Sintered Ceramic Materials

1770 WordsFeb 24, 20187 Pages
Where Nc= number of molecules per unit cell (Z=8), A= molecular weight of Cu0.5Ni0.5Fe2O4 (236.81 g.mole-1), Vc= unit cell volume (584.172x10-24cm3) and Na=Avogadro’s number (6.023x1023 molecules.mole-1). The measured theoretical density (ρth) was found to be 5.3844g.cm-3. The apparent density of pellet specimens sintered at 850oC and 1050oC was measured by using Ultrapycnometer 1000 which was varified by Archimedes buoyancy Principle and was found to be 4.8 g.cm-3 and 5.02 g.cm-3 respectively. These densities were 91.38% and 93.23% of the theoretical values (% relative densities). Percentage porosity [59] of sintered pellet specimens was found to be 8.2% and 6.8% respectively. It is observed Cu0.5Ni0.5Fe2O4 sintered ceramic composed of uniformly sized grains and is >93% relative density. The high sintered density can be attributed due to the small degree of agglomeration and fine nature of powder. The properties of sintered ceramic materials depend upon the sintered density and porosity of ceramic. It is well known that during sintering of homogeneous materials, the porosity decreases and the microstructures of the material develop, depending upon the morphology, agglomeration and sintering conditions. The Cu0.5Ni0.5Fe2O4 specimen sintered at 850oC has lower %relative density as compared to specimen sintered at 1050oC. Surface morphology Figure 5 shows the SEM images of Cu0.5Ni0.5Fe2O4 synthesized powder dried at 90oC in vaccum (Fig.5a) and calcined at 850oC for 4h
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