Permanent magnet for loudspeaker and preparation method thereof

Abstract

The invention provides a permanent magnet for a loudspeaker. The permanent magnet is prepared from the following components in percentages by weight: 1.5%-2.5% of neodymium, 2.1%-3.5% of titanium, 3%-7% of boron, 0-3% of yttrium-iron alloy, 1%-8% of kaolin and the balance of ferric oxide. A preparation method thereof comprises the five steps of material mixing, oxidation treatment, static pressure molding, roasting processing and abrasive machining. The permanent magnet is simple in technology, low in production condition requirement and relatively low in raw material cost compared with a traditional magnet, so that the preparation for magnet production can be developed flexibly and efficiently, and the production cost of the magnet is reduced; meanwhile, the density and structural strength of the magnet are effectively improved, the crystallite stability inside the magnet is good, the maximum magnetic energy product is high, and the coercive force of magnetic induction is high, so that the service life of the loudspeaker can be effectively prolonged, the sound quality effect of the loudspeaker is improved, and the quality of the loudspeaker is improved.

Description

technical field [0001] The invention relates to a permanent magnet for a loudspeaker and a preparation method thereof, belonging to the technical field of permanent magnet production. Background technique [0002] In the loudspeaker, the internal permanent magnet is one of the important devices to ensure the working performance of the loudspeaker, so the performance of the magnet directly affects the performance of the loudspeaker, but in actual use, it is found that the magnets used in the current loudspeaker are mostly based on Although magnets made of iron oxide can meet the needs of loudspeakers and have low cost of use and production, the density and structural strength of current iron oxide magnets are relatively small, the stability of the grains inside the magnet is not good, and the maximum magnetic energy product and magnetic induction are limited. The coercive force is low, so after the speaker is used for a long time, the magnetism of the iron oxide magnet decrea...

AI Technical Summary

Problems solved by technology

[0002] In the loudspeaker, the internal permanent magnet is one of the important devices to ensure the working performance of the loudspeaker, so the performance of the magnet directly affects the performance of the loudspeaker, but in actual use, it is found that the magnets used in the current loudspeaker are mostly based on Although magnets made of iron oxide can meet the needs of loudspeakers and have low cost of use and production, the density and structural strength of current iron oxide magnets are relatively small, the stability of the grains inside the magnet is not good, and the maximum magnetic energy product and magnetic induction are limited. The coercive force is low, so after the speaker is used for a long time, the magnetism of the iron oxide magnet decreases significantly and rapidly, which seriously affects the service life and performance of the speaker. In response to this problem, in addition to the development of new magnets based on rare earth materials, Although this kind of magnet can effectively overcome many shortcomings of traditional iron oxide magnets, the production process of rare earth magnets is complicated, and the production cost and raw material cost are high, so the actual use capacity is very limited, so it is urgent to develop a new Magnets for loudspeakers and their preparation process to meet the needs of actual use

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