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RISS 인기검색어
- 검색키워드
- 저자 : Ercenk (검색결과 3 건)
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The glass-ceramic sealant materials obtained from basalt for SOFC
Ediz Ercenk,A. Elif Cicekli,Senol Yilmaz 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.12
In the current study, utilization possibilities of the basalt based glass-ceramic as a sealant material for solid oxide fuel cell(SOFC) were investigated. Crushed, milled and sieved basalt powders were modified by some additives. The basalt powderand modified mixture were separately melted in alumina crucible and cast into water to obtain glass granules. These granuleswere milled, and exposed to heating microscopy and differential thermal analysis (DTA). Some parameters such as glasstransition and softening temperature were determined by these analyses. The powders were applied on the Crofer 22 APUinterconnector material, and heat treatment was carried out. The interface characteristics between the glass-ceramic layer andinterconnector were characterized using X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). Theresults showed that the basalt base glass-ceramic sealant material exhibited promising properties to use for SOFC.
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Grain growth kinetics in the xAl2O3−6wt. % Bi2O3 − (94-x) ZnO (x = 0, 2, 4) ceramic system
Ediz Ercenk,Senol Yilmaz,H. Ozkan Toplan,Volkan Gunay 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.5
The effects of the amount of Al2O3 (0, 2 and 4 wt.%) on the microstructural properties have been studied in a binary ZnO-6 wt% Bi2O3 system. The microstructure of the samples consists mainly of ZnO grains with β-Bi2O3 and ZnAl2O4 spinel as the secondary phases. The grain growth kinetics in the 0, 2 and 4wt.% Al2O3 added ZnO-6wt.% Bi2O3 system were studied using the simplified phenomenological grain growth kinetics equation together with the physical properties of the sintered samples. The grain growth exponent value (n) and the apparent activation energy for the ZnO-6 wt.% Bi2O3 system were 5 and 218 kJ/mol, respectively. The addition of the Al2O3 to the ZnO-6 wt.% Bi2O3 system inhibited the ZnO grain growth. At 2 and 4 wt.% Al2O3 additions, the apparent activation energies were calculated as 341 and 578 kJ/mol respectively. The addition of Al2O3 to the system inhibited the grain growth of ZnO ceramics. The effects of the amount of Al2O3 (0, 2 and 4 wt.%) on the microstructural properties have been studied in a binary ZnO-6 wt% Bi2O3 system. The microstructure of the samples consists mainly of ZnO grains with β-Bi2O3 and ZnAl2O4 spinel as the secondary phases. The grain growth kinetics in the 0, 2 and 4wt.% Al2O3 added ZnO-6wt.% Bi2O3 system were studied using the simplified phenomenological grain growth kinetics equation together with the physical properties of the sintered samples. The grain growth exponent value (n) and the apparent activation energy for the ZnO-6 wt.% Bi2O3 system were 5 and 218 kJ/mol, respectively. The addition of the Al2O3 to the ZnO-6 wt.% Bi2O3 system inhibited the ZnO grain growth. At 2 and 4 wt.% Al2O3 additions, the apparent activation energies were calculated as 341 and 578 kJ/mol respectively. The addition of Al2O3 to the system inhibited the grain growth of ZnO ceramics.
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Crystallization kinetics of mica glass-ceramic in the SiO2-Al2O3-MgO-K2O-B2O3-F2 System
Ediz Ercenk,Senol Yilmaz 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
A mica glass-ceramic in the SiO2-Al2O3-MgO-K2O-B2O3-F2 glass system was prepared by a melting method. The crystallization behaviour and crystallization kinetics of a sample with glass-ceramic composition were examined. DTA and XRD analysis revealed the crystallization of phlogopite, fluorphlogopite, clinohumite and spinel phases. The activation energies for the precipitation of crystalline phases have been evaluated, and the crystallization mechanisms have been studied by applying DTA measurements performed at various heating rates. The results indicate that the growth of mica is a twodimensional process controlled by the crystal-glass interface reaction. The average calculated values of crystallization and viscous flow for the precipitation of crystal phases from the glass matrix were measured to be 289.9 ± 8 kJ/mol and 348.7 ± 14 kJ/mol, respectively. The mica glass-ceramics exhibited excellent performance in machinability tests without cracking or deforming.
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