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- 저자 : Rahim Naghizadeh (검색결과 5 건)
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Jafar Baseri,Rahim Naghizadeh,Hamid Reza Rezaie 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.1
Alumina-spinel(NiAl2O4, CoAl2O4 solid solution)-metal(nickel, cobalt solid solution) composites were fabricated by partialreduction of spinel in carbon-bed and sintered with three different processes namely, pressureless, hot pressing, and sparkplasma sintering (SPS). The microstructural features and mechanical properties of composites were investigated. Thepressureless samples, SPS samples, and hot pressed samples reached > 91%, > 97% and > 98% theoretical density,respectively. The flexural strength of SPS, hot pressed, and pressureless samples were about 415 MPa, 367 MPa, and 247 MPa,respectively. Vickers Microhardness of SPS, hot pressed, and pressureless sintering were about 15.3, 14.5, and 10.98 GPa,respectively. The fracture toughness of SPS and hot pressed samples did not have a significant difference, and they were about7.2 and 7.8 MPa.m1/2, repectively
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Processing and properties of Ni dispersed zirconia toughened alumina
Mayssam Hussein Nabbouh,Rahim Naghizadeh,Farhad Golestani-Fard,Hamid Reza Rezaie 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.9
The combination of phase transformation of zirconia and plastic deformation of Ni metal has shown a significant improvement in toughness caused by the synergistic toughening. In the present study, the reduction process within a carbon bed, the effectof Ni content on densification, microstructure and mechanical properties of ZTA/Ni composites was investigated. Powder mixtures of Al2O3, 3YSZ, and nickel nitrate as a source of Ni metal were prepared by precipitated Ni on ceramic powders to obtained ZTA/Ni composites. The composites were pressureless sintered at 1600 o C for 3 hrs within a carbon powder bed. The results showed that the addition of 5 vol.% Ni results in the highest relative density of 93% and the maximum fracture strength and toughness values of 348 MPa and 3.32 MPa.m½, respectively.
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Mahdi Heidari Bagherabadi,Rahim Naghizadeh,Hamid Reza Rezaie,Mohsen Fallah Vostakola 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.3
For the synthesis of magnesium borate powder, magnesium carbonate and boric acid powders were mixed in ethanol and theninvestigated by differential thermal analysis (DTA) and thermogravimetry (TG). X-ray diffraction (XRD) results of thesamples showed the formation of Mg2B2O5 phase at 500 oC and Mg3B2O6 at 650 oC. The synthesized powder used as anantioxidant additive in magnesia-graphite bodies containing 20% graphite. After curing at 200 oC and firing at 1200 oC and1400 oC for 2 hrs in a coke bed environment, its physical and mechanical properties and also microstructural features wereinvestigated. The results showed that after curing at 250 oC, the addition of magnesium borate led to an increase in coldcrushing strength at about 20%. Comparing the samples with additives and without any additives at 1200 and 1400 oC showedthat the cold crushing strengths were improved about 45%, 35%, respectively. In addition, the results clarified that magnesiumborate (Mg3B2O6) phase led to improve oxidation resistance.
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Golsa Naderi,Ali ShokuhFar,Rahim Naghizadeh,S. Atashgar,Hamid Reza Rezaie 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.1
Tialite (Al2TiO5) is a ceramic material of very low thermal expansion coefficient, excellent thermal shock resistance, high refractoriness and good corrosion resistance. However, industrial applications of this material are hindered by two major limitations: decomposition to its parent oxides, alumina and rutile between 800 and 1280 oC and its low thermal mechanical properties. In the present study addition of talc with a good stabilizing effect has been studied on aluminum-titanate (tialite)- based ceramics. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the effect of talc on phase evolutions, sintering, and the microstructure of aluminum-titanate, and also density measurements were performed after sintering. The results showed that the presence of talc reduces the unreacted alumina and rutile significantly. The formation of Mg0.3Al1.4Ti1.3O5 and other solid solutions of MgO and aluminum-titanate were observed. Tialite (Al2TiO5) is a ceramic material of very low thermal expansion coefficient, excellent thermal shock resistance, high refractoriness and good corrosion resistance. However, industrial applications of this material are hindered by two major limitations: decomposition to its parent oxides, alumina and rutile between 800 and 1280 oC and its low thermal mechanical properties. In the present study addition of talc with a good stabilizing effect has been studied on aluminum-titanate (tialite)- based ceramics. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the effect of talc on phase evolutions, sintering, and the microstructure of aluminum-titanate, and also density measurements were performed after sintering. The results showed that the presence of talc reduces the unreacted alumina and rutile significantly. The formation of Mg0.3Al1.4Ti1.3O5 and other solid solutions of MgO and aluminum-titanate were observed.
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Elaheh Khosh Omid,Rahim Naghizadeh,Hamid Reza Rezaie 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.4
MgAl2O4-Ti (C, N) composites were synthesized through aluminothermic-carbothermal reduction and molten salts synthesis (MSS) routes in coke bed conditions. The phases were characterized using X-ray diffraction (XRD) and microstructures of composites were investigated by scanning electron microscopy (SEM). The results showed that the synthesis temperature of MgAl2O4-Ti (C, N) was decreased about 300 o C in MSS method in comparison with aluminothermic-carbothermal reduction. The KCl and NaCl salts proved better transportation path for reactant species and accelerate composite formation and also establish the microstructure with homogenous and fine grains.
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