Abstract
The preparation of Mn-Zn ferrites composed of fine grains has been carried out by hot pressing under various conditions. The results obtained are summarized as follows. (1) α-Fe 2 O 3 was more liable to form in the specimen prepared by hot pressing than in that prepared by the conventional sintering under ordinary pressure due to the remaining O 2 in the specimen. Therefore, it was confirmed that the hot pressing process in vacuum was more suitable than in 1%O 2 or N 2 . (2) Mn-Zn ferrites whose grain size is about 2 μm was obtained by the process where the specimen was heated to 1248 K at the heating rate of 0.028 K/s, and isothermally held under 0 MPa for 1.8 ks and hot pressing under 40 MPa in the vacuum of 1.33 x 10 -2 Pa for the subsequent 1.8 ks at the same temperature of 1248 K, using coprecipitated Mn-Zn ferrites powders. (3) Mn-Zn ferrites powder whose grain size is extremely fine of about 10-20 nm was obtained by the MG process in Ar, and it was confirmed that using these powders, Mn-Zn ferrites specimen whose grain size is finer than 1 μm was prepared by the above mentioned hot pressing process.
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