Permanent magnet for loudspeaker and preparation method thereof

Abstract

The invention provides a permanent magnet for loudspeaker, each component and the mass ratio between the components are: neodymium 1.5%-2.5%, titanium 2.1%-3.5%, boron 3%-7%, yttrium-iron alloy 0-3%, The kaolin is 1%-8%, and the balance is iron oxide. The preparation method includes five steps of material mixing, oxidation treatment, static pressing, roasting and grinding. The invention has simple process, low requirements on production conditions, and the cost of raw materials is relatively lower than that of traditional magnets, so it can help to carry out the production and preparation of magnets flexibly and efficiently, and help reduce the production cost of magnets. At the same time, it is also effective The magnet density and structural strength are greatly improved, the internal grain stability of the magnet is good, the maximum magnetic energy product is high, and the coercive force of the magnetic induction is strong, which can effectively improve the service life and sound quality of the speaker, and help improve the quality of the speaker .

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...

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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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