By applying HF treatment to Ni-Zr amorphous alloy, to obtain a porous Ni, as shown in Fig. 1 (a) of the SEM photograph. Samples subjected to oxygen treatment at 423 K in this sample, the holes are uniformly present, had a finer structure (Fig. 1 (b)). Further the sample subjected to oxygen at elevated temperature and found that holes are crushed, oxygen treatment of moderate temperature led to finer surface structure. Also, the samples were vacuum heat treated at 423 K, there are sparse irregular pore size, the introduction of oxygen, not only heating is an important factor in miniaturization.
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