Alnico系磁石合金の鋳造性と磁性におよぼすアルミニウムおよびシリコンの影響

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  • Influence of Aluminium and Silicon on Magnetic Properties and Castability of Alnico Type Permanent Magnet Alloys
  • Alnicoケイ ジシャク ゴウキン ノ チュウゾウセイ ト ジセイ ニ オヨボス アルミニウム オヨビ シリコン ノ エイキョウ

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The fluidity length of Alnico 5 cast alloy in the spiral test increases linearly with the pouring temperature up to about 1510°C and gradually at a higher temperature.<BR>Crystals of the spiral casting of Alnico 5 magnet alloy are generally columnar crystals in the neighbourhood of the sprue, the mixed structure of columnar and equiaxial crystals in the center of a section to approach to the top of flow and fine equiaxial crystals at the top of flow. The columnar crystals are produced easily, by the increase of the pouring temperature, but in case the pouring temperature is just above freezing temperature, the finest equiaxial crystals are produced from sprue to the top of flow.<BR>In order to improve the fluidity, the contents of Al and Si in the Alnico 5 alloy has been changed. Addition of Si reduces the freezing temperature. This fact is one of the reasons that Si addition improves the fluidity and faciliates the formation of columnar crystals. By adding of about 1%Si the fluidity is improved by 10∼15% without rising the pouring temperature, and the magnetic properties equal to or more than the Alnico 5 alloy are obtained. When changed the Al content in the Alnico 5 alloy, the freezing temperature falls and there by the fluidity is slightly improved. But it seems that the fluidity cannot be improved by changing the Al content without a lowering of the magnetic properties.

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  • 日本金属学会誌

    日本金属学会誌 28 (10), 623-627, 1964

    公益社団法人 日本金属学会

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