| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.39 ( October 1998 ) Electrical Steel ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of the Atmosphere Controlled
Roller Hearth Type Kiln for High Performance
Mn-Zn Ferrites Shin-ichi Kijima, Kiyoshi Arie, Kunihiro Gotoh |
| Synopsis: A new roller hearth kiln (RHK) has been developed, resulting in both the highest quality and productivity for MnZn ferrites. Using the RHK, the total sintering time is reduced to less than 11 h, that is, a half of the case of the pusher type kiln. The productive capacity of the RHK achieved 100 t/month. Moreover, two different types of MnZn ferrite, i.e., high-permeability and low-power-loss materials, can be sintered simultaneously in the RHK, because the control of oxygen content during the sintering and the subsequent cooling zone is performed precisely. The electromagnetic properties of these materials reach the highest level in mass production. The initial permeability (Κi) of the high-permeability material, MA100, reaches 10 000 at 100 kHz, and the power loss (Pcv) of the low-power-loss material, MB4, is reduced to 270 kWEm(-3) at 100 kHz, 200 mT and 95. |
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