永久磁石材料の進歩
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概要
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There are a number of permanent magnets in the market. Quality improvement of ferrite magnets has been done steadily and it is possible to obtain materials with a remanence of 3600 G coupled with an intrinsic coercivity of 5000 Oe for automobile starter motors.In 1983 permanent magnet manufacturers in USA and Japan announced their intention to produce Nd-Fe-B magnet. It can be produced both by the technique used for rapid quenching and by conventional powder metallurgy. The powder produced by rapid quenching is applied for isotropic plastic bonded magnets which are used for small motors.
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