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RISS 인기검색어
- 검색키워드
- 저자 : Tahsin Boyraz (검색결과 4 건)
- 무료
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Burcu Ertug,Tahsin Boyraz,Okan Addemir 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.4
Barium titanate samples were prepared by a traditional powder metallurgy method. High-purity powders were mixed by ballmilling in order to produce powder mixtures. The resultant mixtures were dried, sieved and were uniaxially pressed into green samples. Green samples were then sintered at 1200-1500oC for 6 h in air to form a barium titanate phase. The average grain size and microstructural features were determined for each composition. The effects of porosity and working temperatures on the barium titanate ceramics were investigated by microstructural analysis and electrical conductivity measurements and the results were evaluated in terms of porosity.
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Fabrication and characterization of aluminium titanate and mullite added Porcelain ceramics
Ahmet Akkus,Tahsin Boyraz 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.1
In this study, aluminium titanate (AT, Al2TiO5) and mullite (M, 3Al2O3·2SiO2) ceramics were synthesized by reaction sinteringfrom Al2O3, SiO2 and TiO2 powders which consisted of homogenization by wet ball milling followed by sintering AT and Min air at 1550 oC for 2 hrs and 1400 oC for 2 hrs, respectively. AT and M in different amounts (0 and 20 wt. %) were mixedwith Porcelain (P). AT and M reinforced porcelain ceramics were prepared by the powder metallurgy route. After drying, thepowders were compressed to preforms of 56x12x10 mm by uniaxial pressing at 200 MPa. The green compacts were sinteredat 1100-1200 oC for 1-5 hr under air. Investigations were carried out, on the effect of addition of AT and M in terms of physicalproperties, microstructure, XRD phases, as well as wear and mechanical properties of AT and M-reinforced porcelain ceramiccomposites. Phase and microstructural characterizations of the sintered materials were carried out by using X-ray diffractiontechnique (XRD) and scanning electron microscope (SEM). The Micro Vickers hardness testing was performed using theShimadzu HMV-MIII hardness tester.
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Ahmet Akkus,Tahsin Boyraz 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.3
Stabilized zirconia has superior high temperature properties such as high tolerance for thermal shock, low thermalconductivity, mechanical properties, elevated melting point, good phase stability and excellent oxidation resisNtance. Thepresent paper describes the fabrication and wear behaviour of 8 mole% CaO, 4 mole % CaO-4 mole% MgO and 8 mole%MgO - stabilized zirconia (ZrO2) based composites fabricated by the conventional ceramic production process. CaO/MgOadded stabilized zirconia ceramics were fabricated by using a combined method of ball milling, cold press-cold isostaticpressing and sintering. The powder blends containing different amounts of % 8 mole CaO/MgO were wet-milled for 1 hr ina vibratory ball-mill using zirconia vial and balls. After drying, powders were compacted to cylindrical preforms with adiameter of 12.7 mm by uniaxial pressing at 300 MPa and by cold isostatic pressing at 300 MPa. The green compacts weresintered at 1600 oC for 3 hrs under air. Phase and microstructural characterizations of the sintered materials were carried outby using X-ray diffraction technique (XRD) and scanning electron microscope (SEM). The Micro Vickers hardness testing wasperformed using the Shimadzu HMV-MIII hardness tester. Plint brand abrasion tester was used for the abrasion tests ofceramics. As a result, it has been observed that the hardness is increased by increasing the amount of MgO and the ceramicsproduced by cold isostatic pressing are harder.
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Israfil Kucuk,Tahsin Boyraz 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.1
3 mole % yttria stabilized zirconia (YSZ) ceramic and 20 wt. % mullite (M), and 20 wt. % aluminium titanate (AT) reinforcedYSZ ceramic composites were produced using a conventional ceramic production process. After a combined method of wetball milling and dry pressing, these samples were sintered at 1500 oC and 1600 oC for 1hr and 5hrs, respectively. Physicalproperties, microstructural and phase characterizations of the sintered samples were analyzed using Archimedes method, ascanning electron microscope with energy dispersive spectroscopy and X-ray diffraction technique, respectively. Thereafter,micro Vickers and three-point bending tests were performed. The density, relative density and firing shrinkage of the sinteredsamples increased with addition of M and AT and the increased sintering temperature at each time. However, both porosityand loss of water properties determined were inversely proportional to M and AT addition and sintering temperature and timeincrease. An increase in M and AT content influenced the grain morphology as is presented in the microstructures of thecomposites produced thus bringing about a rise in grain size, as well as homogeneity and density in YSZ samples. Promisingresults were observed with the Vickers and bending strength in the mullite reinforced YSZ samples sintered at 1600 oC for 5hrsdue to mullite addition, which provides excellent mechanical features to the YSZ ceramic composites.
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