Synthesis and consolidation of copper/chromium oxide nanocomposite powders via pressureless and spark plasma sintering
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Copper/chromium oxide (75%wt) nanocomposite powders were synthesized via chemical precipitation process. The processwas included chemical precipitation of Cr-Cu containing precipitates, calcination and reduction of the precipitates. Based onthermogravimetric analysis of the precipitates, the optimum calcination temperature was determined as 700 oC. Thesynthesized powders were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Theobservations revealed that the powder particles were agglomerated and their shape was mainly spherical. The powders weredensified via spark plasma and presssureless sintering at 1000 oC and 1100 oC, respectively. The microstructural evaluation ofthe spark plasma sintered samples confirmed a near dense structure with a fine dispersion of the constituents. However, themicrostructure of the pressureless sintered specimen showed a large number of pores between the powder particles. Therelative density and micro-hardness of the spark plasma sintered samples were 95.8% and 1600 HV, respectively.
Abstract
Copper/chromium oxide (75%wt) nanocomposite powders were synthesized via chemical precipitation process. The processwas included chemical precipitation of Cr-Cu containing precipitates, calcination and reduction of the precipitates. Based onthermogravimetric analysis of the precipitates, the optimum calcination temperature was determined as 700 oC. Thesynthesized powders were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Theobservations revealed that the powder particles were agglomerated and their shape was mainly spherical. The powders weredensified via spark plasma and presssureless sintering at 1000 oC and 1100 oC, respectively. The microstructural evaluation ofthe spark plasma sintered samples confirmed a near dense structure with a fine dispersion of the constituents. However, themicrostructure of the pressureless sintered specimen showed a large number of pores between the powder particles. Therelative density and micro-hardness of the spark plasma sintered samples were 95.8% and 1600 HV, respectively.
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