance from the top surface leads to flattening of the interface with very thin reaction layer between Al and Ti sheets. During annealing the kinetic of the Al3Ti phase growth is similar near all interfaces and coincides with data from other works. It was found that despite the loading after 10 h of annealing still only small part of Al-sheets undergoes dissolution and the width of the reaction layer does not exceed 5-8 μm.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1549-1554
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cloninger’s Psychobiological Model of Personality and Strelau’s Regulative Theory of Temperament – analysis of their associations in a Polish sample
Autorzy:
Hornowska, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/430812.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
personality
temperament
TCI
FCB-TI
Opis:
The present study explores the relationship between Cloninger scales and Strelau's Regulative Theory of Temperament (RTT ) traits. Cloninger's psychobiological model identifies four dimensions of temperament (Novelty seeking, Harm Avoidance, Reward Dependence and Persistence) and three dimensions of character (Self-Directedness, Cooperativeness and Self-Transcendence). RTT proposes the traits of Briskness, Perseveration, Sensory Sensitivity, Emotional Reactivity, Endurance and Activity as the basic dimensions underlying individual differences. The relationships between the dimensions of Cloninger's Temperament and Character and Strelau's Regulative Theory of Temperament are investigated in a sample of 282 participants. Data analysis demonstrated some significant correlations between the two models. The strongest associations were found between the dimension of Harm Avoidance from Cloninger’s concept and Strelau’s RTT traits (positive correlations from r = .73 for Emotional Reactivity to r = .48 for Perseveration, and negative correlations from r = -.57 for Endurance to r = -.51 for Briskness). However, there is not enough evidence to suggest that the two models offer an alternative way of explaining individual differences. According to RTT, temperamental traits are expressed in formal characteristics of behavior (energetic and temporal) and every kind of behavior (irrespective of its content) can be described in the same formal categories. In the Psychobiological Model of Personality the traits are characterized rather by the content or goals of behavior. In this model, in addition to underlining the biological variation of heritable traits, the social, cultural and phenotypical levels of behavior are reflected.
Źródło:
Polish Psychological Bulletin; 2011, 42, 2; 71-80
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined Effect of Zr and Si on Isothermal Oxidation of Ti
Autorzy:
Ha, S.-H.
Kim, B.-H.
Yoon, Y.-O.
Lim, H.-K.
Kim, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/353260.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ti
Zr
Si
silicide
oxidation
Opis:
In this study, the combined effect of Zr and Si on isothermal oxidation of Ti for 25 and 50h at 820°C, which is the temperature related to exhaust valves operation, was investigated. Si addition into Ti-5mass%Zr alloy led to a distribution of silicide Ti5Si3 phase formed by a eutectic reaction. The Ti sample containing only Zr showed more retarded oxidation rate than Ti-6Al-4V, the most prevalent Ti alloy, at the same condition. However, while a simultaneous addition of Zr and Si resulted in greater increase of oxidation resistance. The oxide layer formed after the addition of Zr and Si comprised TiO2, ZrO2, and SiO2.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1493-1495
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure Evolution of Ti/ZrO2 and Ti/Al2O3 Composites Prepared by Powder Metallurgy Method
Autorzy:
Dercz, G.
Matuła, I.
Gurdziel, W.
Kuczera, N.
Powiązania:
https://bibliotekanauki.pl/articles/353964.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite
Ti-ZrO2
Ti-Al2O3
high energy ball milling
Rietveld analysis
Opis:
The current study were performed in order to assess the fabrication possibility of the metal-ceramic composites based on nanocrystalline substrates. The influence of the variable time of the high energy ball-milling (10, 30 and 50 h) on the structure, pores morphology and microhardness of Ti/ZrO2 and Ti/Al2O3 compositions was studied. The X-ray diffraction analysis confirmed the composite formation for all milling times and sintering in the case of Ti/ZrO2 system. Decomposition of substrates during milling process of Ti/Al2O3 system was also observed. Additionally, the changes of lattice parameter as a function of milling time were studied. The morphology of powders and the microstructure of the sintered samples were observed by scanning electron microscopy (SEM). Also, analysis of microhardness and pores structure were performed.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 443-450
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the Characterization of Ti Inclusions and Their Precipitation Behavior in Tire Cord Steel
Autorzy:
Lei, Jialiu
Zhao, Dongnan
Fu, Yongjun
Xu, Xianfeng
Powiązania:
https://bibliotekanauki.pl/articles/383339.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
precipitation behavior
Ti inclusions
concentration product
tire cord steel
characterization
linka stalowa
wtrącenia Ti
odpady
Opis:
In the present investigation, the morphology of Ti inclusions in high strength tire cord steel was investigated and their precipitation behavior was discussed using a precipitation and growth model. The results show that Ti inclusions mainly exist in the form of TiN. The two-dimensional characterization of Ti inclusions is square-like with sharp edges and corners, while its three-dimensional shape exhibits a cubic or rectangular-prism morphology. The Ti inclusions do not precipitate when the solid fraction of tire cord during solidification is less than 0.987, and their final radius is closely related to the cooling rate and initial concentration product. The higher the cooling speed, the smaller the final radius, when the cooling speed is constant, the final radius of Ti inclusions is mainly determined by the initial concentration product, w[N]0×w[Ti]0. In order to retard the precipitation and growth of Ti inclusions in tire cord steel, the cooling rate and initial concentration product can be taken into consideration.
Źródło:
Archives of Foundry Engineering; 2019, 3; 33-37
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
D.C. Conductivity of Polymer Composites with (BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ Superconductor
Autorzy:
Ulański, J.
Jeszka, J. K.
Polanowski, P.
Głowacki, I.
Kryszewski, M.
Staerk, D.
Helberg, H.
Powiązania:
https://bibliotekanauki.pl/articles/1933406.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Ph
81.20.Ti
Opis:
Electrical properties of conducting reticulate doped polymeric films containing BEDT-TTF iodide crystalline network were investigated. Conditions of preparation of this kind of films i.e. time of doping by iodine vapours and time and temperature of annealing and their influence on transformation of the BEDT-TTF iodide crystallites into superconducting phase are discussed.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 899-903
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The microstructural properties of explosion welded Ni/Ti joint
Autorzy:
Zdrodowska, K.
Wojsyk, K.
Szala, M.
Powiązania:
https://bibliotekanauki.pl/articles/103160.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
explosion welding
joint
Ni/Ti microstructure
Opis:
Explosion welding is one of the ways of bonding materials. This method is used to bond metals which either cannot be joined or they are difficult to bond by other methods. The study investigates the metallographic characteristics of Ni/Ti joints in the form of a plate. Microstructures of the joints are examined and hardness measurements are carried out on the bonded materials and their interfaces. A detailed analysis of the distributions of wave length and width is presented. An average microhardness of the interface is found to be higher than that of the base materials.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 22; 71-74
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reinforcement of Elastic Polymer Matrix Filled with Ultrafine Particles
Autorzy:
Kryszewski, M.
Bąk, G. W.
Powiązania:
https://bibliotekanauki.pl/articles/1968469.pdf
Data publikacji:
1997-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.Dc
81.20.Ti
Opis:
The nanofiller of noble metal may modify the properties of the polymer- noble metal composite even if the concentration of the metal nanoparticles is very low. The aim of this paper is to study the influence of colloidal particles in nanocomposites. For our studies we have selected polymethyl methacrylate-palladium nanocomposite. It is shown that the effective radius of the immobilised matrix environment is much greater than the radius of the palladium particles. Due to the binding of the matrix polymer and the palladium surface some volume of the surrounding matrix becomes immobilised giving rise to the effective increase in the size of the palladium filler. The analysis of a few models of nanocomposites used for interpretation of the mechanical properties has also been presented.
Źródło:
Acta Physica Polonica A; 1997, 92, 6; 1163-1167
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Impurity Reduction on Mechanical Properties of Fe29.5Ti70.5 Alloy Prepared by Pretreated Ti Scraps
Autorzy:
Yoo, Suhwan
Oh, Jung-Min
Yang, Jaeyeol
Yoon, Jaesik
Lim, Jae-Won
Powiązania:
https://bibliotekanauki.pl/articles/2049257.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ti scraps
pre-treatment
recycling
refining
Opis:
Ferrotitanium can be produced as a method of recycling Ti scraps. The eutectic composition of ferrotitanium, Fe29.5Ti70.5, can be obtained as a nanocrystalline phase due to relatively low melting point. Fe29.5Ti70.5 in which FeTi and β-Ti form a lamellar structure have high strength but low strain. To improve this, impurities were removed through hydrogen plasma arc melting (HPAM) and annealed. HPAM can remove substitutional/interstitial solid solutions. As a result, from 6733 ppm to 4573 ppm of initial impurities were removed by HPAM process. In addition, the strain was improved by spheroidizing and coarsening the lamellar structure through annealing. The effect of impurities removed through HPAM on the Young’s modulus, yield strength, and strain was observed.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 729-733
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Characteristics of Composites of (Mo, Ti)C Ti and TiC/Ti Type Manufactured with SLM technique
Autorzy:
Figiel, P.
Biedunkiewicz, A.
Biedunkiewicz, W.
Grzesiak, D.
Pawlyta, M.
Powiązania:
https://bibliotekanauki.pl/articles/354941.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanocomposites
TiMCs
SLM
(Ti, Mo)C
Opis:
The addition of hard ceramic particles of nc-(Ti, Mo)C in carbon network into Ti matrix has been proved to be an efficient way to enhance their properties. The purpose of this work was to analyze the corrosion, tribological, mechanical and morphological effects of combining nc-(Ti, Mo)C/C with titanium metal, to create a unique composite via selective laser melting technique (SLM). Composites with different weight percentage (5, 10 and 20 wt%) of ceramic phase were produced. The samples of pure Ti and Ti-6Al-4V alloy were also tested, as a reference. These composites were examined for corrosion resistance in body fluid (artificial saliva solution). Moreover, the properties of titanium composites reinforced with nc-TiC powders were compared. It was stated that mechanical properties were significantly improved with increasing amount of nc-(Ti, Mo)C/C in Ti matrix. In terms of corrosion resistance, the composites showed worse properties compared to pure titanium and Ti-6Al-4V alloy, but better than TiC-reinforced composites.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1617-1625
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 187

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