Alnico 8系焼結磁石の磁性(第3報)

概要

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The magnetic properties of sintered Alnico-8 type permanent magnet were studied. The effects of boron addition, forming pressure, sintering time, the amout of binder, and the cooling time from 1250°C, the solution temperature, to 900°C were investigated. Results obtained were as follows : 1. Magnetic properties were improved by boron, and its optimum content was 0.01-0.02%, less than 0.06% in the Alnico-5 type magnet. 2. The forming pressure (2-8T/cm2) and the amount of binder (0-6%) had little effect on the magnetic properties, but at least 2 hours was necessary at 1250°C. 3. The binder was removed best in vacuum, but the removal in air must be done at the temperature as low as possible below 200°C. In air, the same magnetic properties as those in vacuum were obtained when the binder was at vemoved at 100°C. 4. Rapid cooling from 1250°C to 900°C improved the mangtic properties, and the relation be-tween magnetic properties and the cooling time could be controlled by adding aluminum and silicon adequately.
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