PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 8

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  X-ray methods
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available The Application of the Mechanochemical Synthesis for the Preparation of Advanced Ceramics Based on Barium Titanate
Garbarz-Glos B., Bąk W., Budziak A., Dulian P., Lisińska-Czekaj A., Czekaj D.
Archives of Metallurgy and Materials
|
2020
|
Vol. 65, iss. 4
1391--1396
EN
In the present study, the lead-free BaTi1-x Zrx O3 (for x = 0, 0.05 and 0.15) ceramics were prepared by High-Energy Ball Milling and heat treatments. The performed X-ray, SEM and EDS measurements confirmed high purity, good quality and the expected quantitative composition of the obtained samples. The study of dielectric properties was performed by means of broadband dielectric spectroscopy at the frequency ranging from 0.1 Hz to 10 MHz. The obtained measurement data, analyzed in accordance with the Arrhenius formalism demonstrated the presence of relaxation type dielectric mechanisms. The impedance answer of studied ceramic materials indicated the presence of two relaxation processes: one with a dominant resistive component and the other with a small capacitive component. The observed dielectric relaxation process is temperature dependent and has a “non-Debye” character.
2
Content available Study of phase transition in Bi3TiNbO9-BaBi2Nb2O9 ceramics
Adamczyk M., Kusz J., Hofmeister W., Zubko M., Kozielski L., Pilch M., Bochenek D., Wodecka-Duś B.
Archives of Metallurgy and Materials
|
2016
|
Vol. 61, iss. 3
1503--1510
EN
The subject of the paper is lead free bismuth layer structure oxides (1-x)Bi3TiNbO9-xBaBi2N2O9(x=0; 1; 2; 3 mol). The influence of Bi3TiNbO9/BaBi2Nb2O9 ratio on dielectric and structural properties was studied in a wide range of temperatures. Change in the ratio causes a decrease in the maximum value of dielectric permittivity and shifts the temperature of ε`max to low values, leading to linear decreasing of average grain size and linear increasing of ceramics density. These results indicate an augment of the packing degree and the participation of pores are significantly decreased with the increase of BaBi2Nb2O9compound intake. Moreover, for 0.7Bi3TiNbO9-0.3BaBi2Nb2O9 ceramics the dielectric phase transition is broadened and the properties characteristic for the ferroelectric relaxor appear.
3
Content available Synthesis of ZnO nanoparticles by thermal decomposition of basic zinc carbonate
Hutera B., Kmita A., Olejnik E., Tokarski T.
Archives of Metallurgy and Materials
|
2013
|
Vol. 58, iss. 2
489--491
EN
The paper presents a method for obtaining nanoparticles of ZnO by thermal decomposition of the Zn-containing compounds. The experiment was based on the thermal decomposition of basic zinc carbonate to zinc oxide (with a content of 58-61 wt.%). Basic zinc carbonate was analysed by derivatography and then annealed at a selected temperature (about 600ºC) for about 1 h. Products of thermal decomposition of the compound were studied by XRD analysis and SEM scanning microscopy.
PL
W pracy zaprezentowano metodę otrzymywania nanocząstek ZnO na drodze termicznego rozkładu związków zawierających Zn. W eksperymencie wykorzystano termiczny rozkład zasadowego węglanu tlenku cynku (o zawartości od 58-61% mas.). Zasadowy węglan cynku poddano analizie derywatograficznej a następnie wygrzewaniu w określonej temperaturze (ok. 600ºC przez ok. 1 godz.). Produkty termicznego rozkładu związku badano analizą XRD oraz mikroskopia skaningowa SEM.
4
Content available Wykrywanie wewnętrznych wad materiałowych w pierścieniach łożysk tocznych
Zbrowski A., Matecki K.
Problemy Eksploatacji
|
2012
|
nr 2
229-243
PL
W artykule przedstawiono problemy związane z występowaniem wad struktury materiałowej w pierścieniach łożysk tocznych. Zaprezentowano przykłady zidentyfikowanych wad materiałowych. Za pomocą wytypowanych metod defektoskopowych przeprowadzono badania porównawcze w celu wytypowania metody diagnostycznej dogodnej do zastosowania w wielkoseryjnej, 100% kontroli jakości pierścieni łożyskowych, prowadzonej on-line na linii produkcyjnej. Badania przeprowadzono z zastosowaniem metody wizualnej, magnetycznej, wiroprądowej i rentgenowskiej. Na podstawie uzyskanych wyników badań wytypowano metodę prądów wirowych jako optymalne rozwiązanie systemu do automatycznej inspekcji wewnętrznych wad materiałowych w pierścieniach łożysk tocznych. Przeprowadzone badania zrealizowano w celu sformułowania koncepcji i zasady działania takiego systemu.
EN
The article presents problems related to the occurrence of structural defects in roller bearing rings and shows the examples of the identified material defects. With the use of selected defectoscopy methods, comparison tests have been conducted in order for the proper method to be selected for the application in an online multi-series quality control of bearing rings in a production line environment. The tests have been carried out with the use of the visual, magnetic, eddy current, and X-ray methods. On the basis of the obtained results, the eddy current method has been chosen as an optimal system solution for the automatic inspection of internal structural defects in roller bearing rings. The aim of the tests was to formulate the idea and the principle of the operation of such a system.
5
Content available remote Activator - Induced Modification of Selected Properties of Heat Generating Fe-KClO4 Mixture
Wachowski L., Czajka B.
Central European Journal of Energetic Materials
|
2006
|
Vol. 3, nr 1-2
51-63
EN
The effect of the kind (Zn, Mo, or Ti) and amount (the concentration range 0-5 wt.%) of the metallic powder used as an activator introduced into the highly calorific mixture of Fe and KClO4 has been studied. In all samples studied, with increasing amount of the activator introduced into the system Fe-KClO4 the energy effect has been found to increase in the following sequence Ti
6
Content available remote Physicochemical Properties of Iron Powders Used as Reducing Agents in Materials of High Calorific Value
Czajka B., Tabat S., Styczyński S., Wachowski L., Zieliński M., Pietrowski M.
Central European Journal of Energetic Materials
|
2004
|
Vol. 1, nr 1
75-88
EN
The paper reports physical and chemical characterisation of commercial preparations of iron powder and their solid-state reactivity with potassium chlorate(VII). The samples of the commercial products were subjected to: granulometric analysis, SEM observations, low-temperature adsorption and desorption of nitrogen, surface area determination by BET, XRD study of the phase composition and TPR. Iron(II) oxide present on the surface of iron powders acts as a catalyst in thermal decomposition of KClO4. The iron powders were analysed in the aspect of their possible application as components of conducting heating mixtures in thermally activated primary batteries.
7
Content available remote Bones characterisation with ultrasound
Litniewski J., Nowicki A., Sawicki A.
Engineering Transactions
|
2001
|
Vol.49, iss.2/3
165-177
EN
Macroscopic, X-ray methods for bone quality assessment are mainly based on porous bone density measurements. The bone quality is a property that is difficult to define, as it is related to both density and structure of the bone. In recent years, several new ultrasonic diagnostic methods have been developed to examine bones "in vivo". These methods are based on measurements of the velocity (SOS - speed of sound) and attenuation (BUA - broadband ultrasound attenuation) of waves penetrating porous bones. The large interest in these methods is a result of the fact that they provide information not only about the bone density but also about their structure without using ionizing energy. The principal element that determines the bone strength is the trabecular structure of a porous bone. In our project we measure acoustic properties of a single trabecula using a scanning acoustic microscope and we introduce the system for "in vivo" measurement of an overall properties of a calcaneus (a heel bone).
8
Badania warstw HfO2 metodą AFM i metodami rentgenowskimi
Ciosek J., Pankowski P., Pełka J. B., Paszkowicz W., Baczewski L. T.
Elektronika : konstrukcje, technologie, zastosowania
|
2001
|
Vol. 42, nr 8-9
60-62
EN
Dielectric hafnia layers are used in laser mirrors for UV-IR ranges. They are characterised by unique properties, because except for their good resistively on high-energy laser beam, they also exhibit o low scattering level and low absorption coefficient for radiation from 0,25 u.m to 7 um. The layers were evaporated by PVD method with electron beam (EB) guns. Morphology of the experimental material's layers was studied by X-ray diffraction (XRD) and X-ray reflectometry (GIXR). Their radiation-damage threshold was investigated at wavelength of Nd:YAG laser. The analysis demonstrates a structural difference between HfO2 layers evaporated on the BK7 glass and on melted quartz susbstrates.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.