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1

Characterization of Al 6061/Al2O3/SiC composites with cerium oxide: corrosion analysis and microstructural insights

Sharma Vipin Kumar, Kumar Pardeep, Kumar Dinesh, Chalisgaonkar Rupesh, Akhai Shalom

Composites Theory and Practice

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2024

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R. 24, nr 1

49--56

EN

CeO2) is incorporated, employing electrochemical analysis and scanning electron microscopy (SEM) techniques. This study investigated the impact of cerium oxide on the corrosion behavior and assessed the hydrophobic properties of the composite surface in corrosive environments using contact angle measurements. The experimental methodology comprised several key components, like the selection of specific materials, the production of hybrid composites by the stir casting technique, the analysis of corrosion using the potentiodynamic polarization method, and the characterization of surface wettability. The metallographic analysis of the composites provided insights into the impact of various reinforcements on the microstructural properties. The incorporation of cerium oxide served to mitigate agglomeration and augment grain refinement within the composites. The utilization of potentiodynamic polarization analysis revealed enhanced corrosion resistance in hybrid composites containing cerium oxide in comparison to the Al 6061 alloy. The corrosion current density exhibited a decrease as the content of CeO2 increased. The findings indicate that cerium oxide can effectively prevent corrosion in aluminum hybrid, composites. These composites show potential for use in corrosion-prone applications.

2

Mechanical properties of Ni-Fe-Cu-P-B alloy produced by two component melt spinning (TCMS)

Wojciechowska M., Ziewiec K., Kąc S., Prusik K.

Archives of Metallurgy and Materials

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2017

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Vol. 62, iss. 1

137--140

EN

The aim of this work was to investigate the microstructure and mechanical properties of the two-component melt-spun (TCMS) alloy produced from Ni40Fe40B20 and Ni70Cu10P20 melts. The Ni40Fe40B20, Ni70Cu10P20, Ni55 Fe20 Cu5 P10 B10 alloys were arc-melted. Then the alloys were melt-spun in the two different ways i.e.: by casting from a single-chamber crucible and from the two-chamber crucible. All of the above mentioned alloys were processed in the first way and the Ni40Fe40B20 and Ni70Cu10P20 were simultaneously cast on the copper roller from the two-chamber crucible. The microstructure of the alloy was studied using transmission electron microscopy (TEM), scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS) and light microscopy. The mechanical properties were investigated using tensile testing and nanoindentation. The two-component melt-spun (TCMS) amorphous Ni55 Fe20 Cu5 P10 B10 alloy present hardness, tensile strength and Young modulus on the significantly higher level than for a single phase amorphous Ni55 Fe20 Cu5 P10 B10 alloy and slightly below the corresponding values for the Ni40Fe40B20.

3

Structural, electrical and magnetic features of Kagomé YBaCo4O7 system

Bhat M. A., Zargar R. A., Modi A., Arora M., Gaur N. K.

Materials Science Poland

|

2016

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Vol. 34, No. 4

786--793

EN

Polycrystalline yttrium barium cobaltite (YBaCo4O7) powdered sample was prepared by conventional solid state reaction route using high purity yttrium oxide, barium carbonate and cobalt oxide. The as-prepared sample was characterized by XRD diffraction, SEM/EDAX, Raman analytical techniques, resistivity and magnetization measurements for structural, morphological, electrical and magnetic properties assessment. XRD pattern confirms the single phase formation of the sample without any impurity. SEM image shows the hexagonal growth of the crystal and EDAX spectrum reveals stoichiometric composition of as prepared sample. The variation in electrical resistivity from 90 K to 300 K follows the variable range hopping conductivity mechanism. The strong broad overlapped Raman peaks of Co–O and Y–O stretching and bending vibrations of tetrahedral CoO4 with included components of YO6 of octahedral symmetry are obtained at 542 cm-1, 486 cm-1 and 636 cm-1, 436 cm-1, respectively. DC magnetic susceptibility exhibits very weak ferromagnetism below 80 K and does not obey Curie-Weiss law.

4

Microstructural evolution of HR6W alloy during ageing at high temperature

Cempura G., Rutkowski B., Rydel J., Cieszyński K., Czyrska-Filemonowicz A.

Inżynieria Materiałowa

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2016

|

Vol. 37, nr 5

211--216

EN

The HR6W alloy (23Cr40Ni30Fe7WTiNb) is a candidate for boiler components of advanced ultra-supercricical (A-USC) conventional power plants. The influence of isothermal ageing at 700°C and 900°C for up to 110 hours on the microstructure of HR6W alloy was investigated in detail by advanced scanning and transmission electron microscopy methods. The results show that, beside primary MX carbonitrides, the M23C6 and Laves phase, Fe2W, were precipitated in the austenitic matrix. Their size and spatial distribution depend on ageing conditions. Microstructure changes influenced the hardness of the investigated alloy.

PL

Stop HR6W został wyprodukowany przez firmę Nippon Steel & Sumimoto Metal Corporation. Nominalny skład chemiczny stopu HR6W to 23Cr40Ni30Fe7WTiNb. Ze względu na dużą odporność na utlenianie oraz wytrzymałość na pełzanie stop HR6W jest przeznaczony do zastosowań na elementy kotłów pracujących przy parametrach ultranadkrytycznych (A-USC advanced ultra-supercritical), np.: przegrzewacze pary pierwotnej, komory wylotowe itp. Celem pracy było określenie stabilności mikrostruktury oraz jej zmian podczas wysokotemperaturowego, izotermicznego starzenia w temperaturze 700°C i 900°C w aspekcie możliwości zastosowania stopu HR6W do długotrwałej pracy w warunkach wysokiej temperatury.

5

The origin and chronology of medieval silver coins based on the analysis of chemical composition

Pańczyk E., Sartowska B., Waliś L., Dudek J., Weker W., Widawski M.

Nukleonika

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2015

|

Vol. 60, No. 3, part 2

657--663

EN

Medieval Central Europe coins – the Saxon coins, also called as the Otto and Adelheid denarii, as well as the Polish ones, the Władysław Herman and Bolesław Śmiały coins – were examined to determine their provenance and dating. Their attribution and chronology often constitute a serious problem for historians and numismatists. For hundreds of years, coins were in uncontrolled conditions and in variable environment. Destructed and inhomogeneous surface were the effect of corrosion processes. Electron microscopy with energy dispersive X-ray analysis (scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS)), X-ray fluorescence (XRF) analysis (energy dispersive X-ray fluorescence (EDXRF) and total reflection X-ray fluorescence (TXRF)), and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) were applied. The results of these investigations are significant for our knowledge of the history of Central European coinage, especially of Polish coinage.

6

Diatomaceous rocks of the Jawornik deposit (the Polish Outer Carpathians): petrophysical and petrographical evaluation

Figarska-Warchoł B., Stańczak G., Rembiś M., Toboła T.

Geology, Geophysics and Environment

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2015

|

Vol. 41, no. 4

311--331

EN

Diatomites belonging to a list of raw materials used in the EU criticality assessment are essential to many industrial applications due to a unique combination of their physical properties, i.e. porous and permeable structure, high specific surface area and adsorption capacity, low density and thermal conductivity, and chemical inertness. The present study was undertaken to analyse the relationships between the pore network characteristics, petrophysical parameters, and mineralogical variability of the Lower Miocene diatomites from the Jawornik deposit (Skole Unit, the Polish Outer Carpathians, SE Poland). Five varieties of the diatomites, distinguished on the basis of the macroscopic features, i.e., colour and fracturing effects, have been investigated by SEM, chemical and XRD analysis, mercury intrusion porosimetry, helium pycnometry, and the Vickers hardness tests. Significantly differing are two varieties. The light-coloured, massive and block-forming diatomites (variety BL) consist mainly of poorly cemented siliceous skeletal remains of diatoms, and represent the rocks with high total porosity (38–43%), low bulk density (1.28–1.38 g/cm3) and low microhardness (10.7 HV0.3). The dark-gray silicified diatomites with a platy or prismatic splitting (variety PD) reveal obscured microfossils of diatoms and are the most compact and hard rocks (80.8 HV0.3), with poor total porosity (17–24%) and higher bulk density (1.70–1.78 g/cm3). The spatial distribution of the field identifiable rock varieties allows selective exploitation of the diatomites with the predictable petrophysical characteristics that define their future use.

7

Shield Effect Of Functional Interlining Fabric

Šaravanja B., Malarić K., Pušić T., Ujević D.

Autex Research Journal

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2015

|

Vol. 15, no. 2

93--98

EN

Electromagnetic interference (EMI) have become very serious in a variety of different electronic equipments, such as personal computers (frequency at several GHz), mobile devices (0.9 – 2.4 GHz) and similar. This imposes the need for setting boundaries for EM emission of electric and electronic devices in order to minimize the possibility of interference with radio and wireless communications. Functional textiles can offer protective properties against EM radiation. The aim of this study is to investigate the degree of protection against EM radiation provided by polyamide copper-coated interlining fabric before and after dry cleaning treatment. EM protection efficiency of the interlining functional fabric is explored on both sides at the frequencies of 0.9; 1.8; 2.1 and 2.4 GHz. The results obtained have shown that the interlining fabric has good protective properties against EM radiation, but after dry cleaning, treatment reduction is observed. Scanning electron microscopy micrographs of the interlining surface confirms shield effect decline due to degradation and firing of the copper layers during the process of dry cleaning.

8

Failure Strain and Strain-Stress Analysis in Titanium Nitride Coatings Deposited on Religa Heart Ext Ventricular Assist Device

Kopernik M.

Archives of Metallurgy and Materials

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2015

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Vol. 60, iss. 1

121--129

EN

The Polish ventricular assist device is made of Bionate II with deposited TiN biocompatible nano-coating. The two scale finite element model is composed of a macro-model of blood chamber and a micro-model of the TiN/Bionate II. The numerical analysis of stress and strain states confirmed the possibility of fracture. Therefore, the identification of a fracture parameter considered as a failure strain is the purpose of the present work. The tensile test in a micro chamber of the SEM was performed to calibrate the fracture parameter of the material system TiN/Bionate II. The failure strain is a function of a temperature, a thickness of coating and parameters of surface's profile. The failure strain was calculated at the stage of the test, in which the initiation of fracture occurred. The finite element micro-model includes the surface roughness and the failure strain under tension condition for two thicknesses of coatings which will be deposited on the medical device.

PL

Polska komora wspomagania pracy serca jest wykonana z Bionate II z naniesioną biokompatybilną powłoką TiN. Dwu-skalowy model elementów skończonych składa się z modelu makro czaszy krwistej i z modelu mikro dla TiN/Bionate II. Numeryczna analiza stanów naprężeń i odkształceń potwierdza prawdopodobieństwo pękania. Zatem, identyfikacja parametru pękania rozpatrywanego jako odkształcenie uszkodzenia jest celem niniejszej pracy. Próba rozciągania w komorze SEM została przeprowadzona, aby skalibrować parametr pękania dla układu materiałowego TiN/Bionate II. Odkształcenie uszkodzenia jest funkcją temperatury, grubości powłoki i parametrów profilu powierzchni. Odkształcenie uszkodzenia zostało obliczone w tym etapie testu, w którym pojawiła się inicjacja pęknięcia. Mikro model elementów skończonych zawiera chropowatość powierzchni i odkształcenie uszkodzenia w warunkach rozciągania dla dwóch grubości powłok, które będą nanoszone w tym urządzeniu medycznym.

9

Algorytm cyfrowej korekcji głębi ostrości w elektronowej mikroskopii skaningowej

Bużantowicz M., Bużantowicz W.

Mechanik

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2014

|

R. 87, nr 7CD

59—68

PL

Głębia ostrości w skaningowych mikroskopach elektronowych (SEM) ograniczona jest czynnikami fizycznymi. Opracowany algorytm eliminuje niepożądane efekty charakterystyczne dla serii zobrazowań SEM (przesunięcia, zmiany geometrii) oraz zwiększa głębię ostrości poprzez cyfrową korekcję i złożenie zbioru fotografii w jeden obraz o żądanych parametrach. Działanie aplikacji jest niezależne od typu mikroskopu, stąd może ona współpracować z urządzeniami pomiarowymi różnych producentów. Istnieje również możliwość wykorzystania przedstawianego algorytmu do korekcji zobrazowań pozyskiwanych z klasycznych mikroskopów optycznych.

EN

The depth of field (DoF) in scanning electron microscopes (SEM) is limited by physical factors. The developed algorithm eliminates adverse characteristics for a variety of SEM visualizations (drifts, changes in geometry) and increases the DoF by digital correction and assembling a set of photographs into a single image with desired parameters. The algorithm is independent from the type of device, so it can cooperate with microscopes delivered by different manufacturers. There is also a possibility of using the proposed solution to increase quality of visualizations obtained from conventional optical microscopes.

10

Atomic force microscopy investigation of electron beam (EB) irradiated composites based on biodegradable polymers and coconut fiber*

Kodama Y., Oishi A., Nagasawa N., Nakayama K., Tamada M., Machado L. D. B.

Nukleonika

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2013

|

Vol. 58, No. 4

459--468

EN

In this study, the addition of natural fibers to biodegradable PCL, PLLA blend and the effect of ionizing radiation on the surface of composites were investigated by force modulation microscopy (FMM), atomic force microscopy (AFM) and scanning electron microscopy (SEM). Hot pressed sheets were prepared using pellets of twin extruded PCL:PLLA 20:80 (w:w) blend containing 5% or 10% weight concentration of coconut fiber. In this study coconut fibers non treated chemically and acetylated ones were used. Irradiation was performed using an electron beam (EB) accelerator and an absorbed dose of 100 kGy. FMM images acquisition was obtained using a silicon cantilever, intermittent contact mode (tapping mode). Also, AFM images were obtained using tapping mode but J scanner. By FMM, it was possible to observe regions with different elasticity indicating fiber presence under the surface of the composite. Furthermore, it appears that the spherical structures size decreased on composites. This probably was induced by ionizing radiation.

11

Physicochemical and electrochemical properties of AISI 316L stainless steel used for implants in human urinary system

Walke W., Przondziono J.

Archives of Metallurgy and Materials

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2013

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Vol. 58, iss. 2

625--630

EN

The main purpose of this study was to evaluate physicochemical and electrochemical properties of AISI 316L stainless steel with modified surface, used for implants in human urinary system. In order to simulate conditions, which occur in the tissue environment of the urinary system, the test pieces were exposed in a urinary solution at temperature of T=37 ±1ºC, for a period of 30 days. Evaluation of physicochemical properties of biomaterial was made on the basis of surface chemical analysis (XPS). To evaluate the effects which occur on the surface of the examined steel, Electrochemical Impedance Spectroscopy (EIS) method was also employed. Analysis of test results shows favourable influence of the suggested surface treatment of AISI 316L stainless steel. Samples having electrolytically polished and chemically passivated surface featured the best physicochemical and electrochemical characteristics.

PL

Podstawowym kryterium przydatności biomateriału metalowego na implanty urologiczne (stenty urologiczne) jest biokompatybilność. Jest ona w głównej mierze związana z własnościami fizykochemicznymi powierzchni implantu, które powinny być dostosowane do cech środowiska tkanek układu moczowego człowieka. W celu poprawy biokompatybilności stali Cr-Ni-Mo ustalono warunki wytwarzania warstw pasywnych na jej powierzchni. Wytworzenie warstwy pasywnej obejmowało etap polerowania elektrolitycznego i pasywowania. Taki sposób obróbki powierzchniowej zapewnił chropowatość Ra < 0,16 μm wymaganą dla tego rodzaju implantów. W pracy tej szczególną uwagę skoncentrowano na analizie długotrwałego oddziaływania środowiska sztucznego moczu na własności fizykochemiczne wytypowanej stali. Zasadniczym celem pracy była ocena własnosci fizykochemicznych i elektrochemicznych stali AISI 316L o modyfikowanej powierzchni stosowanej na implanty w układzie moczowym człowieka. W celu zasymulowania warunków występujących w środowisku tkankowym układu moczowego próbki poddawano ekspozycji w roztworze sztucznego moczu o temperaturze T=37±1ºC przez okres 30 dni. O przydatności zaproponowanej warstwy pasywnej do uszlachetniania powierzchni stali w znacznym stopniu decyduje jej skład chemiczny. Dlatego w pracy wykonano badania składu chemicznego metodą spektroskopii fotoelektronów (XPS), z użyciem wielofunkcyjnego spektrometru elektronów PHI 5700/660 firmy Physical Electronics, podczas których zidentyfikowano i wyznaczono stężenia atomowe pierwiastków w badanych warstwach pasywnych. Dla próbek przeprowadzono pomiar widma fotoelektronów w szerokim zakresie energii wiązania od 0÷1400 eV oraz dokładne pomiary linii widmowych poszczególnych pierwiastków składowych z warstwy powierzchniowej. Dla oceny zjawisk zachodzacych na powierzchni badanej stali zastosowano również metodę elektrochemicznej spektroskopii impedancyjnej (EIS). Pomiary przeprowadzono z wykorzystaniem systemu pomiarowego AutoLab PGSTAT 302N wyposażonego w moduł FRA2 (Frequency Response Analyser). Badania przeprowadzono w alternatywnym roztworze symulującym środowisko moczu człowieka. Zastosowana w pracy mikroskopia skaningowa pozwoliła na ocene stanu powierzchni stali AISI 316L przed i po ekspozycji w sztucznym moczu. Analiza wyników badań wskazuje na korzystny wpływ zaproponowanej obróbki powierzchniowej stali AISI 316L. Najkorzystniejszą charakterystykę fizykochemiczną i elektrochemiczną miały próbki o powierzchni polerowanej elektrolitycznie i pasywowanej chemicznie. Przeprowadzone w pracy badania stanowią podstawę do dalszych analiz związanych z zagadnieniem biokompatybilności stali Cr-Ni-Mo stosowanej na implanty w urologii.

12

Degradation of GFRP Marine Laminates with Nano Particle Modified Coatings

Landowski M., Imielińska K.

Advances in Materials Science

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2013

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Vol. 13, nr 2(36)

19--22

EN

Water absorption and surface blistering behaviour was studied for polyester-matrix laminates with SiO2 nanoparticle reinforced gel coats. Accelerated water immersion tests at 37°C showed that addition of 10% nanoparticles increases blisters incubation time by ca. 50% compared to 5% and 0% nanoparticles composites.

13

Synthesis, chemical characterization and antifungal activity of thin layers prepared by sol-gel method

Nocun M., Zontek J., Kwasny S.

Optica Applicata

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2012

|

Vol. 42, nr 2

315-322

EN

Sol-gel method was used to prepare SiO2-TiO2 thin layers on the microscope slide glasses with additions of Cu, Ag, Au compounds. The films were calcimined at 150 °C for 1 hour. We studied the morphology of the following samples by scanning electron microscopy (SEM with EDS analysis), and the X-ray photoelectron spectroscopy (XPS). Antifungal properties of the layers were tested with the use of fungi Penicyllium. The results have shown that the best antifungal effect among the examined layers has got the sample with Au ions addition.

14

Nanopores with controlled profiles in track - etched membranes

Sartowska B. A.

Nukleonika

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2012

|

Vol. 57, No. 4

575-579

EN

Track-etched membranes are porous systems consisting of a polymer foil with thin channels-pores - from surface to surface. The increasing interest in this kind of material is connected with the development of nanoporous materials with unique properties such as diode-like effects in membranes with highly asymmetrical nanopores. The materials can be used for molecular sensors and atom beam optics, development of nanocapillary bodies for modelling the transport of molecules and ions in constrained volumes. Control over pore geometry opens the way to a number of new applications of track-etch membranes (TMs). The nanopores were obtained by the ion-track etching method using surfactant-doped alkaline solutions. Control over the pore profile and dimensions was achieved by varying the alkali concentration in the etchant and the etching time. The pore geometry was characterized in detail using field-emission scanning electron microscopy (SEM). SEM images of the surfaces and cleavages of TMs with different pore morphology are shown.

15

Possibility of decreasing the activation energy of resistivity of mullite by doping with nickel ion

Roy D., Das S., Nandy P.

Materials Science Poland

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2012

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Vol. 30, No. 4

406--413

EN

Monophasic mullite samples doped with 0.002 M, 0.02 M, 0.1 M, 0.15 M and 0.2 M of NiCl2 were prepared via sol-gel technique. The prepared gels were dried, grinded, pressed into pellets and sintered at 400 °C, 800 °C, 1000 °C and 1300 °C. The electrical resistivity and activation energy of the composites have been measured and the variation of resistivity with concentration of the nickel ion doping has been investigated. The resistivity decreases with the concentration of nickel ions. X-ray analysis confirms the presence of Ni2+ ions in mullite. The Ni2+ ion, which substitutes Al3+ ion in the octahedral site of mullite structure, can be considered as an efficient factor in reducing the resistivity. The mullite unit cell parameters suggest predominant incorporation of NiCl2 in a glassy phase. The lowest activation energy of resistivity (Eact ) that was achieved is 1.22 eV at 0.02 M.

16

Water sorption and blistering of GFRP laminates with varying structures

Landowski M., Budzik M., Imielińska K.

Advances in Materials Science

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2012

|

Vol. 12, nr 4(34)

23-29

EN

The microstructures, water absorption as well as blistering was studied for bi- and tri- axial glass fibre vinyl ester and polyester -matrix laminates coated with gel coat layer and uncoated. The effect of manufacturing technique on water sorption characteristics was considered. It was found that water sorption characteristics of GFRP depend on manufacturing methods. The least water intake was found for specimens having perfect microstructure due to manufacturing by infusion process. Water sorption saturation value was reached after ca. 50 days of accelerated test at 70°C and was found to correspond to 250 days conditioning at 20°C. Blistering evolution was illustrated and SEM images shown corresponding to degradation of the gel coat layer and the laminate during the exposure in water.

17

(Bi2Te3)0:25(Sb2Te3)0:75 crystal structure improvements with excess Te as studied by AFM, SEM, EBSD and XRD

Kavei G., Ahmadi K., Shadmehr A. K., Kavei A.

Materials Science Poland

|

2011

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Vol. 29, No. 2

144--151

EN

(Bi2Te3)x(Sb2Te3)1-x solid solutions with x = 0:2, 0.25 and 0.3 - p type thermoelectric compounds with an excess of Tellurium dopant up to 4 wt% were crystallized. By increasing the Bi2Te3 content in the Bi-Sb-Te system, the hole concentration decreased and in consequence caused an optimum Seebeck coefficient and a decrease in electrical conductivity and thermal conductivity, thus resulting in an increase in the figure of merit at x = 0:25. The results showed that optimum thermoelectric properties can be achieved for a mixture of x = 0:25 with 3 wt% Te added. Structural characterizations of this compound in the absence and presence of the dopant were carried out by means of X-Ray diffraction measurement, scanning electron microscopy, electron backscattering diffraction and atomic force microscopy. Detailed analyses confirm that the improvements in thermoelectric parameters due to the intrinsic structure and minimum defects during crystallization of the compounds result from the excess of Te.

18

The influence condition of electro-spark alloying by Al and sequent laser treatment on surface layer of steel GradeB A284

Smolina I., Franchik N., Lobachova G.

Challenges of Modern Technology

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2011

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Vol. 2, no. 3

25--28

EN

In the present paper structure and properties of alloying by aluminum surface layer of steel GradeB A284, which were obtain by electro-spark alloying (ESA) and sequent laser treatment (LT) are described. The properties of coatings were investigated by SEM and X-ray diff raction, microstructure and microhardness analysis. It has been shown that next laser treatment can increase the depth of hardened layer doped with 50 to 80…100 μm, but in comparison with ESA, reduces the value of microhardness from 10 to 5 GPa.

19

On degradation of glass/polyester laminate immersed in water

Landowski M., Budzik M., Imielińska K.

Advances in Materials Science

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2011

|

Vol. 11, nr 1(27)

35-39

EN

Mechanical behaviour was compared for glass/ polyester laminates manufactured in the boatbuilding plant using three methods: hand lay-up, vacuum bagging, infusion. Specimens were tested in dry condition and following accelerated water immersion test (700C- corresponding to the exposure of 30 years at 190C). In three point bending test 40-50% reduction in laminate strength was observed due to water immersion. The highest degradation was in samples manufactured using hand lay-up method, the differences in strength between both vacuum methods were insignificant. Interlaminar shear strength was reduced by 25% for infusion method which is recommended as the most efficient. Matrix plasticization and debondings as well as surface microcracks were responsible for reduction in strength for water conditioned specimens. However, no microstructural difference in type or intensity of internal damage was observed for the three sample types.

20

Fabrication and electrochemical properties of diamond layers grown on tungsten wire by HF CVD method

Torz-Piotrowska R., Uniszkiewicz C., Szreiber M., Wrzyszczynski A., Staryga E., Runka T., Kasprowicz D.

Optica Applicata

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2009

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Vol. 39, nr 4

951-957

EN

Un-doped polycrystalline diamond thin films have been grown on tungsten substrates by hot filament chemical vapor deposition (HF CVD) using a hydrogen and methanol vapor mixture. Diamond films have been analyzed by Raman spectroscopy and scanning electron microscopy (SEM). Cyclic voltammetric behavior of diamond films of different quality and morphology has been studied in acetonitryle with (n-Bu)4NClO4 and in 0.1 M KCl aqueous solutions. Preliminary cyclic voltammetry (CV) measurements showed that our electrodes have a wide potential range over which negligible background response current is observed. The potential windows depend on the type of solvent. In the case of water solution the decomposition of water occurs electrochemically and evolves O2 during positive (anodic) polarization and H2evolution during negative (cathodic) polarization. The electrochemical properties of diamond electrodes have been evaluated by performing cyclic voltammetry measurements in [Fe(CN)6]3-/4- with 0.1 M KCl. The electrode demonstrates reversible kinetics during electrochemical analysis.