MQ2, 3磁石 : 製造技術と特性の改善

概要

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MQ 2 and MQ 3 magnets with various shapes, e.g., rings, disks and cylinders, have been successfully produced by a newly developed process which employs a cold preform made by compacting crushed melt-spun ribbon. This contrasts with the standard process in which crushed ribbon is hot pressed directly in a die. Advantages of this preform process are that (1) a wider range of part shapes can be prepared, and (2) lubrication can be more effectively applied, improving processibility.MQ 3 magnet can be produced either by 1-heat process similar to the die-upsetting process or by 2-heat process in which a cold MQ 2 preform is reheated and plastically deformed. Choice of the process should be made by the product shape and magnetic property requirements.The effect of a variety of additives on magnetic properties and hot workability was investigated. These results show that a wide range of magnetic properties can be achieved either by a selective additive or by varying the degree of plastic deformation.Detailed explanations are made of magnetic properties at room temperature and at elevated temperatures, long term stability, and corrosion resistances of NEOQUENCH-H (MQ 2) and NEOQUENCH-D (MQ 3).
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