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RISS 인기검색어
- 검색키워드
- 저자 : Fatai Olufemi Aramide (검색결과 3 건)
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Fatai Olufemi Aramide,O. D. Adepoju,Abimbola Patricia Popoola 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.6
Effects of additives on phase development and physico-mechanical properties of mullite-carbon was investigated. Powderedclay, kaolinite and graphite of predetermined compositions were blended with additives using ball mill for 3 hrs at 60 rev/min. Samples were produced by uniaxial compression and sintered between 1400 oC and 1600 oC for one hr. They werecharacterized for various properties, developed phases and microstructural features. It was observed that the properties andphase developments in the samples were influenced by the additives. 10 wt % SiC served as nucleating point for SiC around1400 oC. 10 wt % TiO2 lead to development of 2.5 wt % TiC at 1500 oC which increased to 6.8 wt % at 1600 oC. Ifon clay inthe sample leads to development of anorthite and microcline in the samples. 10 wt % TiO2 is effective as anti-oxidant forgraphite up to 1500 oC. Base on strength and absorbed energy, sample C (with 10 wt % TiO2) sintered at 1500 oC is consideredto be optimum.
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Fatai Olufemi Aramide,Abimbola Patricia Popoola 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.2
Effects of Ifon clay and sintering temperature on the phase development and physico-mechanical properties of mullite-carbonceramic composite was investigated. Powders of Ifon clay, kaolin from Okpella and graphite of known mineralogicalcomposition were thoroughly blended in a ball mill for 3 hrs at a speed of 60 rev/min using a predetermined ratio. From theblended powders, standard samples were produced by uniaxial compression. This was followed by sintering in an electricfurnace at 1400 oC, 1500 oC and 1600 oC for 1 hr. The sintered samples were characterized for various physical and mechanicalproperties. It was observed that; Ifon clay addition to the sample favours the formation of microcline in preference to mulliteat temperature between 1400 oC and 1500 oC. As the sintering temperature increases to 1600 oC there is the formation ofmullite phase and pores. These pores allowed the graphite content of the samples to be oxidized leading to reduction in thegraphite content of the samples. The addition of Ifon clay improved on some of the mechanical properties of the samples likethe cold crushing strength and Young’s Modulus compared to the earlier reported samples without Ifon clay. The sample withoptimum physico-mechanical is considered to be the sample sintered at 1400 oC.
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Fatai Olufemi Aramide,Patricia Abimbola Popoola 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.8
The effect of niobium oxide additives and sintering temperature on the phase developments and physico-mechanical propertiesof zirconia-clay ceramic composite was investigated. The clay of known mineralogical composition was source from a largedeposit in Ile-Ife, in Osun State Nigeria. The beneficiated clay, was milled to a particle size of 300 µm. The milled clay wasblended with varied percentages of yttria stabilized zirconia and niobium oxide powders in a tubular mixer for 18 hours ata speed of 72 rev/min. From the blended powders, standard samples were produced by uniaxial compression. This wasfollowed by sintering in an electric furnace at 1200 oC and 1300 oC for one hour. The sintered samples were characterized forvarious physical and mechanical properties. The phases developed in the sample during sintering were also investigated usingX-ray diffractometer (XRD). Morphology and microanalysis of the sintered ceramic composite samples were determined usingultrahigh resolution field emission scanning electron microscope (UHR-FESEM) equipped with energy dispersive spectroscopy(EDS). It was observed that at 1200 oC the presence of niobium oxide in the samples favours the decomposition of zircon tosilica phases and zirconia. It was also observed that the combined effects of increased sintering temperature to 1300 oC andaddition of niobium oxide favour the formation of more sillimanite in preference to mullite. At 1200 oC niobium oxide additiveinhibits the formation of mullite in preference to the formation of aluminum niobate and sillimanite. It also favoursdecomposition of zircon to the silica phases and zirconia. Increase in the niobium oxide content lead to increased bulk densityat 1300 oC. It was concluded that the sample with optimum physico-mechanical properties is considered to be sample FT2 with10% ZrO2, 0% Nb2O5, 90% clay and sintered at 1300 oC held at the sintering temperature for 60 minutes
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