CuO-NiO 혼합분말의 동결건조 및 수소환원에 의한 Cu-Ni 다공체 제조
Fabrication of Porous Cu-Ni by Freeze Drying and Hydrogen Reduction of CuO-NiO Powder Mixture
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초록
Cu-Ni alloys with unidirectionally aligned pores were prepared by freeze-drying process of CuO-NiO/campheneslurry. Camphene slurries with dispersion stability by the addition of oligomeric polyester were frozen at -25oC,and pores in the frozen specimens were generated by sublimation of the camphene during drying in air. The green bodieswere hydrogen-reduced at 300oC and sintered at 850oC for 1 h. X-ray diffraction analysis revealed that CuO-NiOcomposite powders were completely converted to Cu-Ni alloy without any reaction phases by hydrogen reduction. Thesintered samples showed large and aligned parallel pores to the camphene growth direction, and small pores in the internalwall of large pores. The pore size and porosity decreased with increase in CuO-NiO content from 5 to 10 vol%. The change of pore characteristics was explained by the degree of powder rearrangement in slurry and the accumulationbehavior of powders in the interdendritic spaces of solidified camphene.
Abstract
Cu-Ni alloys with unidirectionally aligned pores were prepared by freeze-drying process of CuO-NiO/campheneslurry. Camphene slurries with dispersion stability by the addition of oligomeric polyester were frozen at -25oC,and pores in the frozen specimens were generated by sublimation of the camphene during drying in air. The green bodieswere hydrogen-reduced at 300oC and sintered at 850oC for 1 h. X-ray diffraction analysis revealed that CuO-NiOcomposite powders were completely converted to Cu-Ni alloy without any reaction phases by hydrogen reduction. Thesintered samples showed large and aligned parallel pores to the camphene growth direction, and small pores in the internalwall of large pores. The pore size and porosity decreased with increase in CuO-NiO content from 5 to 10 vol%. The change of pore characteristics was explained by the degree of powder rearrangement in slurry and the accumulationbehavior of powders in the interdendritic spaces of solidified camphene.
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