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pp.34-38
Cu-Ni alloys with unidirectionally aligned pores were prepared by freeze-drying process of CuO-NiO/cam-phene slurry. Camphene slurries with dispersion stability by the addition of oligomeric polyester were frozen at -25˚C,and pores in the frozen specimens were generated by sublimation of the camphene during drying in air. The green bod-ies were hydrogen-reduced at 300˚C and sintered at 850˚C for 1h. 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 inter-nal wall 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.
