Abstract
Cellular nickel with very high porosity around 85–91vol% comprising unidirectionally oriented micrometer-sized cells was fabricated using a novel gelation freezing (GF) method. Nickel particles were mixed with a gelatin solution and the gel bodies were frozen from −10 to −40°C, dried under a vacuum, reduced, and then sintered. Microstructural observations of the sintered bodies showed honeycomb-like morphologies derived from the growing ice crystals in gel bodies. The cell size ranging from 45 to 176μm could be modulated by changing solid loading in the initial slurry and freezing temperatures. The proposed method is a simple procedure for the production of cellular nickel with tailored pore architectures.
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