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- 저자 : Cengiz Bagci (검색결과 2 건)
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Use of geopolymer-derived leucite as a reinforcement in dental bioceramic composites
Cengiz Bagci 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.4
Leucite (K2O·Al2O3·4SiO2) converted from geopolymers as a sustainable approach, was used as an alternative to feldspar, oneof the three components of dental ceramics. Leucite crystals were obtained from a dried potassium geopolymer of thecomposition K2O·Al2O3·4SiO2·11H2O by heating at 1200 oC for 3 h in an open-air furnace. Produced leucite was crushed intosmall parts, powdered in a planetary mill and then sieved to sub-63 micron size. Leucite crystals were then replaced byfeldspars at a range from 0-100 (wt.%) in all three parts of dental ceramic slurries. The slurries were molded to 1 cm3 andsubsequently heat-treated at 1300 oC-1450 ºC/4.5 h with a heating rate of 10 ºC/min. Final products were microstructurallycharacterized with XRD, SEM-EDS and mechanically based on Weibull analysis of compressive tests. Due to the phasetransformation occurring in leucite, it was determined that the amount of leucite had a significant effect on the structuralintegrity and therefore the mechanical properties of the final dental material. Results of the statistical analysis showed that thereplacement of 50% leucite exhibited the highest compressive strength of (49.3±10.5 MPa) compared to the other samplesconsistent with microstructural analysis.
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Cengiz Tatar,Dilek Bagci,Omer Kaygili 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.5
In the present study, the effects of high amounts of Al and Zn additives on the crystal structure, phase composition andmicrostructure of hydroxyapatite (HAp) samples synthesized by sol-gel route were investigated by X-ray diffraction (XRD),Fourier transformation infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) techniques. The values of thecrystallinity percent, crystallite size, lattice parameter of a and volume of the unit cell decrease gradually with increasingamount of the co-additives. The formation of the new phases is observed and these phases become dominant with increasingamount of Al and Zn. The morphology of HAp, shape and size of the particles are also affected by the amount of Al and Zn. As expected, a gradual decrease in the Ca/P molar ratio is observed.
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