水噴霧アルニコ粉末の磁気特性に及ぼす熱処理の影響 Effect of Heat-treatment on Magnetic Properties of Water-atomized Alnico Powder
The objective of the present work is to develop plastic bonded Alnico magnet for high-quality electronic display or other applications. Here Alnico powders were produced by water-atomization (W/A) instead of cast-crushing method as usual. When W/A Alnico powder was held in the range 1000-1100K for a few minutes and then aircooled, the magnetic properties was wholly improved: practically, 2%Co- and 24%Co-bearing Alnico powders showed the coercive force (Hcj) of more than 6000e and 9000e, respectively. Subsequently, plastic bonded magnet, when press-compacted, showed the maximum energy products (BH)max : 0.45MGOe for 2%Co and 0.67MGOe for 24%Co (packing factor: approximately 65%). As a whole, W/A Alnico powder is of almost the same magnetic properties and further, is expected to be less costy as compared with cast-crushed one.
粉体および粉末冶金 44(5), 495-500, 1997-05-15
Japan Society of Powder and Powder Metallurgy