Japan sintered NdFeB magnets

Make such an alloy containing neodymium necessary necessary pulverized into fine particles of a first material, forming aggregated particles, and then sintered. Then complete the cut to the desired size. This process always feel like making a cake.

    Of course, high quality neodymium magnet actual production is not so simple. Not only to unify the 3? 5μm particle size, but also pay attention to the uniformity of shape, but also consider thermal sintering method, etc., all need to spend a lot of energy to produce.

    For example, the alloy 3? 5μm to implement Crushing the "magnetic field forming step" is 1. This step is to make the powder (microfossils) pulverized orientation. Here fixing the alignment direction is uniform, the magnetization direction of orientation of the powder is high, the residual magnetic flux density is greater. When implementing the embodiment of the first step of the fine powder is filled into a mold, applying a strong magnetic field to orient the powder, then compression molding process.

    In order to achieve high orientation, the need to establish a magnetic field uniformity in the mold space, which is also very important. Due to the size of the electromagnet and the mold structure, the shape, the material will be non-uniform magnetic field, resulting in poor alignment, it requires the use of a magnetic field analysis means for fine tuning the magnetic field uniformity.

    In the manufacturing problems, because many reports talking about it, neodymium magnet leave China out of the question. This is because the hybrid magnet Dy (dysprosium) have been mined mostly in China, but China has begun to export restrictions. In this limit, dysprosium metal, to reduce market supply, in July 2011 the results of dysprosium metal prices rose to 3100 / kg, up to about 10 times a year ago.

    Why, then, should be limited to Chinese export it? For this problem there are all kinds of speculation, but the Japanese production of neodymium magnets gives the same answer: "The reason is we want to get a neodymium magnet manufacturing technology" Currently, the share of the neodymium magnets are almost monopolized by Japanese companies. And, as mentioned earlier, neodymium magnet production requires a lot of accumulation of technology, and in this regard has already accumulated a Japanese company. In contrast, the Chinese "Although the manufacturing neodymium magnets are indispensable material wealth, but it can not create a better product." Therefore, China showing "just set up factories in China, our professor of manufacturing technology, large supply of exchange of raw materials ", which is a specific policy to restrict the export of products. Of course, more than just the Japanese magnet manufacturer's advice.

    July 2011, "Japanese Economic News" reported that Hitachi Metals decided to neodymium magnets in China. Hitachi Metals is estimated that after the decision in a stable outflow of material procurement and technical risk to make a choice, to ensure that the first purchases.

    However, in China and even the factory, it may not immediately lead to the outflow of technology. On this issue, the process is relatively good Japanese car manufacturer. Japanese carmakers in China in order to sell cars, it is necessary to establish a joint venture with Chinese companies in China. Chinese people can be obtained through joint ventures