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据“Tech Notes”1991年第四期报导,美国Iowa州立大学Ames试验室的冶金师们开发了一项用于制造稀土铁合金的热还原冶炼工艺。这项工艺为制造超级永久磁铁所需的钕-铁合金提供了一项快速、高效、低成本的生产方法。这种磁铁的磁力强度为常规铁氧体磁铁的2倍,目前在美的年销售额为9000万美元,计划在1995年前实现25亿美元。采用这项工艺,一方面可以降低生产成本,提高美国产品与目前统治超级磁铁市场的日本、欧洲产品的竞争力;另一方面可以减小美国对生产永久磁铁所需的进口钐、钴等贵金属的依赖性。
According to Tech Notes, issue 4, 1991, metallurgists at the Ames Laboratory at Iowa State University in the United States have developed a thermal reduction smelting process for the manufacture of rare earth ferroalloys. This process provides a fast, efficient and cost-effective method of producing neodymium-iron alloys for super permanent magnets. The magnetic strength of this kind of magnet is 2 times that of the conventional ferrite magnet. At present, the annual sales volume in the United States is 90 million U.S. dollars and it is planned to realize 2.5 billion U.S. dollars by 1995. Using this process, on the one hand, can reduce production costs and increase the competitiveness of U.S. products with the current Japanese and European products that dominate the super magnet market. On the other hand, it can reduce the import of samarium, cobalt and other precious metals required by the United States for the production of permanent magnets Dependency.