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Wyszukujesz frazę "free sintering" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
LMO Ceramics Microstructure
Autorzy:
Bruś, B.
Zarycka, A.
Powiązania:
https://bibliotekanauki.pl/articles/350959.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LMO
microstructure
hot pressing
free sintering
Opis:
The aim of this work was to characterize the microstructure of LMO type ceramics. The ceramics obtained by the free sintering at two temperatures 1473 K and 1573 K and two sintering times 6 and 12 h was the test material. One series was also obtained by the hot pressing method for a comparison. In all the cases the material synthesis was conducted by the solid-state reaction method at 1173 for 24 h. Photographs of the specimen fractures were taken by a scanning electron microscope to characterize the microstructure of the ceramics obtained in a more detailed way. The VISILOG 4 system, enabling to calculate a lot of parameters characterizing the material microstructure, such as e.g.: a number of grains on the unit area, an average grain size, shape indexes of the grains in question, was used as well. It allows determining a grain size distribution, and a frequency of presence of grains with the specific shape index. By analyzing a set of the parameters obtained an influence of the technological conditions on the microstructure of the material in question, and on its properties and applicability at the same time can be determined.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 857-862
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Particle Size and Sintering Temperatures on Electrical Properties of 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 Lead Free Ceramics
Autorzy:
Gul, Mert
Gurbuz, Mevlüt
Gokceyrek, Abdi B.
Toktaş, Aysegül
Kavas, Taner
Dogan, Aydın
Powiązania:
https://bibliotekanauki.pl/articles/353114.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lead-free
NBT-BT
particle size
sintering
electrical properties
Opis:
In this study, lead-free 0.94 Na0.5 Bi0.5 TiO3 -0.06BaTiO3 (NBT-BT) compositions at morphotropic phase boundary were successfully synthesized by solid-state reaction method. The effects of the particle size for various milling time (12-24-48 hours) and sintering temperatures (1100-1125-1150-1175°C for 2 h) on the electrical properties of the NBT-BT ceramics were evaluated. Experimental results showed that particle size and sintering temperatures significantly affect the electrical properties of NBT-BT ceramics. The particle size of the ceramic powders decreasing while milling time increases to 48 hours. Particle size values for 0, 12, 24 and 48 hours (h) milled powders were measured as nearly 1.5 μm, 1 μm, 700 nm, and 500 nm respectively. The bulk density enhanced with increasing sintering temperature and showed the highest value (5.73 g/cm3) at 1150°C for 48 h milled powder. Similarly, the maximum piezoelectric constant (d33 ) = 105 pC/N, electromechanical coupling coefficient (kp ) = 25.5% and dielectric constant (KT) = 575 were measured at 1150°C for 48 h milled powder. However, mechanical quality factor (Qm ) was reduced from 350 to 175 with decreasing particle size. Similarly, remnant polarization was dropped by decreasing powder particle size from 56 μC/cm2 to 45 μC/cm2.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 609-614
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sintered Ni-Free Structural Alloy Steels - Processing, Properties and Microstructure
Autorzy:
Sułowski, M.
Tenerowicz-Żaba, M.
Valov, R.
Petkov, V.
Powiązania:
https://bibliotekanauki.pl/articles/352525.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sintered Ni-free alloy steels
sintering atmosphere
mechanical properties
microstructure
Opis:
In this paper the development and method of production of modern, Ni-free sintered structural steels containing Cr, Mn and Mo, enabling the production of structural sintered steels in industrial conditions, using safe, with low H2-content, sintering atmospheres is presented. For this purpose, the analysis of microstructure and mechanical properties of these sintered structural steels produced in different processing conditions and also the connections between the microstructure of sintered material and its mechanical properties, was presented. Following the investigations, the appropriate chemical composition of sintered Ni-free steels with properties which are comparable or even better than those of sintered structural steels containing rich and carcinogenic nickel was choosen. Additionally, in the paper the properties of electrolitically coated carbon steels were presented, as the beginning of investigation for improving the mechanical properties of alloyed, structural sintered steels.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 851-860
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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