Synthesis of porous Cu-Sn using freeze-drying process of CuO-SnO2/camphene slurries

초록

Porous Cu-Sn with controlled pore characteristics was synthesized by a freeze-drying and sintering process. CuO and SnO2 powders were selected as the source material, which are hydrogen-reduced to metallic Cu-Sn in the sintering stage. Camphene-based CuO-SnO2 slurries were prepared by milling at 60 A degrees C with a small amount of dispersant. Freezing of a slurry was done at -40 A degrees C with unidirectional control of the growth direction of the camphene. Pores were generated by sublimation of the camphene. The green bodies were sintered at 650 A degrees C under a hydrogen atmosphere. The sintered bodies with Cu3Sn, Cu6Sn5 and beta-Sn phases showed macroscopic aligned pores with an average size of 200 mu m. The internal wall of the macroscopic pores is also porous, and there are a number of many small pores in it. The formation of macroscopic and microscopic pores was discussed in terms of solidification behavior of the liquid with foreign particles.

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